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CH APTER 8
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Recent Paients on Biotechnology 2012, 6, 69-79 69
Application of Novel Nanotecheology Strategies in P lant Biotransforma- tioiiJ A Contem porary OverviewMehrnaz S. Ohadi Rafsanjani’, Amene Alvari', M. Samim^, M. Amin Hejazi^ and M.Z. Abdin'*
Dept. o f Biotechnology, Faculty o f Science, Jamia Flamdard, New Delhi-62, India; ^Dept. o f Chemistry, Faculty o f Science, Jarnia Hamdard, New Delhi-62, India; ^Dept. o f Agriculture Biotechnology Research Institute o f Iran (ABRII),
Tabriz, Iran
Received: October 1 7, 2011 Revised: December 17, 2011 .Accepted: Jamiary 03, 2012Abstract; During the past epoch we liave gone through the remarkable progress in plant gene traiisfoniiation technology. The production of transgenic plants is considered as a valuable tool in plant research and the technology is eKtensively applied in phytomedicines and agricultural research. Gene transformation in plants is normally carried out by Agrobacterium species, application of some chemicals and physical techniques (electroporation, microprojectile, etc.). Now a days with better efficacy and reproducibility, novel technologies for the direct gene ti'ansfer like liposome, positively charged liposome (lipofectin) and naiioparticle based delivery systems are used for genetic transformation of plants. In this review, we have enlightened the novel nanotechnologies like liposome, Carbon nano-tube and nanoparticles with their current status and future prospects in transgenic plant development. Moreover, we have also highlighted the limitations of conventional techniques of gene transfer. Furtlrermore, we have tried to postulate innovative ideas on the footprints of established nanotechnology and chemical based strategy with improved efficacy, reproducibility and accuracy along with less time consumption.
Keywords; Biotransformation, Nanotechnology, Liposome, Lipofectin, Nanoparticle.
IN TROD UCTION
Plant tissue culture techtiique is an essential tool in agricultural and medicinal plant research. It relies on maintaifiing plattt cells in controlled aseptic condition on a suitable nutrient medium. The culture can be sustained as a mass o f undifferentiated cells for an extended period of time or regenerated into whole plants. For the production o f secondary plant metabolites and regeneration of plant with improved nutritional quality, higher yields and tolerance against biotic and abiotic stresses, new er genes need to be introduced in the preexisting plants with norm al physio and phytochemical properties [1-3]. T ill now tissue culture is grown at a mature level in each respective area o f gene transfer like protoplast fusion [2, 4-6], physical method (electroporation, particle bom bardm ent, micro-injection, etc.), direct gene transfer techniqites (protoplast fusion, transfection), gene transfer using plasma membrane destabilizing/precipitating agents (chemicals that facilitate the gene transfer through the cell membrane, for example, polyethylene glycol 6000, polyvinyl alcohol, NaNOa, DEAE, Dextran, DMSO) [7-14] and natural means o f gene transfer &uch as the use o f Agrobacterium species [15 , 16].
Although these conventional m ethods are effective in gene transfer, but their effectiveness and efficiency are compromised over the rapidity as the application o f excessive energy in physical m ethods as w ell as the excess chemicals utilized in chemical m ethods damage the DNA and cells [6 ],
Encapsulation o f gene into biocom patible carriers is expected to enhance the biotransformation process and related outcomes by providing protection to the cell, gene and enzymes.
‘Address Coriespending to this Author at the Dept, of Biotechnology, Faculty of Science, Jamia Hamdard, New Delhi-62, India;Tel: +91-9818462060; E-mail: [email protected]
Based on this, currently new era o f novel nanotechnology based carriers like liposome, m odified positively charged liposome, inorganic nanoparticles, carbon nano-tnbe and Quantum dot etc. were successfully adopted as main or adjuvant technologies in genetic transformation. N um erous reports published in recent tim es are indicative o f significant contributions o f these novel technologies in gene transfer to the plant tissues and their culture techniques. In this review, we are discussing in detail about the liposomes and nanopar- dcles as novel nanotechnology based biotransformation systems for gene deliveiy in plants. M oreover, wc will also describe in brief about com m only used gene transfer approaches and their limitations. A dditionally, we w ill try to postulate innovative ideas on the footprints o f estabhshed nanotechnology and chemical based strategy for im proved efficiency, reproducibility and accuracy o f bioiransforma- tion.
C O N V E N T IO N A L B IO T R A N S F O R M A T IO N N O L O G IE S IN PLA N TS
T E C H -
Plant biotransformation vectors and m ethodologies have been im proved with the time to increase the effectiveness o f biotransfonnation and achieve stable expression o f transgenes, Currently available biotransform ation m ethods can be divided into two inain groups: indirect and direct biotransform ation method. The indirect m ethod is based on the in troduction of a plasm id-canying gene construct into the target cell [15, 16], The m ost com m only applied indirect m ethod is Agrobacterium tumefaciens or Agrobacterium rhizogenes based gene transfer in w hich the xmlque natural ability o f Agrobacterium is utilized to precisely transfer specific DNA sequences to cells [17-27]. Im portant events o f T-DNA transfer and components involved in the Agrobacterium mediated gene transfer are outlined in Fig. (1). Agro- bacteriiim-haseA DNA transform ation offers m any unique advantages: (1) precise integration o f DNA sequences with
1872-2083/12 SIOO.OO+.OO © 2012 Bentham Science Publishers
70 Recent Patents on Biotechnology 2012, Vol. 6, No. I Ohadi et al.
V in ilen te pvoteisi P In iU C e l l
Irian-iporter C'lianiiel
jVucleiis
M tto c lio n rtr iii
Bactei’in! C lii’omciQinesChloroplnst
Fig. (1). Diagrammatic presentation of Agrohacterium mediated gene transfer in higher plants.
defined etid, (2) transfer o f desired DNA along with the marker gene, (3) high frequency o f stable and intact gene transfer, (4) low rate o f transgene silencing, and (5) the ability to transfer long stretches of T-D NA (> 150 kb) [20].
Although, Agrobacterium m ediated gene transfer is a commonly used technique with uniqueness, but it has several drawbacks [18. 20, 22-25], These include;
a) Hmitation to carry limited size base pair (<500kb) [25 ],b) chances o f transgene silencing,c) poor gene transfer efficiency,
To improve the efficiency o f Agrohacterium m ediated gene transfer, newer modifications in indirect methods (e.g. application o f acetosyringone) have been applied [20], Further advances were made while developing transgenic plants devoid o f antibiotic rnarker genes, co-transformation o f m ultiple T-DNAs, site-specific recom bination strategies and deployment of Ac/Ds-based transposition tliat helped in the elimi- natioti of marker genes in transgenic plants [20,22,25-27].
