Principles of plant infection
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Transcript of Principles of plant infection
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PRINCIPLES OF PLANT INFECTION
DR. RAJBIR SINGH Assistant Professor
Department of Plant Pathology Gochar Mahavidyalaya, Rampur Maniharan, Saharanpur (UP), India Affiliated to Ch. Charan Singh University, Meerut (UP), India
Email: [email protected], [email protected]
Cell No. 91-9456613374
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(A). Penetration - “Entry of pathogen in the host is called penetration”
(i). Direct penetration fungi, nematodes & parasitic pls.
Mechanic forces & enzymatic softening
By appressorium in fungi
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3. Haustorium
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2. Appresorium
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(ii). Through woundsAll bacteria, most fungi, some virus & viroidEnter through wounds
Virus, MLO, RLO enter through wounds made by vector
iii). Through natural opening
(a). Stomata
Many fungi & bacteria enter through stomata
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Penetration through Stomata
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(b). Hydathodes
are more or less permanently open pores at
the end on the tip of leaves
Bacteria enter through hydathodes
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(c). Lenticels
Are openings on fruits, stem, tubers that
are filled with loosely connected cells to
allow passage of air
Few fungi and bacteria enter through lenticels
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(B). Infection
“The establishment of a pathogen with in a host plant”
“Infection is the process by which pathogen
establish contact with susceptible cell or
tissues of the host and procure nutrients
from them”
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(C). Invasion
“ The spread of the pathogen with in the host”
Fungi spread - Intercellular, intercellular
Bacteria - Intercellular, intercellular
Virus, virods, MLO, phytoplasma & RLO
By moving from cell to cell interacellularly
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(D). Dissemination or Dispersal of Pathogen
(A). Autonomous Dissemination
(1). By Soil
(2). By Seeds
(3). By Plant and Plant Parts
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(B). Passive Dissemination
(1). By Air
(2). By Water
(3). By Vectors
(4). By Humans
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Thank You