Chemical Plant Defences
- Created by: Bhansongal98
- Created on: 23-02-16 19:29
View mindmap
- Chemical Plant Defences
- Terpenoids
- range of essential oils
- Have antibiotic and antifungal properties
- Create scent e.g. menthols in mint plants
- Phenols
- Antibiotic & antifungal
- Tannins in bark
- inhibit insect attacks
- prevent damage which could allow pathogens entry
- bind to insect salivary proteins and digestive enzymes
- e.g. chymotrypsin & trypsin
- insects that ingest too much do not grow and eventually die
- inhibit insect attacks
- Alkaloids
- Nitrogen compounds e.g. caffeine & nicotine
- Bitter taste to herbivores
- Reduced grazing
- less damage suffered which could allow pathogens in
- Reduced grazing
- Affect metabolic reactions
- inhibits / activates enzyme action
- Defensins (defensive proteins)
- cysteine-rich proteins with broad anti-microbial activity
- act upon molecules in the cell membrane of pathogens
- inhibit the action of ion transport channels
- Hydrolytic Enzymes
- Found in spaces between cells
- e.g. chitinases
- break down chitin in fungal cell walls
- e.g. glucanases
- hydrolyse glycosidic bonds in glucans
- e.g. lysozymes
- degrade bacterial cell walls
- Terpenoids
Comments
Report