Phytochemical Society of North America Sociedad ... · PSNA News Page 1 Summer 2018 PSNA News. In...

PSNA News Summer 2018

PSNA News

In this issue: PSNA 2018 Elections, please cast your ballot, pages 3-4 2018 Meeting in San Luis Polosti, Mexico, pages 9-11Registratiin NOW open: http://congresos.uaslp.mx/57psna/Paginas/Home.aspx Annual Show of Tree Leaf Colour, by Constance Nagel, pages 4-8The web PDF version can be downloaded from the website: www.psna-online.org.

Phytochemical Society of North AmericaSociedad Fitoquímica de América del Norte

Société Phytochimique de L’Amerique du Nord Volume 56, Number 2 Summer 2018

continues on page 3 ...

Concordia (and the PSNA) mourns the passing of Ragai IbrahimDistinguished Professor Emeritus taught at Concordia’s department of biology from 1967 - 1997

Posted on November 24, 2017By: Department of BiologySource: Faculty of Arts and Science

https://www.concordia.ca/cunews/ar t sc i /2017/11/24 /concord ia -mourns-the-passing-of-ragai-ibra-him.html?c=artsci

Dr. Ragai Ibrahim1929-1917

Dear PSNA Members,

I hope you are enjoy-ing the summer thus far and are as excited as I

President’s Message

am about the upcoming PSNA Con-ference in San Luis Potosí, Mexico (more on pages 9-11 of this newslet-ter). You will be receiving several e-mails reminding you to register for our annual conference. Yes, I know, your Inbox is experiencing way too much traffic, but we need a critical mass of registrants for a financially viable meeting. The local organiz-ers, in particular Denisse Atenea der Loera Carrera, and the Advisory Committee have lined up an im-pressive roster of invited speakers and PSNA awardees. Additional oral presentations will be selected based on submitted abstracts, and I am confident these will be of excel-lent quality as well. If you haven’t already done so, I would encourage you to register soon, which helps us to plan out the details of the meeting. You will be rewarded with a quality experience, both scientifically and culturally, in a wonderful location.

In this newsletter, you will also find information about nominees for

PSNA officer positions on pages 3-4. All members will be provided, via-email, with a link to our voting portal. I am very glad to inform the membership that Argelia Lorence, Arkansas State University, has ac-cepted the nomination for president serving the 2019/2020 term. I am also very pleased to announce that Li Tian, University of California at Da-vis, has accepted the nomination for the vacant secretary position (three-year term starting in August 2018). Both Argelia and Li will be running unopposed, but it is still important for the membership to actively par-ticipate in the elections.

Lastly, I would like to encourage our members to take an active part in the shared governance of our society. If you would like to bring issues to the attention of the Executive Commit-tee, please do not hesitate to contact me via e-mail ([email protected]). Contact details for all members of the Executive Committee are listed on the PSNA website and we do ap-preciate your feedback.

Thanks for reading,Mark Lange,PSNA President 2017/2018


PSNA EXECUTIVES

PresidentMark Lange, Ph.D.Washington State UniversityInstitute of Biological ChemistryPullman, WA 99164-6340 USAPhone: [email protected] ElectDeyu Xie, Ph.D.North Carolina State UniversityDept. Plant & Microbiology4213D Gardner HallRaleigh, NC 27695-7612 USAPhone: [email protected] PresidentMark Berhow, Ph.D.USDA, ARS, NCAUR1815 N. University StreetPeoria. IL 61604Phone: [email protected]@illinois.edu SecretaryArgelia LorenceArkansas Biosciences Institute andDepartment of Chemistry and Physics,Arkansas State University,P.O. Box 639, State University, AR,72467, [email protected] Kumar, Ph.D.423 Brown Hall Box 70703East Tennessee St. Univ.Johnson City, TN 37614 [email protected], ReviewsReinhard Jetter, Ph.D.Departments of Botany and Chemistry,University of British Columbia,6270 University Blvd, Vancouver BC,V6T 1Z4 [email protected]

