Plant Defences Against Pathogens (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Two categories of plant defences
Two categories of plant defences
Passive and active
When passive defences operate
When passive defences operate
Always/continuously present
Casparian strip material
Casparian strip material
Waterproof suberin
Tannins function
Tannins function
Block cellulases & pathogen enzymes
Hypersensitivity response
Hypersensitivity response
Rapid programmed cell death around infection
Callose glycosidic bonds
Callose glycosidic bonds
β-1,3 & some β-1,6
Callose effect on plasmodesmata
Callose effect on plasmodesmata
Reduces diameter, limits virus spread
Tyloses
Tyloses
Physical blockages in xylem vessels
Phytoalexins
Phytoalexins
Antimicrobial defence chemicals
Systemic acquired resistance signals
Systemic acquired resistance signals
Salicylic acid & ethylene