PHYSICAL M ETH O D S
Electroporation of In ta c t P lan t C ell and Tissue
Protocols for the electroporation o f cell suspensions have been worked out for many species, e.g. tobacco, rice and wheat. So far, however the best results have been obtained for maize [28]. The efficiency of electroporation was found to be relatively high in this case and 90 transgenic plants were regenerated from 1440 embryos (6.25%) and 31 plants from 55 calli (54.6%) in a study conducted by To et al. [29], which is fully comparable with the best results obtained for this species after micro bom bardm ent [28, 29-30]. Similar fesults were obtained for maize by other investigator on 445
transgenic cell lines selected from 24m l packed cell volume (PCV) [31]. Modifications in electroporation such as post pulse addition o f ascorbic acid or ascorbate could significantly increase the efficiency o f process without having any negative influence on cell viability [32], Although electroporation seems to be a simple and effective method, but its ap plication is lim ited to only few species. In addition, application o f electric current dam ages the gene leading to m isleading codons and w rong translational end product [2 9 ,3 3 ,3 4 ],
MicroinjectionIn case of microinjection, D N A is directly injected into
plant protoplasts or cells (specifically into the micleus or cytoplasm) using fine tip o f 0 .5-1,0 m icrometre diam eter made up of glass needle or micropipette. This method o f gene transfer is used to introduce D N A into large cells such as oocytes and the early em biyonic stage [34, 35-38],
Silicon C arb ide-M ediated T ran sfo rm atio n (SC M T )
In this technique, silicon carbide fibres are simply added to a suspension, containing both plant tissue and the plasm id DNA, It is then rigorously mixed so that DNA-coated, fibres penetrate the cell wall [34], A lthough SCM T approach is easy, fast and economical m ethod that is applicable to various plants but this methodology have disadvantages like low transformation efficiency, damage to cells that negatively influence their further regeneration capability, and the necessity o f taking extraordinarily rigorous precautions during kib w ork as breathing the fibres in, especially asbestos ones, can lead to serious sicknesses [34, 39, 40], M oreover, the efficiency o f SCMT is affected by various variables like fibre size, vortexing, shape o f the vessels used, plant m aterial and
Application o f Novel Nanotechnology Strategies in Plant Biotransformation Recent Patents on Biotechnology 2012, Vol. 6, No, I 71
the characteristics o f the plant cells (particularly the thickness o f the cell wall) [41],
T em perature M ediated Gene T ran sfe r
Elevation in temperature enhances the gene transfer that is successfolly adopted and conformed to animal cell transfection process [42|. It seems from the literature that at tem perature above 37"C, the gene transfer tendency gets increased and further rise in ambient temperature to 43°C with certain period o f time provided greater transient transfection. This is confirmed by work on interleukin-2 and swine growth hormone expressions using indirect FiLISA [43, 44],
Based on the above concept Dillen et al. in the year 1997 worked on the effect o f temperature on Agrobacterium tiiine- faciem-mediiiied gene transfer in plant [45], They reported the effect of temperature (15°C-29°C) in biotransformation process with A. tuinefaciens involved in co-cultivation of Phaseolus acutifolhis and further in Nicotiana tabacum biotTcinsformation [45], In both the situations, iiTespective of the type of helper plasmid, the level o f transient uidA expression decreased notably when the temperature was raised above 22°C, further lowered dow n in temperature at 27°C and was undetectable at 29°C [45, 45]. Coiiamonly used conventional method o f biotransformation discussed here is suminarized in Table I along w ith their advantage, mechanism of gene transfer and limitations.
NEED O F N A N O T E C H N O L O G Y A PPR O A C H
Particles/globules having the size range of 1-lOOOnm are considered as nanoparticle or nano vesicle nanocarriers [47, 48], The small size with unique surface and bulk properties have made them versatile carriers for bioactives and genes.
Direct and indirect physical biotransfom iation processes commonly suffer from instability o f gene in the environment, deletion of gene due to the high energy impact, poor penetration and reproducibility. Literature revealed that the process o f nanotechnology based gene transfer in plant seems to be slower but nanotechnology is expected to provide numerous benefits when utilized in biotransfomiation;
a) comparatively faster mode o f gene transfer than the Agrobacterium based biotransfonnation,
b) DNA is protected due to encapsulation and effectively transformed in controlled manner,
c) the probability o f energy induced DNA damage related gene mutation (commonly seen in case o f physical methods) is very much reduced, and
d) nanotechnology approaches are also easily amalgamated with physical methods leading to effective and improved gene transfer [48],
Till date in plant biotransformation process, liposome, modified liposome, lipofectin, nanoparticles, carbon nano- lube, and quantum dots have been reported as gene carrier [48], Although, very few nanotechnology based methods have been reported so far in biotransfoxniation, but they seems to be effective in terms o f time consumption and DNA protection during transfonnation process. Furthennore, use
of nano-formulations encapsulated gene with other physical methods like electroporation, microinjection and m icropro- jectile bom bardm ent technique may enhances the gene transfer efficacy with integrity o f DNA. In plants, liposomes and nanoparticles were successfully adopted as an adjuvant w ith physical methods as common nano-approaches. Likewise, with some strategic modification in nano-approaches, they can directly be adopted as the sole biotransfom iation method,
Liposom e M ediated G ene Transsfer
Liposomes are colloidal, vesicular structures consisting of one or nrore lipid bilayers that sruTound an equal num bers o f aqueous compartments [48-49], Due to the presence o f aqueous core and lipophilic vesicle structure, the plasmid/ gene is expected to be encapsulated in aqueous environment. Liposomal gene transfer technique has been successfully tried and adopted in gene delivery as the novel technique [50],
Gene loaded liposomes provide numerous advantages;
1 ) providing stability to gene,
2) diminish or reduce the deletion in the DNA, while used along with the physical techniques,
3) control release pattern o f gene delivery,
4) surface modification o f liposome (positively charged) potentiate the penetration within a cell,
5) show higher degree o f reproducibility,
6 ) applicable to a wide range o f cell types, and
7) free from cellular toxicity.
In this technique, the m echanism o f D NA entry through the protoplast seems to be mediated by endocytosis process o f liposome by the cells [48], which may involve the following steps:
1 ) adhesion o f the liposomes to the protoplast surface,
2 ) fusion o f liposomes at the site o f adhesion,
3) formation o f endosome w ithin the cytoplasm, and
4) release o f plasmids inside the cell.
The liposomal technique has been successfully used to deliver DNA into the protoplasts o f a num ber o f p lant species (e.g. tobacco, petunia, carrot, etc.) [50]. Possible m echanism o f gene transfer in plant by liposome is illustrated in Fig. (2).
First time, in the year 1985 Deshayes et al. developed positively charged liposomes bearing EschericM a coll plasmid (pLGV23neo) carrying a kanaiiiycin resistance gene, used in transgenic tobacco development. Protoplasts isolated from their leaves were resistant to 1 0 0 m icrogram s/m l ka- namycin [50],
Later in the year 1987, Caboche et al. prepared plasmid vector pUCSCaM VCAT with CA T gene (chloram phenicol acetyl transferase) encapsulated unilam ellar liposom al vesicle, and successfully tried to introduce gene in tobacco protoplast. They also reported that introduction o f
Table t. Summarized Features, Mechanisms of Gene Transfer and Limitations of Conventional Biotrarisforination Methods
72 Recent Falenis on Biotechnology 2012, Vol. 6, No. 1 Ohadi et al.
Methods Features Mechani,siri Limitations
Physical Methods
Elactropofation
Electrical impulse (1.2kVolt/s) through the suspension of protoplast in the solution con
taining DNA resulting in gene transfer.
The process is rapid and sjjecialized vcctors are not needed.
Useful for high-efticiency transient expression of foreign genes,
In plants, sometime, selectable marker is not needed.
Poorly understood, but probably the electrical impulse enhance the pore size for passive diffusion. In addi
tion, development of elcctricai giadient potentiate.s the iiitra cellu
lar transport of DNA.