The Phytochemical Society of North America (PSNA) is a nonprofit scientific organization whose membership is open to anyone with an interest in phytochemistry and the role of plant substances in related fields. Annual membership dues are U.S. $60 for regular members and $30 for student members. Annual meetings featuring symposium topics of current interest and contributed papers by conference participants are held throughout the United States, Canada, and Mexico. PSNA meetings provide participants with exposure to the cutting-edge research of prominent international scientists, but are still small enough to offer informality and intimacy that are conducive to the exchange of ideas. This newsletter is circulated to members to keep them informed of upcoming meetings and developments within the society, and to provide a forum for the exchange of information and ideas. If you would like additional information about the PSNA, or if you have material that you would like included in the newsletter, please contact the PSNA Secretary or visit our website at www.psna-online.org. Annual dues and changes of address should be sent to the PSNA Treasurer. Also check the PSNA website for regular updates.The PSNA is an all volunteer organization which depends on its membership to run the organization. We appreciate the time and effort these volunteers are putting in to keep the organization up and running. As a member, please consider volunteering to serve on one of these committees. The PSNA can always use more help!

ThePhytochemical

Society of North America

WWW.PSNA-ONLINE.ORG

PSNA NewsFall 2017

ADVISORY BOARD

Michael Sullivan USDA, Madison Philipp Zerbe UC Davis Dorothea Tholl Virginia Tech UniversityLi Tian UC Davis Armando Alcazar Magana Oregon State University Soheil Mahmoud Univ British Columbia, KelownaDejan Nikolic University of Illinois, ChicagoBjoern Hamberger Michigan State UniversityElvira DeMeija University of Illinois at UCDenise de Loera Carrera Univesidad Autonoma de San Luis Polosti

Past PSNA Presidents


It is with great sorrow that the de-partment of biology announces the passing of Distinguished Emeritus Professor Ragai Ibrahim on Sunday, the 19th of November 2017.

Dr. Ibrahim was a truly eminent professor in the department of bi-ology for 35 years. He was a driv-ing force for excellence and for the development of the department, an internationally recognized expert in the field of plant secondary metabo-lism, and a dear friend to the many colleagues and students who knew him and worked with him over his career.

Dr. Ragai Ibrahim was born in 1929 in Heliopolis, a district of Cai-ro, Egypt. He obtained his BSc Hon-ors degree in botany and chemistry from the university of Cairo in 1949, and then worked in industry for 6 years. He returned to the university and earned an MSc in plant physiol-ogy from the university of Alexan-dria in 1958 and moved to Canada.

In 1961, he obtained a PhD in plant biochemistry from McGill university under the supervision of professor Neil Towers and returned to Egypt as a faculty member at the university of Alexandria.

He returned to Canada in 1967 and initiated his long academic ca-reer as a professor in the biology department of Sir George Williams university, one of the two founding institutions of Concordia.

In the vast field of plant second-ary metabolism, Dr. Ibrahim focused on studying flavonoids, a group of organic compounds that play im-portant roles in UV light filtration, defense against microbes, signals for plant microbe interactions and that also contribute to the nutritional and medicinal quality of foods. His laboratory was instrumental in the discovery of many novel enzymes in flavonoid metabolism in plants in-cluding methyltransferases, glucos-yltransferases and sulfotransferases.

Ibrahim continued from page 1... His lifelong research career re-sulted in more than 170 refereed publications, 40 review articles and book chapters, and training of over 30 graduate students and research associates. Many of his students went on to successful careers as uni-versity professors and leaders in in-dustry.

He received international recog-nition and numerous honours for his outstanding contributions to plant biochemistry, which included Presi-dent and Honorary Life Member of the Phytochemical Society of North America, Alexander von Humboldt Scholar in 1975, Groupe Polyphe-nols Medal in 1992, Canadian Soci-ety of Plant Physiology/La Société Canadienne de Biologie Végétale (CSPP/SCBV) Gold Medal, 2004, and Distinguished Professor Emeri-tus of Concordia university.

