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4.1 Plant defences

non-obvious plant defences

Terpenoids Essential oils. antibiotic and anti-fungal properties (oi= oils)
Defensins anti-microbial proteins that appear to act on plasma membranes of pathogens
Phenols Ie tannins found in bark. bind to salivary proteins and digestive enzymes, deactivating them. (phenols= because the bugs "feel ill")
Alkaloids nitrogen-rich compounds with bitter taste. Nicotine, morphine, caffeine (BC ALK is like alcohol which is drug)
Hydrolytic enzymes examples Ie. chitinases, glucanases, lysozomes
necrosis deliberate cell suicide
canker sunken necrotic lesion in woody tissue. Can cause death of cambium in bark
callose deposited in phloem sieve tube elements
tylose balloon-like swelling that fills the xylem vessel
oxidative bursts (active) produce highly reactive oxygen molecules that can damage cells of invading organisms
Created by: BadhA2013