Frequency of stable trausfortuation is low (0.001 or less). Nonnally the
transformed DNA i.s cKtensivcIy reananged leading to mitotic and
meiotie instability.Can be only used with protoplasts.
Probability of deletion is high.Application is limited to only few
species.
Microprojectile/ Panicle bombardment/
Biolistic
DNA coated gold particles are bombarded over the cells, tissues or whole plants.
More stable transfomiation possibility. Vectors are not required
Applicable to wide range of plants. Applicable with other methods that are needed
for tissue culture.Highly efficient.
Forced bombardment of small gold particles directly introduce gene into the cells through reversible
penetration. Fomiation of passive diffusion pores is also probably the
reason.
The transformed DNA is highly rearranged leading to mitotic and
meiotie instability.Amenable tissue cul
ture/regeneration systems caniTot completely he eliminated.
The transformed cells survival rate is decreased because of high mem
brane damage.
Micro injectio u
The f)NA is directly injected into plant protoplasts or cells using fine tipped glass needle or
niioropipette.Suitable for gene introduction in large cells.
Effective gene transfer to the nucleus is easy.
Direct introduction of gene by penetrating the cellular membrane,
Not suitable for small cells or tis- ,sues.
Infrequent gene transfer method in plant biotransformation.
Efficiency is low.Suitable for large animal cells.
Temperature mediated gene transfer
Under the influence of temperature protoplasts fuse together or gene transformed into the cells.
Method is economical and easy to adopt.
At elevated temperature and enhanced randomization, formation
of pores due to the lipid fluidization.
Only used for experimeiital purpose.
Infi'equent use.
Only bo adopted with protoplast. Slow and less efficient process.
With the intention for rapid biotransformation, enhanced temperature damage the nucleic acid
and cells.
Co-pracipitationDivalent metals (Ca, Mg) and DNA
co-precipitates when formed at cell surfaces, they can be taken up by cells.
-
Wall-less cells are amenable to biotransformation through co-
precipitation.Mitotic and meiotie instability may
occur.
Micromanipulation
Single-cell technique.
Features similar to biolistic method.An excellent tool for specific transient expres
sion studies.
Similar to biolistic method.
Little use for stable transformation of plants.
Other limitations similar to biolistic method
Chemical Method
Protoplast fiision/gene ti-ansfer is carried out by fusagens/plasma membrane destabilizing/ pre
cipitating agents (eg. PEG, PVA, Dextran, etc.).
Process is rapid- and highly efficient
Fusion of protop last/cells under the influence of their charge interaction.
Surfactant like behavior enhances the cellular permeation.
Damage of cellular components and gene itseif
Only is applicable in case of protoplasts. The regeneration of trans
formed protoplasts is veiy difficult, which lowers (he transfomtacion
frequency.
Application of Novel Nanotechnology Strategies in Plant liiotramformation Recent Patents on Biotechnology 2012, Vol. 6, No, I 73
(Tiibie 1) coutd....
Methods Features Mechanism Limitations
Biological Methods
Agrobactcrium mediateU Iraitsfannation
Natural ability oi' Agvohacterium is utilized in which Ti plasmid of the liacteria containing gene of interest transforni the plant.
Simple technique.
The transformed cells are fairly stable for mitotic and nieiotic process.
Large loading capacity in teniis of foreign DNA size.
Easy to adopt in large number of plant species,
Adaptable to different types of cell, tissues, cultures and non-culture techniques.
Biotransformation occur in following steps:
1) precisc integration of DNA sequences with defined end, 2) transfer o f desired DNA along with the selection marker, 3) high frequency of stable and intact gene transfer, 4) low rate of transgene silencing, 5) The ability to transfer long stretches ofT-DNA,
Host range is limited; to dicot plants.
With vulnerable plants, accessible culture systems must be adapted.
Chances of tran.sgetie silencing.
Poor gene transfer efficiency.
Virus mediated transformation
Plant’s virus ability to express foreign gene is utilized.
Potentially useful for transient and whole-plant expression.
Independent of host range limitation.
Host cell mediated endocytosis. Moreover, lysogenesis process by
virus cannot be ruled out.
Non selectivity.
Slow process.
Low DNA size carrying capacity.
Endosome fomiation leading to endocytosis
Fig. (2 ). Illustration of possible means of gene transfer in plants by liposomes indicating the probable steps.
74 Recent Patents on Biotechnology 2012, Vol. 6, No. I O/tiU/i e( id.
polylysine into the media increases the penetration o f encapsulated gene conjugate, that is probably due to the introdiic- tion of positive charge over the liposome surface that can be easily adsorbed over the negatively charged cellular membrane surface. In addition, the reports also disclosed that the CAT gene expression efficiency was decreased [51].
The reasons behind such responses were not explored by Caboche et a i, but the probable reasons behind decreased CAT gene expression possibly are as follows;
a) entire vesicular liposomal form may enter info the cell due to endocytosis process,
b) inside the cytoplasm, liposome release the encapsulated gene not at a time but in controlled manner, which is a property o f vesicular system, and
c) due to the fusion process, the surface adheres liposome fused with the membrane and released the core content.
Caboche e/ al further worked on tlie liposomal mediated gene transfer that was corroborative to their earlier work[52]. Balias et al. formulated tobacco mosaic vims RNA {TMV RNA) encapsulated liposome that was made up o f phospholipid (Phosphatidylcholine) and cholesterol [53]. The developed liposomes were further surface fnnctionaiized by introducing hydroxy] group over liposomal lipid layer by using a quaternary ammonium detergent, di-isobutyl cresoxyethoxyethyl dimethyl benzylaramonium (DEBDA [OT-r]). This enables the functional transfer o f TISW RNA within small span o f time (48h) into tobacco and petunia protoplasts [53].
They proposed two alternative modes thorough which the ti'ansfomiation process o c c u r r e d ; d u e to the presence o f cationic detergent, the liposomal surface gets positive charge. Incubation of positively charged liposomes witb plant protoplasts resulted in transfer o f the enclosed RNA. Second, biotransfomiation may also be enhanced by complex formation between the surfactant present over the surface o f liposome and externally added TMV-RNA. The result further supported by the experimental outcome that showed liposomes lacking the quaternaiy ammonium detergent failed to transfer TMV-RNA into tobacco and petunia protoplasts[53].
Recently, Caboche worked on liposome mediated transfer o f nucleic acids in plant protoplasts and reported the spontaneous interaction between liposome and surface o f protoplast, Caboche developed and characterized stable transfomiants expressing kanamycin resistance gene by hybridization technique and progeny analysis [52].
IVfodification in Liposom al Technique
Wiesnian et al., in the year 2007 synthesized novel cationic amphiphilic compounds from vemonia oil (a natural epoxidized triglyceride) and further utilized the same in the preparation o f liposomes that were able to encapsulate DNA[54], The developed liposomes have positive chai'ge on vesicle surface as well as excellent stability due to charge equilibrium provided by ampiphilic compound [54].