As a generous and inspiring sci-entist, he created prizes for graduate students in CSPP/SCBV, the Groupe Polyphenol and the biology depart-ment of Concordia university.

Dr. Ibrahim retired from teaching in 1997 and actively continued re-search as a Distinguished Professor Emeritus and trained graduate stu-dents and postdoctoral fellows until recent years.

Dr. Ibrahim was the second child from a family of five children. He is survived by Lilian, his beloved wife of over 50 years, his younger sister Samira, younger brother Nabil, six nieces and seven nephews.

Ragai was a dear and generous friend to all who had the good for-tune to work with him. He is missed.

Nominated for PSNA President:Dr. Argelia Lorence

Arkansas State University([email protected])

Argelia Lorence is a Tenured Profes-sor at the Department of Chemistry and Physics of Arkansas State Uni-versity (A-State). She earned a BS in Biochemical Engineering from Au-tonomous Metropolitan University (UAM), and Master’s (1995) and Ph.D. (1997) degrees in Biotechnol-ogy from the National Autonomous University of Mexico (UNAM). From 1998 to 2002 Lorence worked as an Assistant Professor at the Au-tonomous University of the State of Morelos (UAEM, Mexico). At UAEM her group focused on engi-neering cell cultures of Camptothe-ca acuminata to accumulate more camptothecin, an alkaloid with anti-cancer and anti-AIDS activities. Be-fore joining A-State, Lorence spent four years as a Post-doctoral Re-search Associate at Texas A&M and at Virginia Tech working at Prof. Craig Nessler’s Laboratory working on metabolic engineering of various plants including opium poppy. In collaboration with her colleges from Virginia Tech in 2004 Dr. Lorence discovered a new route for ascor-bic acid formation in plants that in-volves myo-inositol as entry point. The Lorence Laboratory uses Arabi-dopsis thaliana to better understand the role of the various subcellular pools of ascorbate in the physiology of plants. The ongoing research in her group has potential applications


for the development of fruits and vegetables with longer shelf-life, as well as the development of crops with enhanced nutritional content, growth, and tolerance to environ-mental stresses. Since 2011 Lorence leads the plant high throughput phe-notyping facility at A-State. In 2017 Lorence was named the James and Wanda Lee Vaughn Endowed Pro-fessor in the College of Sciences and Mathematics at A-State.

Lorence received the Arthur Neish Young Investigator Award from PSNA in 2002 and has been a mem-ber of the society since then. She has been a speaker at the 2002, 2005, 2012 and 2017 meetings. She served in the PSNA Advisory Board from 2012 to 2014. Since 2014 she has been serving as Secretary of PSNA. She is currently a candidate to serve as President of PSNA for the 2019-2020 period. As president she seeks to 1) honor the contributions of the people that have been the pillars of the group, 2) continue to incentiv-ize the careers of the younger PSNA members and 3) attract new talent to join the society.

Nominated for PSNA Secretary:Li Tian

Univ. of California at [email protected]

Li Tian received her Ph.D. in Plant Biology at Michigan State Univer-sity and obtained postdoctoral train-

ing in natural product biochemistry at the Samuel Roberts Noble Foun-dation. She joined the faculty at the University of California, Davis in 2008. She is currently an Associate Professor in the Department of Plant Sciences and a member of the Food for Health Institute. Her research group is interested in understand-ing how phytonutrients are made in plants using molecular, genetic, and biochemical tools. They also examine how accumulation of phy-tonutrients in plants is controlled by different factors under various en-vironmental conditions. Their long-term goal is to apply the knowledge obtained from these investigations to improve the nutritional value and agronomic performance of crop plants.I have been a member of the PSNA since 2014. After serving as a mem-ber of the Scientific Organizing committees of the 2014 and 2015 annual PSNA meetings, I chaired the Scientific Organizing Committee for the 2016 annual meeting that took place at the University of California, Davis. At this meeting, we attracted about 150 attendees and hosted 7 symposiums on topics ranging from integrated omics to phytochemical signaling. We also held a special symposium in recognition of Pro-fessor Eric Conn’s pioneer contri-butions to phytochemical research. Since 2017, I have been serving on the Advisory Council of the PSNA. Going forward, as Secretary of the PSNA, I envision playing a sup-porting role under the leadership of the society President and working closely with the Advisory Council to facilitate communications, pro-mote membership and participation, and embrace PSNA as the “home” society for phytochemists in North America and beyond. I look forward to serving our society in this new ca-pacity!

