plant defences passive Flashcards
what is a passive defence
defences present before infection of pathogen/ prevent the entry of pathogen
What acronym helps remember all the plant passive defences
Cool- Cellulose Cell wall
Cats- callose
Like- Lignin thickening
When- Waxy cuticle
Birds- Bark
Stand - Stomatal closure
Tall- Tylose
what is a callose
what is a tylose
callose- large polysaccharide which is deposited in sieve tubes blocking flow and prevents spread of pathogen
Tylose- Balloon like swelling filling the xylem to stop it carrying water, prevents the spread of pathogens in water.
how do these functions prevent pathogens
-cell wall
-lignin
-stomatal closure
Cellulose cell wall- physical barrier and contains chemical defences which activate when pathogen is detected
Lignin- indigestable and waterproof
Stomata- Guard cells close stomata when pathogens are detected near by
How do these features of passive defence prevent pathogen
Waxy cuticle
bark
Bark- contains chemical defences
Waxy cuticle- prevents water collecting on leaf, pathogens need water to survive, therefore cant enter due to lack of water