The ampiphilic compound based liposome was characterized for surface morphology and vesicular size by TEM , SEM, AFM and confocal laser systems that showed the spherical shape with diameters between 40 and 110 nm [54], Liposomes were able to encapsulate a condensed 5.2kb plasmid (p.rD328) and showed interaction and crossed cuticle membrane in intact form. In addition, deliveiy rate of encapsulated radio-labelled 2,4-D (2,4-dichloropenoxy acetic acid) obtained with these vesicles was greater as compared to liposomes prepared from dipalmiloyl phosphatidyl choline (DPPC) and the control (un-encapsulated 2,4-D). The obtained result clearly indicates the significance of positive charge over the liposomal surface introduced by ampiphilic compound used in the preparation
N anoparticle
Nanoparticles are now established under the new era of medicine called as nanornedicine. Particularly in oncology, Doxil® and Abrexan® are commercially established nanomedicines for the treatment of breast cancer. In addition, different nanoparticulate delivery carriers like polym eric nanoparticle, metallic nanoparticle and quantum dots have also been successfully adopted by scientists in gene therapy as a gene carrier [47, 55-56].
In plant biotechnology, nanoparticle as a gene carrier in biotransformation process could protect DNA damage from ultra sound as reported by Liu et al., with liposomal form, thus it is easily coupled w ith physical method of gene transfer. Liu et al. in their study used green fluorescence protein (GFP) tagged with nanoparticle to demonstrate its effectiveness and reported that nanoparticle alone goes into the cytoplasm as seen in green cytoplasmic content [57], W hile coupled with physical method o f gene transfer (rdtrasound), it exhibited dramatically increased fluorescence, indicating the pIRGFP plasmid DNA-PLL-StNP complexes were transferred into COS’’ cells mediated by ultrasound [57]. They successflilly developed surface-functionalized silicananoparticles resembling to honey comb mesoporous form with the pore size of 3nm that can transport DNA into isolated plant cells and intact leaves. They also developed capped and uncapped gold nanoparticles and reported that uncapped particles released the chemicals and triggered gene expression in the plant under controlled-release condition. Working in the same area, Jun et a l, (2005) developed starch nanoparticles by water/oil micro-emulsion technique [58], The developed nanoparticles were coated w ith poly-Z,- lysine to induce negative surface charge and their surfaces were coupled with fluorescent molecule Ru(bpy)3^^ 6 H2 0 . It has been found that plasmid DNA coupled with nanoparticle successfully transformed the plant suspension cells of Dio- screa zigiberensis with significant reduction in the incubation time for transformation even under the influence o f ultrasound and Dnase I [58], They also tried to explore the influence o f particle size on the biotransformation. Fluorescence starch-nanoparticles with the size 50-100 nm effectively crossed the cell wall, plasma membrane and nuclear membrane. This nano-biomaterial can efficiently solve the problem that exterior genes cannot traverse the plant cellTT7o1T
Applkation o f Novel Nanotechnology Strategies in Plant Biotransfonnmion Becmt Patents on Biotechnology 2012, Vol. 6, No, I 75
Carbon Naiiotubes
Carbon nanotubes have fascinated scientists with their extraordinary properties. These nano-materials have become increasingly popular in various fields simply because o f their small size and amazing optical, electric and magnetic properties when used alone or with additions o f metals [47]. Recently, it has been reported that rice cells suspension (Oiyza .sativa L.) cultured with multiwall carbon nanotubes (MWCNTs) increased reactive oxygen species (ROS) and decreased cell viability [59], As reported in case of carbon nanotube exposure on cell cuUru’e, it seems that cell wall undergoes hyposensitive response due to ROS defence response [59].
LipoFcctiii
Lipofectins are cationic liposomes capable o f gene transfer in plant cell line. Sawahel (2002) reported that lipofectin effectively transfuse the mesophyll protoplast of Nicotiana tabacum and N. phanbaginifolia [60, 61], They reported that the transfonnation efficacy of B-glucoronidase gene under the control o f CaMV-35S promoter was lower than the PEiG mediated gene transfer. Advantage with the use of lipofectin in biotransformation is similar to that of liposome with additional advantage o f stably transformed plants with or without additional application of electi'oporation [61].
FUTURE PRO SPECTS
On ground of earlier reports that revealed the application of liposomal and nanoparticle based gene transfer, various mechanistic ideas can be postulated to improve the efficacy of this novel non viral gene protected biotransformation approach- Adaptation o f physiochemical properties of nanocar
riers, protoplast and plasm a membrane may significantly improve the liposomal and nanoparticle encapsulated gene into the plant cell and establishing these gene transfer m ethods as sole process rather than adjuvant [62], Some of the approaches to improve nanoparticles based gene delivery into plant cells are given below:
a) It is a well-known fact that protoplast and plasma m em brane negative surface charge and their surface potential vary from -lOmV to -30mV [62], This surface charge can be utilized for the enhanced adhesion of encapsulated DNA, if we introduce positive charge over their surface. This idea is successfully tried earlier by some investigators [54].
b) The pore size or cellular gap in protoplast is 0 .Inm - 5000nm [63]. fn addition the pore size in plasma rnein- brane also varies between Inm to 50nm [63]. Size based penetration enhancement o f nanomaterial is possible in this case as it is reported that the size o f such carriers varied from lOnm to lOOOnm [64].
c) Straylamine, triethylamine and natural biodegradable polymers like chitosan can easily functionalize liposomal or nanomaterial surface with positive charge [65].
Amalgamation of these mechanisms with nanoparticles is presented in simplified manner in Fig. (3). These scientific methodologies may open the way for further development o f efficient plant transformation. The recent patents and patent applications US patent application 20110065092 A1 (gene encapsulated non-viral particle) and US6534484 (gene encapsulated liposome for bio transformation) signify the im portance and strength o f this novel technology in biotransformation. Some more patents assigned to nanotechnology based biotransformation are enlisted in Table 2.
CONCLUSION
In conclusion, efficient transformation o f plants with transgenes encapsulated in nanocarriers is relatively the new area in plant biotechnology. Till now, liposomes have been explored and other nanotechnologies (nanoparticle, carbon nano-tiibe, quantum dots, nanoemuision, etc.) will definitely be used as they were successfully explored in animal biotechnology. Although nanotechnology based biotransforma
76 Recent Patents on Biotechnology 2012, Vol. 6, No. I
tion is relatively efficient, its combination with commonly applied approaches in transgenic plant development will surely improve in terms o f efficiency and productivity, and the chances o f transgene silencing can also be minimized. The mechanism of biotransformation in nanotechnology is still not clearly understood, but the possible role o f endocy- tosis process as well as transcellular and paracellular transport of the nanocarriers encapsulated transgene cannot be ruled out.
Ohadi et at.
' ' ' K ’h
MM
si
A
R
Fig. (4). Diagrams of nanotechnology based gene carriers studied in plant biotechnology (A. Liposome, B. Carbon nano-tube, C. Ncmopariicle).
Table 2. Summary of Patents Sanctioned in the Area of Biotransformation by Means of Conventional and Novel Nanoteclinology
Pafcnl No Title Publication Date Refcrcnce.?