THE ANNUAL SHOW OF TREE LEAF

COLOUR

Constance Nozzolillo, Professor of Biology, UOttawa (Retired)

Reprinted from The Canadian Bo-tanical Association Bulletin

Vol 49 Number 2 September 2016 pages 63-66.

As the end of summer nears, the green leaves of our deciduous trees undergo a change in colour. Those of some be-come a brilliant red like the red maple while others change to a yellow or golden colour like the birch and all of them ultimately become a brown colour. Despite the economic impor-tance to our tourist industry of the autumnal display of colour of the trees in our forests, relatively little scientific study has been made of this annual phenomenon. As a result, we are subjected in the newspapers and on websites to an imaginative description of the process too often only distantly based on established facts. Of the many websites turned up by a Google search of “autumn color”, few explanations con- form entirely to the present incomplete state of knowledge. However, in the past two decades, ground-breaking work in the north-east USA and in northern Sweden has yielded a deeper understanding of the coordi-nated processes ongoing in the leaves as deciduous trees prepare for winter.The reason for the autumnal change is variously attributed to lower light, cool temperatures, or various other environmental factors, although many descriptors have now grasped the fact that daylength is significant. In point of fact it is not the daylength itself that is important. The trees and shrubs recognize the increasing length of time between sunset and sunrise, i.e. the dark period, as the summer progresses and thus begin to make preparations for winter surviv-


al. They are able to do this because of an invisible blue- green pigment called phytochrome in their cells. This pigment serves as a timepiece, enabling the plant to ignore the sug-gestion of warm autumn days that summer may never end and to real-ize that ambient temperature is not a reliable marker of the seasons. Thus the process called leaf senescence is begun.

The colour change of the leaves is only one of many processes going on as the leaf senesces but it is the one most obvious to us. The green leaf of the maple and other trees contains several pigments in addition to phytochrome. Most visible are the two green chlorophylls present in tiny intracellular structures called plastids. These pigments are the key to our survival on earth because of their ability to trap the energy of sunlight for food production by the leaf. Also present in the plastids, but masked by the chlorophylls, are sev-

eral kinds of orange and yellow pig-ments called carotenoids, a name derived from the Latin name of the orange carrot root. Over the course of a few days or weeks, the green of chlorophyll disappears. The carot-enoids also are destroyed but not so rapidly as the chlorophylls, thus the leaf becomes a yellow colour. They are yellow, not orange, because the xanthophylls, the yellow carot-enoids, are five times more abundant than the carotenes, the orange ca-rotenoids, as a result of their slower breakdown.

At the same time, the leaves of some species begin to produce red-coloured pigments called anthocyanins. (These are the same class of pigments that are in the healthful blueberry and cranberry fruits we are encouraged to eat and they are not normally pres-ent in the leaf all summer, as many re-ports in the past have stated. Leaves of trees that produce anthocyanins in the summer, such as horticultural

varieties of the Norway maple, ap-pear almost black in colour because the green of the chlorophylls and the red of the anthocyanins absorb near-ly all the light that passes through the leaf.) If nearly every cell of the leaf contains these pigments in high concentration, the leaf will be a bril-liant red colour like those of the red maple, the carotenoids again masked from view. If the concentration is low, the leaf will appear orange like those of the sugar maple because we see the red of the anthocyanins mixed with the yellow of the carot-enoids. Thus the orange colour seen in sugar maple leaves is not due to orange carotenoids as frequently stat-ed, even in some botanical textbooks, but to the mixing of the primary red and yellow colours. Newly formed carotenoids do result in a red colou-ration in some species that retain their leaves in winter, red cedar being an example.

