principles of plant infection
TRANSCRIPT
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
(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
3. Haustorium
2. Appresorium
(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
Penetration through Stomata
(b). Hydathodes
are more or less permanently open pores at
the end on the tip of leaves
Bacteria enter through hydathodes
(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
(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”
(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
(D). Dissemination or Dispersal of Pathogen
(A). Autonomous Dissemination
(1). By Soil
(2). By Seeds
(3). By Plant and Plant Parts
(B). Passive Dissemination
(1). By Air
(2). By Water
(3). By Vectors
(4). By Humans
Thank You