32. Host Pathogen Relationship.pdf

Host Pathogen Relationship

1. ByBy
Hem Hem ChanderChander
Assistant Professor (Botany)Assistant Professor (Botany)
Career Point University Career Point University HamirpurHamirpur(HP) 176041(HP) 176041
[email protected]@gmail.com

2. Plants have natural interactions with bacteria, fungi, nematodes,
and possibly parasitic plants (stariga, casccutaetc).
They may be inoculated with viruses during feeding by insects or
by other vectors (insects/pest, water, air, humans etc).
Plant pathogens have made many adaptations to enable them to
invade plants, overcome plant defense mechanisms, and colonize
plant tissues for growth, survival, and reproduction
.
plant tissues for growth, survival, and reproduction
.
Pathogens accomplish these activities mostly through secretions of
chemical substances that affect certain components or metabolic
mechanisms of their hosts.
Penetration and invasion, however, seem to be aided by or in some
cases be entirely the result of, the mechanical force exerted by
certain pathogens on the cell walls of the plant.

9. Defense system in Plants