How the annual disappearance of an amount estimated to be a billion tons of the green chlorophylls is brought about has been subjected to rigor-ous study only in the past three de-cades. During the growing season, as reported on some websites, the levels of chlorophylls in the chloro-plasts tend to decrease and increase to an extent dependent on growing conditions, with chlorophyll break-down resulting from environmental stresses that tax the protective func-tions of the carotenoids beyond their capacity to prevent damage, and bio-synthesis of chlorophyll to repair the damaged photosynthetic systems. The fact that chlorophyll is easily destroyed is evidenced by the rapid bleaching of the leaves of an over- wintered houseplant abruptly put out into bright spring sun- shine, but a leaf properly adjusted to bright light conditions rarely, if ever, bleaches. Once the process of senescence is underway, chlorophyll biosynthesis ceases and a regimented, enzymic

A hazel shrub showing the variation in leaf colour on the same plant.©Constance Nozzolillo


process of chlorophyll breakdown is begun. It is now known to be a highly controlled, multi-step process as-sociated with major changes in the structure of the plastids.

The purposes of this process are two-fold. An important result for the tree is the release of nitrogen, the most essential element for plant growth, from the proteins to which the chlo-rophylls had been attached. The re-moval of this nitrogen from the leaf for storage in the trunk or other parts of the tree before the leaf falls off is a significant activity. Results avail-able to date demonstrate that trees vary considerably in their ability to do this. Some are able to remove as much as 80%, whereas others remove relatively little before the leaves fall. A second function is to transfer any potentially toxic break-down products into the vacuole of the cell. Interestingly, the N in the chlorophyll itself thus remains in the leaf.

And what is the purpose, if any, of synthesizing new complex chemical structures like the anthocyanins? Scientific study directed to answer-

ing this question has begun only in the past few decades and provides some evidence to indicate that the red pigmentation may protect the leaf from the damaging effects of light so that more of the valuable nitrogen and other nutrients can be transferred to the trunk. In addition, it has been shown experimentally that leaves that are red are retained on the tree longer than those on the same tree that do not produce an-thocyanins. Another question fre-quently asked is “Won’t anthocyanin synthesis require energy that the leaf will no longer have freely avail-able because of the loss of chloro-phyll?” Of course energy will be re-quired both to make the anthocyanins and also to transport the nutrients but this energy can be provided by “burning” the residual sugars in the cells of the leaf in the tiny “furnaces” called mitochondria, a process called respiration. These bodies provide the energy necessary for the activities of every living cell, plant or animal. Ac-cumulation of sugars and starch in autumn leaves is well documented. Photosynthesis in those cells that re-tain intact plastids may continue but at levels that cannot compensate for energy lost due to respiration.

And how are the red pigments made? Contrary to statements frequently made in the past and as noted above, these red pigments are not present in the leaf blade during the summer in a green leaf blade, although the leaf stalk may be red in some species, but are made anew in the autumn in those species equipped with the necessary genetic information. That fact is now recognized in most popular explana-tions. The answer usually provided for the “how” question, however, completely ignores the current state of knowledge of the process by stat-ing that the sugars remaining in the leaf as a product of photosynthesis are converted into anthocyanins. This may sound reasonable, especial-ly since some sugars are incorporated into the final structure.

However, innumerable studies over the past several decades have shown that building of the part of the antho-cyanin molecule that is responsible for the red colour involves sugars only as a source of energy to drive the process. There is increasing evi-dence, however, that sucrose, the sugar we put in our coffee and the form in which sugars are transported in a plant, acts as a signal for antho-

Fall Colours in Gatineau, QC. ©Constance Nozzolillo


cyanin synthesis to begin. It occurs in the cytoplasm of the cell in a tight-ly coordinated multi-enzyme pro-cess, the final step of which is to add one or more sugars. Only then is the molecule so formed called an antho-cyanin. It does not leave the cell in which it is made but is deposited into the vacuole, a large sac filled with a slightly acidic watery solution that occupies most of the cell volume.