Conventional biotramfnrmation method
W02011064259A1 Method for isolating an alkanol from an aqueous biotransformation mixture 2011-06-03 1661
W02011042143A1 Cytochrome p450 from rhizopus oiyzae and uses thereof 2011-04-14 [67]
W02011008231A3 Biotransformation using genetically modified Candida 2011-06-16 [6S]
DE102009051687A1 Verwendung von Alginit als Reaktionsadditiv bei Biotransformationen 2011-04-28 mUS20110033904A1 Method for preparing orthodihydroxyisoflavones asing a biotransfonnation system 2011-02-10 [70]
US7943356 Alcohol dehydrogenase for tlie stereoselective production of hydroxy compounds 2011-05-17 [71]
EP2366293A1 Taste and flavour modulation by biotransfonnation in raiifc products 2011-09-21 [72]
EP2348107A2 Method for preparing evolved micro-organisms, enabling the creation or modification of metabolic pathways
2011-07-27 [73]
US7846659 Arrays of nucleic acid probes for analysing biotransfonnation genes 2010-12-07 174]
Novel Nanotechnology based bio transformation
US7915450 Transfection reagents 2011-03-29 [75]
US2011006509 2A1 Use of nonviable particles comprising an internal control (IC) nucleic acid 2011-03-17 [76]
US8021686 Lipid-encapsulated poly-5nionic nucleic acid 2011-07-19 [77]
AppUcaiion o f Novel Nanotechnology Strategies in Plant Biotmnsfonnation
(Table 2) conlcl....
liecent Patents on Bioiechnology 2012, Vol 6, No. 1 77
Patent No Title I’ubliciUion Date Refftrcnces
Novel Nanotechnology based biotransfonnation
US4394448 Method of inserting DNA into living cells 1983-06-19 [78]
US5264618 Cationic lipids for intracellular delivery of biologically active molecules 1993-1 1-23 [79]
US.'i 976567 Lipid-nucleic acid particles prepared via a hydrophobic lipid-nucleic acid complex intermediate and use for gene transfer
200B-11-02 [80]
US65344S4 Methods for encapsulating plasmids in lipid bilayers 2003-18-03 [SI]
CA274!918(A1) T-DNA/protein nano-complexes for plant ti-ansformation 2 0 1 1 - 1 2 -0 2 [82]
US20I 1203013 (Al) Delivering compositions of interest to plant cells 2011-08-18 [83]
W02011016053 (Al) DNA loaded supported gold nanoparticles, process for the preparation and use thereof 2 0 1 1 - 0 2 - 1 0 [84]
W02007050715 (A2) Compositions and methods for safe delivety of biologically-acti vc plant transforfflation agents using non-fibrous silicon carbide powder 2007-05-03 [85]
A C ™ O W L EI>G E M EN T
Centre for Transgenic Development, Dept, of Biotechnology and University library, Jatnia Hamdard University, New Delhi'62 are conceded for providing the adequate facilities for the completion o f the work. The authors are also thatikful to Dr. Saleem Javed, Associate professor in the Department of Biocheinistry, Jamia Hamdard for his critical evaluation of the manuscript.
CONFLICT O F IN T ER EST
Authors declare no conflict o f interest.
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Recant Patents on Biotechnology 2011, 5, 227-234 227
In Vitro Propagation of Cichorium intybus L» and Quantificatioo of Enhanced Secondary Metabolite (EsciiUn)
Mehrnaz S. Ohadi Rafsanjani*, Ainene Alvari^” Anis Mohammad’, M.Z. Abdin’ and M.A. Hejazi^
'Department o f Biotechnology, Faculty o f Science, Jamia Hamdard University, New Delhi-62, India; ^Agriculture Bio- lechnology Research Institute o f Iran (ABRII) Tabriz, Iran
Received: July 05, 20IJ Rcviaed: July 25, 201J Accepted: August 10, 20! 1A bstract: In this report, rapid and effective slioot as well as root regeneration system through direct multiplication was successfully developed for Cichorium intybus L. Furthermore, the effect o f exogenous growth regulators (TDZ and lAA) at different concenb-atiojis on the regulation process o f the plant was also studied. Enhanced production o f esculin in d eveloped C. iiuyhus L. was evaluated using leaf extract. Only on the expense of 20 days, regeneration was seen and very low dose o f TDZ was seen to be more effective. When 0.02mg/L o f TDZ was combined with 1.5mg/L o f lAA, nearly 100% of explants produced shoots with the highest number o f regenerated shoots (85.37). With further increase in con ' centration (>0.05rng/L), the number of shoots per explants get decreased. A lower NAA to IB A ratio (1 .Omg/L o f IFiA and 0.5mg/L o f NAA) seemed to be more effective for root generation and considered to be the most effective combination among the tried groups. IBA was more effective in root development than NAA, but both were comparatively effective.On quantitative analysis by RP-HPLC, the 76.23% of Esculin were found in leaf extract o f the in vitro developed C. intybus L. This amount was 26.77% higher than normal grown plants.
Keywords: Cichorium intybus L, TDZ, lAA, IBA, NAA, in-vitro propagation, Esculin extraction, HPLC.
IN T R O D U C T IO N
Plants are major sources o f natural products used as medicinal and pharmaceutical additives, pesticides, flavor and fragrance ingredients. The search for new plant derived chemicals for the welfare o f human being through medicinal atid agricultiu'al values should be a priority in current and future efforts toward sustainable conservation and rational utilization o f biodiversity. In the search of alternatives for production o f desirable medicinal compounds in higher amount from plants and regeneration/production of disease resistant herbal drugs, plant tissue culture technique, well known biotechnological approaches, are found to has potential as a supplement to traditional agriculture in the industrial production. Plant tissue culture technique have been suggested as well established tool for the production o f useful secondai7 metabolites.
Recently assigned patents related to tissue culture are summarized in Table 1. US 20080160615 described about in-vitro propagation o f flavonoid-rich tissue from Neomarica gracilis having antitumor activity, which alters flavonoid content of TV. gracilis. US 20080160560 assigned for in vitro resveratrol-rich callus tissue development derived from Vitis thunbergii Sieb. et Zucc. induced in a tissue culture system containing one or more plant growth regulators; useftil for callus induction and producing resveratrol. US 20080152630 discloses the method for generating tissue’s cells in culture.
*Address con'espondence to this author at the Centre for Transgenic Plant Deveiopinent, Department of Biotechnology, Faculty of Science, Jainia Hamdard University, New Delhi'62, India; Tel: +91-981S462060;E-mail: [email protected]
JP2008106064 is u seM plant tissue culture concerning research outcome ascribed about enhanced production o f tissue plasminogen activator as secondary metabolite from Bacillus natto culture solution EP1962875A4. Obtaining pharmaceutical, nutraceutical, functional food, or cosmetic composition for treating inflammation or autoimmune diseases (e.g. asthma), by extrticting chicoi^ extract [1-5, 8 ],
These patents signify the potential and future directions in plant tissue culture and plant regeneration technology.