The amounts of anthocyanins sub-sequently produced depend on many factors, including tempera-ture, light exposure, and nutrient status. Scientific studies back up the observation that bright sunny days and chilly nights result in the best display of colour. A current “fashion” in popular explanations is to add that “chilly” cannot include sub-zero temperatures, but a touch of “jack frost” overnight does won-ders to enhance the colouration of our hardy native species! It is true that freezing will kill the leaf cells, but most temper- ate plants develop frost hardiness to an extent that en-ables them to endure a few degrees of sub-zero temperatures with no ill effect. Surely so do the leaves on a native tree as the woody tis-sues and dormant buds of the stem to which they are attached prepare for winter. On the other hand, in warm weather, especially if the days are overcast, much of the chloro-phyll remains and little of the red pigments is made. As any casual observer may note, more red colour is present in parts of the tree fully exposed to sunlight. It is important to keep in mind that a typical leaf is comprised of many individual cells each responding more or less independently to its environment. Although the overall process of preparing for winter is synchro-nized and ultimately leads to leaf fall, some cells may retain normal functioning much longer than oth-ers. Thus the colour of the leaves is

not the same in all parts of the tree or even in all parts of the same leaf.While all these colour changes are ongoing, the leaves are prepared for the phenomenon familiar to us as leaf fall. Preparation for separation from the tree is done so as not to leave an open wound at the point of attach-ment. An impermeable corky layer, called an abscission layer, is gradually built across the base of the leaf stalk. Such a layer is obviously incom-patible with the already-mentioned desirability of removing as much as possible of the valuable nutrients in the leaf for storage in the trunk; how can nutrients be moved past an imper-meable layer? The statement usually made in popular explanations is that the sugars are trapped in the leaf by this layer and are thus available for conversion to anthocyanins. But is it true that sugars are indeed “trapped” or are they there for the specific pur-pose of providing energy when pho-tosynthesis is no longer occurring? In fact the tissues through which the nutrients are moved, the vascular tis-sues which make up the veins of the leaf, are the last part of the leaf stalk to be cut off. Questions that have yet to be answered include: “How long into the autumn is water carried into the leaf? And how long does the part of the veins, the phloem tissue, re-sponsible for moving nutrients out of the leaf remain functional?” All we know for certain is that finally the leaf is held onto the tree only by the veins which ultimately break off to allow it to float away. Its point of departure is marked by a charac-teristic leaf scar that can be used to identify the tree in winter, its smooth corky surface marred by the broken remnants of the lignified xylem tis-sues of the vascular system.

And now we come to the matter of the final brown colour seen in the fallen leaves and also in leaves of some spe-cies that are still attached as in the white oak, for example. Again, expla-

nation of the brown colour on web-sites is highly variable and mostly unrelated to the probable truth. There is no brown pigment already present in the tree leaves under discussion, or at least none that any phytochem-ist has isolated and reported on. The most likely cause of browning is the phenomenon familiar to anyone who has left a slice of apple or potato exposed to air. The exposed surface soon becomes brown because the tissues of apple and potato contain an abundance of colourless pheno-lic substances that are polymerized by enzymes to yield a brown shade. (There is now a genetically engi-neered variety of apple and another of potato that do not brown when cut.) Tree leaves also contain a com-plex mixture of phenolics, most of them formed at various steps of the same pathway that leads to antho-cyanins as well as the enzymes noted above. Notable among them are two classes of vegetable tannins, con-densed tannins (proanthocyanidins), polymers of catechins, whose synthe-sis branches off at a late stage of the pathway to anthocyanins and hydro-lysable tannins that are polymers of gallic acid combined with glucose. (The chemistry of these compounds is exceedingly complex but that has not prevented their use over count-less centuries in the production of leather from animal skin!) Thus there are ample compounds available for the browning phenomenon to occur in senescing leaves.

Our trees must maintain the deli-cate balance of retain- ing normal functioning of the leaves for as long as possible consistent with making adequate preparations for winter! Beginning the process of leaf senes-cence too soon will rob the tree of the ability to make food during the warm days of autumn but, on the other hand, starting too late may re-sult in an abrupt cessation of all met-abolic activity due to a killing frost


before the tree has time to recover nutrients from its leaves.

Key ReferencesArchetti, M., T. F. Döring, S. B. Hagen, N. M. Hughes, S.R. Leather, D. W. Lee, S. Lev-Yadun, Y. Mane-tas, H. J. Ougham, P. G. Schaberg, H. Thomas 2009 Unravelling the evo-lution of autumn colours: an inter-disciplinary approach. Trends Ecol. Evol. 24, 166–173.

Charrier, G., M. Poirier, M. Bon-homme, A. Lacointe, T. Amelio 2013 Frost hardiness in walnut trees (Jug-lans regia L.): how to link physiol-ogy and modeling? Tree Physiol. 33: 1229-1241.

Davies, K.M., K.E.Schwinn 2006 Molecular biology and biotechnol-ogy of flavonoid biosynthesis. in Flavonoids: Chemistry, Biochemis-try and Applications Eds. O. M. An-dersen, K.R Markham pp. 143-218.

Ferreira, D., D. Slade, J.P.J. Marais 2006 Flavans and proanthocyanidins. in Flavonoids: Chemistry, Biochem-istry and Applications Eds. O. M. Andersen, K.R Markham pp.553-616.

Fracheboud, Y., V. Luquez, L. Björkén, A. Sjödin, H. Tuominen, S. Jansson 2009 The control of autumn se-nescence in European aspen. Plant Physiol. 149: 1982–1991.

Haslam, E.H. 1991 Gallic acid and its metabolites. in Plant Polyphe-nols, Synthesis, Properties, Signifi-cance, Eds.R.W. Hemingway, P.E Laks, Plenum Press pp. 169-194.

Hoch, W. A., E. L. Singsaas, B. H. Mc-Cown 2003 Resorption protection: anthocyanins facilitate nutrient re-covery in autumn by shielding leaves from potentially damaging light lev-els. Plant Physiol. 133: 1296–1305.

Hörtensteiner, S., B. Kräutler 2010 Chlorophyll breakdown in higher plants. Biochem. Biophys. Acta 1807: 977-988. Keskitalo, J., G. Bergquist, P. Gardeström, S. Jansson 2005 A cellular time-table of autumn senescence. Plant Physiol. 139: 1635–1648.

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PSNA 2018 Conference Program August 4-8, 2018 All oral presentation will be held in the Rogelio Jiménez Auditorium at the Facultad de Ciencias Químicas,

UASLP

Speakers: http://congresos.uaslp.mx/57psna/Paginas/Speakers.aspx


The next meeting of the PSNA will be held at the Universidad Autonoma, in San Luis Potosi, Mexico, August 4 – 8, 2018. The meeting will feature the rich phytochemical research of Mexico as well as the great slate of PSNA speakers and pre-sentations. The University has outstanding programs in plant chemistry and biochemistry and is located in historic San Luis Potosi. “where you can get a glimpse of the past, proudly reincarnated through the finely preserved streets, facades and architecture of our city center” The PSNA is making a special effort to provide travel awards to encourage the attendanace of students for this meeting. Re-serve a spot on your calendar now for this exciting phyto-chemical-focused meeting. Trav-el to San Luis Potosi is easy, with direct flights from Mexico City, Houston, and Dallas. Reg-istration, lodging, and abstract information will be posted soon after the new year begins.

We look forward to seeing you in Mexico for 2018!