Thus, using this technology, therapeutically active bioconstituents as secondary metabolite can be produced under controlled and reproducible conditions, independent of geographical and climatic factors. Cichorium intybus L., com monly known as chicory or kasni (in Hindi) is a medicinally important plant that belongs to the family Asteraceae. This herbal drug has been implemented in folk medicine in A frica, South Asia for several hundred years, Almost evety part o f this species has been used as ethnomedicines. The tuberous root of this plant contains medicinally important bioactives such as inulin, bitter sesquiterpene lactones, coumarins, flavonoids and vitamins [9]. In addition, chicory leaves contain esculin as dominant component which is a well-known natural UV protective agent and one of the phytomedicine used for the treatment o f various peripheral vascular disorders [10,11]. Furthermore, the plant is also used in the treatment o f AIDS, cancer, diabetes, dysmenor-rhoea, impotence, insomnia, splenitis and tachycardia [12]. Inulin obtained, from this plant is used to replace fat or sugar and to reduce the calories o f food. Antidiabetic activity is also
1872-2083/11 SIOO.OO+.OO © 2011 Bentham Science Publishers
Table 1. Some Examples of Patent Application in Plant Tissue Culture Applied to and Assigned by Different Goveniment
228 Recml Patents on Biotechnology 2011, Vol. 5, No. 3 0/uuli et iil.
PatentNumber
Inventor A.s.signee TitlePriority
ApplicationDate
PublicationDate References
US20080160615
Clu! T, Ho CTatung company
and Tatimg University
Flavoiioids-rich tis.sues from Neomaiica gracilis and methods for
culturing the same12/29/2006 7/3/2008 [1]
US20080160560
Ho C, Kuo HHo, Chin-Wen
Kuo, Hsieii-Shen
In vitro resvi>ralroI-rich callus tissues derived from vitis thimbergii
Sieb.et Zncc and method for producing the same
1/3/2007 7/3/2008 [2]
US200s0 i52630
Ghiis, Irene Schwartz, Aharon
Shinar, Doron Shirvaii, Mitchell
Ginis r,Schwartz A,Shinar D, Shirvan M
Method of generation and expansion oftissne-progenitor calls and mature tissue cells from intact hone marrow
or intact umhiliccd cord tissue
12/7/2006 6/26/2008 [31
WO2008068776
Deshpaude Mani- sha S ,Rao Sith-
amraju H, Wangi- kar Pralhad B,
Kuchroo Pushpa
Reliance life sciences Pvt Ltd
Three dimensional tissue equivalent using macromass cidture 12/g/2006 6/ 11/200s m
JP2008106064
Sumi Y Honda Trading K.K (Tokyo), Sumi Y
An enhancer of tissue plasminogen activatorproduced by heat processing Bacillus natto culture solution: useful as a pharmaceutical or foodstuff fir preventing thrombotic dis
eases
9/28/2006 5/8/2008 [5]
CN101152580
LuH Lii HI, Wang X
A tissue-engineered skin manufacturing methodinvolving obtaining skin tissue, confecting anepidermal stem suspension with a specijiedconcen- tration, adding epidermal stem cells
into atissuc culture medium and carrying the cell viasubmerged cul
ture
9/13/2007 4/2/2008 [6]
JP2008086509
Muiiakata M, Tajima K., Tsu-
chiya Y
Sun Medical KK (Morioka, Japan)
A composition for regenerating pcriodorrtal-tissiie (e.g., gum) comprising a culture medium having
aceil suspension of human periodontal membranepositioned on the upper region and a chemotaxissuh-
stance blended on the lower region of the medium
9/29/2006 4/17/2008 [7]
EPI962875A4
Christophe R ;
Barbara S; Ilic Nebojsa i;
Ilya I "
UNIV RUTGERS
United States of America
In vitro and in vivo antiinflammatory effects of a sesquiterpene lactone extract from chicory
(Cichoriiim Intybus L.)
2006-10-11 2011-01-05 [8]
reported [13] and an iniilin clearance test is used to measure glomerular filtration rate-GFR [14]. Recent pharmacological investigation o f the root extract o f this plant revealed immune modulator, anti tumor and anticancer properties [15, 16 ],
Recently, esculin has also been reported as having hepa- toprotection action against CCI4 induced hepatotoxicity [17]. Till this date, there is no established synthetic drag in the
market with dedicated hepatoprotective activity. So, there has been considerable interest in creating an economically feasible biotechnological approach using plant tissue culture for the production of hepatoprotective bioactives like inulin, bitter sesquiterpene lactones, coumarins, flavonoids, v itamins and esculin fom i C. intybus. So, the aim of this sttidy was to perform the in vitro propagation of C. intybus and
evaluation o f total hepatoprotective esculin content in in vitro derived C. intybus compared with nonnally grown plants.
M ATERIAI.S AND M ETH O D S
Plant M ateria ls
Well grown plant and seeds o f chicory {Cichoriiim intybus L. cv. Focus) were obtained from the herbal garden o f Jamia Hamdard, New Delhi, India.
Seeds S terilization and G erm ination
Seeds were washed in mnning tap water for 30 min and soaked in solution o f liquid detergent (1% v/v Teepol) for 10 min, washed with distilled water 2-3 times and taken to a laminar flow chamber where they were disinfected with 0 .1 % (w/v) aqueous mercuric chloride (HgCl2) solution for 3-5 min. Seeds were further rinsed 5-6 times in sterile distilled water, soaked in 1% sodium hypochlorite solution for 5 minutes, rinsed with sterile distilled water 5-6 times to remove the traces o f mercuric chloride and sodium hypochlorite and germinated aseptically on basal MS (Murashigue & Skoog, 1962) medium containing 3% w/v sucrose,0.7% agar [18], pH adjusted to 5.8 and autoclaved at 121“C for 25 min. The cultures were incubated in a growth chamber at 2 6 ± r c under 16/8 h (light/dark) photoperiod using white fluorescent light (150-200 j.iE nV" s " ) and 55-65% o f relative humidity.
In vitro P ropagation of C. intybus
Establishment Stage
Ten- days-old seedlings with 5-7mm leaves were transferred to basal medium supplemented with Thidiazuron (TDZ) (0.05 mg/1) alone or in combinations with different concentrations of Indole acetic acid (lAA) (0.0, 0.3, 0.5, 1.0, 1.5, 2.0mg/l). The cultures were maintained at 26=tl°C and 16 h of photoperiod.
Multiplication StageWe studied the effect o f combination between lAA (0.0,
0.3, 0.5, 1.0, 1.5, 2.0mg/L) and TDZ (0.0, 0.002, 0.005, 0,008, 0.01, 0,02, l,0m g/L) using leaf explants (lamina). Table 2 indicates the following patterns; a) treatments involving no plant growth regulators (lAA and TDZ), b) only TDZ in varying concentrations without lAA, c) only lAA in varying concentration with no TDZ and d) both lAA and TDZ present in different varying concentrations. After four weeks shoot length and num ber o f leaves and shoots were recorded. The obtained plantlets were used as plant material for further subculturing. The effect o f TDZ and lAA and their different ratios on shoot induction, growth and esculin accumulation was determined by adding TDZ and lAA respectively. Furthermore, in similar way root induction was carried out by using Indole butyric acid (IBA) (0.1, 0,5, 1.0, 1.5mg/l) and a~Naphthalene acetic acid (NAA) (0,1, 0.5, l,0mg/l). Moreover, in the same experiment we carried out to find the effect o f combination on production o f shoots and regeneration capacity of explants. Different concenh'ations o f lAA (0.3mg/L to 2.0mg/L) with TDZ in the concentration o f (0.005mg/L to l.Omg/L) taking with each lamina explant is given in Table 2 and the propagation stages is given in Fig. (la , b and c).
Propagation o f Cichoriiim iniybm and Estimation ofEsciiUn
Adaptation and Acclimatization StageThe plantlets were removed from the culture vessels and
washed under tap water to remove agar from the roots. The washed plants were soaked for 1 0 min in 0 .2 % v/v H 2 O2 and cultured in small pots containing peat moss and transferred to green house. The cultivated plants were irrigated w ith water for next 2 0 days.