2018 TENTATIVE CONFER-ENCE PROGRAM

Saturday, August 4, 2018Real Plaza HotelConference RegistrationWelcome Reception Sunday, August 5, 2018Conference Registration, Rogelio Jiménez Auditorium LobbySymposiums 1-4Poster Session with Refresh-ments, Professional Exams and Council Halls Monday, August 6, 2018Plenary Symposiums 5-8Poster Session with Refresh-ments, Professional Exams and Council Halls

Tuesday, August 7, 2018Symposiums 9-11Presentation PSNA 2019Traditional “Callejoneada” through historic downtown Wednesday, August 8, 2018Symposiums 12 & 13Tour in Museum Laberinto de las Ciencias y las ArtesVisit to UASLP Botanic GardenAward Banquet, Edificio Central de la UASLP


LODGING

Meeting attendees are responsi-ble for making their own lodging reservations directly with the ho-tel. A block of rooms have been reserved at the hotel designate be-low. Please note that room rates include tax and/or hotel fees. Attendees should identify them-selves as with PSNA 2018 when making reservations. Please veri-fy cancellation policies with each property.Please book by July 16, 2018 for group rate, based on avail-ability.

Hotel Real Plaza

Av. Venustiano Carranza 890, San Luis Potosí, S.L.P. MéxicoReservations: +52 444 8146969Room Rates: $38.00 per single room/per night$46.00 per double room/per night$55.00 per triple room/per night$63.00 per quadruple room/per nightIncludes: Complimentary wireless internet and buffet breakfastLocated: 2.5 miles from Fac-ultad de Ciencias Químicas UASLP, and 5 minutes walking from downtownWebsite: http://www.english.real-plaza.com.mx/

Registrationh t t p : / / c o n g r e s o s . u a s l p .mx/57psna/Paginas/Registration.aspx

The submission deadline is July 13, 2018.All fees are in $USD and include receptions, beverage breaks, lunches, banquet and registration materials.

International Bank Transfer:UNIVERSIDAD AUTONOMA DE SAN LUIS POTOSIBANAMEX SUCURSAL: 4536CUENTA: 9000024CLABE INTERBANCARIA: 002 700 4536 9000 0242 SWIFT: BNMX MX MM

National Bank Transfer:UNIVERSIDAD AUTONOMA DE SAN LUIS POTOSIBANCO NACIONAL DE MEXI-CO, S.A. (BANAMEX)SUCURSAL: 4536CUENTA: 501CLABE INTERBANCARIA: 002 700 4536 0000 5017REFERENCIA: nombredel partici-pante

Please remit payment & this form to:2018 PSNALic. Cristina Cabrera GonzálezManuel Nava No. 6, Zona Univer-sitaria CP 78210, San Luis Potosí, México [email protected] [email protected] invoice, please send RFC, name and address

Hotels near Facultad de Cien-cias QuímicasCity Express Junior San Luis Potosí Carranza https://www.cityexpress.com/en/junior/hotels-mexico/san-luis-potosi/san-luis-potosi/carranzaCity Express Zona Universitaria https://www.cityexpress.com/en/express/hotels-mexico/san-luis-potosi/san-luis-potosi/zona-uni-versitaria

Call for abstractsh t t p : / / c o n g r e s o s . u a s l p .mx/57psna/Paginas/Call-for-Ab-stracts.aspx

If you are an undergrad, gradu-ate student or postdoc, you can indicate if you want your submis-sion to be considered for a Travel Award or a Best Presentation/Poster Award during the submis-sion process. Awards will be pre-sented during the Award Banquet on Wednesday, August 8. As part of the online submission process, you will be required to upload your abstract as Microsoft Word .doc or .docx.


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Phytochemical Society of North AmericaSociedad Fitoquímica de América del NorteSociété Phytochimique de L’Amerique du Nord


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Phytochemical Society of North America Sociedad ... · PSNA News Page 1 Summer 2018 PSNA News. In...

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