Esculin E x trac tion and A nalysis
Entire plants of C. intybus developed with tissue cultiu'e technique were collected and dried for 15 days in room tem perature before final drying in oven at 50"C for next 24 hours. The dried plants were powdered in electric grinder. For the preparation o f plant extract, five grams o f C. intybus powder placed in 100ml o f 70% v/v ethanol, in a soxhlet apparatus. The extract was filtered and concentrated under reduced pressure and at temperature of 4G°C on rotary evaporator. Appropriate weights o f the residue were pi'e- pared in methanol to obtain the various concentrations used for the experiment.
Q uantification o f Esculin by R P-H P L C M ethod
F,sculin was quantilled from the extract o f shoot parts o f in vitro propagated and harvested aerial parts of naturally grown C. intybus L, by an in-house developed RP-HPLC method. In brief, one month old well grown plants w ere taken for determination o f the esculin content and com pared its esculin content with naturally occurritig C. intybus L . Entire shoots o f C, intybus were dried for 15 days in room temperature before final drying in oven at 50“C for next 24 hours. The dried plants from both categories were pow dered in electric grinder. Five g o f dried powdered C. intybus was dissolved in 100ml of absolute ethanol. The mixtures w ere filtered through 0,45(am pore size filter paper before HPLC analyses were carried out. For RP-HPLC quantification, HPLC analysis was cari'ied out on a hchrosorb Cl 8 analytical column (250mm X 4.6mni i.d., lOjum; Shiseido Fine chemicals, Japan). The mobile phase was consisted o f methanol and water (60:40 v/v) and pum ped at a flow rate o f 1 .Oml/min and the detection was carried out at 249 nm. The temperature in the laboratory was 25±2°C. One ml o f esculin solution was pipetted out from 15g/100ml of esculin solution which was diluted up to 1 0 ml with the mobile phase to be used as analyte. 20).il o f the sample w as injected for HPLC analysis.
Statistical AnalysisThe percentage o f response and different parameters re
lated to the growth were monitored. D ata o f three independent experiments represented by 1 0 replicates from each experiment were subjected to statistical analysis (M eaniSE ) and New Duncan’s M ultiple Range Test [19J.
RESULTS AND DISCUSSIONIn-vitro development o f C. intybus has been reported
earlier by several scientists using somatic embryogenesis with explants including leaf, root, callus, suspension culture and different hormonal combination [20], B ut these works do not explain the prodviction o f esculin. Rehman et al. in the
Recent Patents on Biotechnology 20 i 1, Vol. 5, l\o. if 229
230 Recent Patents on Biotechnology 2011, Vol. 5, No. 3 O/iaili et al.
Table 2. Shoot Regeneration from Leaf Explants Cultured on MS M edium Containing D ifferent Concentrations of TDZ Alone or in Combinations with lA A (0.00 mg/L- 2.0 mg/Ij) for 4 Weeks
lAA (mg/L) TDZ (mg/L)% of Explants
Forming ShootsMean IViimJjer of
Shoots I’er Explants
0.00
0,00
0,00
0.00
0,30
0.30
0.30
0.30
0.50
0,50
0.000 5.2
0,002
0.005
0.008
39.7
54.4
0.000
0.002
0.005
0.01
0.000
0.002
69.7
4,1
76.8
9.3
48.2
5.9
76.5
01.13
10.1
15.8
14.5
09.4]
39.7
4i.6
21,2
07,24
58,70
0.50
0.50
1.0
0.01 51.09
0.02 79.26
0.002 100
31,70
62.50
73.10
1,0
1,0
1,0
1,5
1,5
1,5
0.01 91,08
0.02 100
0.05 85.43
0.002 1000.01 41.20
0.02 99.16
79.57
83.89
57.74
84,47
35,41
85.37
1,5 0.05 37.73 21,64
2,0 0.002 27.15 17.35
2.0 0.02 24.73 16.82
2.0
2,0
0.05 6.7
0,1 1.4
06.21
04.00
year 2003 reported the in-vitro regeneration o f C. intybus L. from leaf expiant and accumulation o f esculin. Report said the consumption o f high concentration of lAA along with specific growth regulator casein hydrolysate [lOOmg/L], Furthermore, the experimental duration seems to be higher [one month] and esculin content in fully grown regenerant was low [2 1 ],
We report a direct multiple shoot regeneration o f C. intybus L. from explants in just 20 days, with significant productivity (100% of explants produced 73.10% o f shoots and 99.16% of explants produced 85.37 shoots) when cultured on media with 0.02mg/L TDZ and 1.5mg/L lAA (Table 2).
Our report showed remarkably higher productivity in tenns o f frequency and total weight than an earlier report [22], In earlier works, numerous approaches were adopted for enhanced shoot and secondary metabolite production like
pretreatment o f leaf explants with 330mM glycerol, application o f antibiotic cefotaxime (lOOmg/L) in the culture m edium [23] or antimitotic agent (colchicine at 0.001%) used alone or combined with kinetin, but in case o f C, intybus L, this is not common. Furthermore, there was no significant positive impact for shoot production o f this species in earlier reports [24], In our study, the effect o f TDZ and lAA on direct shoot regeneration and production of esculin as secondary plant metabolite were studied and the effect o f IBA and NAA on the root formation was also studied. In our study we regenerated the shoot parts within 2 0 days.
Effect of Different Concentration of TDZ and lAA (in Combination) on Shoot Production
When TDZ was used alone, fewer explants (39-69%) with lesser number o f shoots ranging from 10 to 14,5 were
Propagation o f Clchovium intyhus and Estimation o f EscuUn Recent Patents on Biotechnology 2011, Vol. 5, No. 3 231
a - - .. .. .. *l«r
4 .
P; -'
IP
Fig. (1). Photographs showing the different stages o f grown C. intybtis L. A) at the end o f 11‘'‘ day B ) at the end o f 16"' day and C) on the 25"' day showing the well-grown leaves in teim s o f number and length.
produced, while varying the concentration of TDZ (O.OOSmg /L to 1 .Omg/L) alone and in combination with lA A (0.3mg/L to 2.0nig/L) a varying number o f shoots per explants (4.0 to 85.37) were produced (Table 2).
When TDZ (0.005mg/L to 1.Omg/L) was combined with 0.3 to 2,0 mg/L of lAA, significant improvement in percentage o f regenerated shoots and mean number o f shoot were achieved. It seemed that when O.Olmg/L or 0.02mg/L o f TDZ was combined with 1 .Omg/L of lAA, with a mean o f 79,57 and 83,89 shoots per explant, respectively, almost 100% of explants developed shoots. Combination o f TDZ with higher concentrations o f lA A was always more fruitful than the lower concentrations as seen in combination o f TDZ with 1,Omg/L o f lAA, which produced 83.89 shoots per explant while at 0,3ing/L o f lA A induced 4L6 shoots per explant. The highest number o f shoots and number of explants that developed the shoots w ere seen when 0.02mg/L o f TDZ was combined with L5mg/L of lA A forming 85.37 shoots per explant. As the concentration o f TDZ gone high (i.e., 0.5 mg/I or more) the number o f exphmts producing shoots and shoots per explant got decreased. Our data showed that, although TDZ produced some amounts o f shoots when used alone at low concenti'ations (0.005mg/L, O.Olmg/L, and 0.02 mg/L), its combinations with lA A was far more effective in shoot induction (Table 2). The result was in corroboration with earlier report as de-differentiation and re-differentiatioii o f plant cells is under the influence of exogenous chemical regulators and endogenous plant hormones in normal, direct and indirect regeneration [25]. Furthermore, in case of C. intybus, leaf lamina segments were more productive for callus and shoot development than petiole segments because petiole cells depend on leaf cells to some extent for showing its totipotency [26, 27], Furthermore, the promoting effect o f
TDZ on in-vitro development has been reported earlier for many species [28],
Enhanced esculin accumulation on application o f TDZ along with growth regulator can be explained on the basis o f following possible reasons: a) in the presence o f growth regulators (here TDZ and lAA), nucleic acid synthesis get increased leading to enhanced translation b) Positive regulation o f biosynthetic pathway (shikimate pathway) may also be responsible for enhanced biosynthesis o f esculin c) increased lateral branching, number of leaves and its size are responsible for accumulating high esculin.
In case o f lamina explants, vascularization o f tissues, hormone synthesis and metabolite production are fast that increases the overall shoot formation ability [29-30], These findings are consistent with our data when TDZ was used alone or combined with lAA, higher concentrations of TD Z induced more shoot formation on the lamina explants.
E F F E C T O F D IF F E R E N T AUXINS O N R O O T IN D U C TIO N
Multiple shoots were cut out from the parent plants and cultured on MS media containing different NAA and IBA concentrations for rooting (Table 3). In teniis of root generation, low ratio o f NAA to IBA (l.Onig/L o f IBA and 0,5mg/L o f NAA) seemed to be the most effective combination (Table 3). This treatment showed generation of 6.83±0.31 roots/ culture (mean±S.D) with 7.1±0.27cm (mean±S,D) increased concentration of NAA and IBA enhanced the num ber and length o f roots per culture (Table. 3). Results indicate that the combination between IBA (constant concentration) and low concentration o f N A A (0.5mg/L) enhanced the root formation. Nevertheless when concentration o f IBA and
2,12 Recent Patents on Biotechnology 2011, Vol. 5, No. 3 Ohndi lit a t
Table. 3. E ffect of D ifferent A uxins on R oo t Induction o f / / i vitro D erived L ea f E xplan ts of C. intybiis L. U n d er T otal D arkness in M S Solid M edium (H alf-S trength)
Auxins (mg/L)
NAA+IBA
0,1 + 0,1
Response (%) (Mcan± S.D)
51,42±6.19
Number of Root/Culture (Meiin ±S.D)
3.04±0.08
Root Length/ Culture (cm) (M eani S.D)
3.9±0.09
0.1+0.5
0.5+0.1
1.0+0.5
1.0+1.0
69.00+6.58
61,70±5.17
93.60+11.01
82.42+8.30
3.71+0.12
2.95+0.09
6.83+0.31
5.57+0.19
4.5+0.16
5.0+0.20
7.1+0,27
6.4+0.24
1.5+1.0 6S,48±7,42 3.31+0,14 4.2±0.13
NAA were high (1;1 ratio) root length and number o f roots were still high [5.57±0.19 roots/culture (m eaniS.D ) o f 6.4±0.24cm (mean±S.D).
The small C, intybus plantlets were successiully transferred to sterilized soil and kept under favorable conditions for two weeks and transferred to room condition at low humidity. Approximately 89% o f the vshoots survived through the hardening process. Rooting o f the regenerated shoots was readily achieved when excised shoots were cultured on medium containing varying concentrations o f NAA and further IBA, It was clear that IBA was more effective in root development than NAA but both were comparatively effective. Auxins are considered obligatory for the maintenance o f meristematic tissue proficiency. W ith the increased concentration of auxins, potency o f root and plant development get enhanced but upto certain level. This finding is in corroboration with earlier reports that showed excess o f auxin have inhibitory effect on lower plant part development including adventitious roots [31-33].
Q uantification o f Escuiiii by R P-H PL C M ethod
Esculin is poorly water soluble dmg but soluble in organic solvent like methanol. The RP-HPLC method was optimized with a view to develop a quantitative method for the estimation o f Esculin in C. intybus L. extract. The mobile phase was optimized as methanol-water (60;40%v/v) at a flow rate of Iml/min with the retention time o f Esculin 6.925 min and theoretical plate o f 20680, which shows good sensitivity of the developed method. The UV spectnim o f esculin showed the highest absorbance at 249nm in solution made up o f mobile phase. Quantification was achieved with UV detection at 287nm based on the peak area. Chromatograms obtained for the Esculin standard and extract revealed that they had similar pattern as shown in Fig, (2A and 2B). Linearity was evaluated over working concentrations containing 1, 2, 4, 8, 10, 20 and 50(ig/ml o f Esculin, Peak area and concentration were subjected to feast square linear regression analysis to calculate the calibration equation and con’elation coefficient. The regression equation was y= 22899x (where y is the response and x the am ount o f Esculin), Linearity was found over the concentration range 1 -50/ig/ml with a correlation, coefficient of 0.999. The linearity of the calibration
curve was validated by a high value correlation coefficient. DL (limit of detection) and QL (quantification limit) of the method were found to be 19.97ng/ml and 60.596ng/ml respectively as per the quantitative formula for LOD and LOQ given by ICH [34] (ICH Harmonized Tripartite Guideline) which indicate that the proposed method can be used for detection and c)uantification of Esculin in a very wide concentration range. Our experimental outcome o f the culture technique showed that exogenous plant growth regulator (here in this case TDZ) and endogenous growth regulators (auxins) have proportional effect on plant development and secondary metabolite synthesis (here esculin from the leaf o f C. intybus L.), Quantification o f esculin indicated significantly high recovery/yield (76,23%) from our in-house tissue culture developed C. intybus L. as compared to the naturally occurring C. intybus L, (49,45%). Such response maybe due to nutritional differences {In-vitro m edia and field condition) and may even be due to different genotypes.
C O N C LU SIO N
In vitro propagation o f C. intybus and evaluation o f total hepatoprotective esculin content in in vitro cultured plants were quantified and compared with norm al grown plants and ITPLC quantification indicated significantly high recovery/yield (76.23%) from our in-house tissue culture developed C. intybus L. as compared to the naturally occurring C. intybus L. (49.45%), In short span of time (20 days) 99.16% o f explants produced 85.37 shoots per leaf explants when cultured on media with 0.02mg/L TDZ and lA A (1.5mg/L). Approximately 79% of the shoots sui-vived through the hardening process. Our findings may be helpful in germplasm generation o f disease free C. intybus as well as to develop a large-scale production o f secondary metabolites, particularly esculin.
A C K N O W LED G M EN T
Centi-e for Transgenic plant development. Dept, o f B iotechnology, Jamia Hamdai'd University, New Deihi-62 are conceded for providing the adequate facilities for this work.
C O N FL IC T O F IN T E R E ST
Authors declare no conflict o f interest.
Propagaiiort o f Cichorhtm miyhus and Estimation o f Esculin ilcceiit Pat{int% on Biotechnology 201), Voi 5, No. S 233
R e s t e n t iB n T i m e ft
H L
~ Z u . 1 ” [ . . J s ? . A _____1 ...........................1 1 ( 1 ' 1 1
. }.Q(3
2.B
Fig. (2). A) Chromatogram o f Esculin in the mobile phase; methanol and water in the ratio o f 66:34 (%v/v). B) Chromatogram of C. intylms L. extract in the mobile phase; m ethanol and water in the ratio of 66:34 (%v/v).
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