Ability of plants to synthesise cyanogenic glycosides which liberate HCN
1 of 20
Whats HCN
Hydrogen Cyanide
2 of 20
Latin name of plant which is cyanogenetic?
Trifolium repens
3 of 20
What does gene Ac control?
Production of substrate linamarin (or Cyanogenic glycosides)
4 of 20
What does gene Li control?
Production on enzyme linamarse ( hydrolyses substrate)
5 of 20
How does production of HCN work?
Hydrolysis is strictly controlled by compartmentation of glycosidase enzyme (in cell walls) and its substrate within plant cell, when damage to cell, enzyme and substrate come together
6 of 20
When is HCN in its highest concentrations?
In Seedlings
7 of 20
How many species contain cyanogens?
800
8 of 20
How does HCN work?
Inhibits cytochrome binding, so cells can't utilize oxygen
9 of 20
Explain the temperature link?
In cold, herbivores are hibernating and frost damage can cause the release, so selected against
10 of 20
How to detect cyanogenesis?
Leaf+Water+ Toluene + Crush + Picric Acid paper dipped in NaxCO3 and incubate
11 of 20
Chi squared formula
(0-E) squared/E
12 of 20
Cyanogenesis in Lotus? (lotus corniculatus)
Yes in all wild one tested, none in cultivated
13 of 20
Cyanogenesis in Clover?
Mostly no indoor population, Yes in Outdoors
14 of 20
Comment on 2 trends in anti microbial effects of herbs/spices
Chilli, Mahonia, Horseradish had no effect, Eucalyptus and clove strong effect
15 of 20
Herb/Spice effect of gram -ve bacteria?
Gram -ve bacteria are more resistant to effects, meaning gram +ve more susceptible
16 of 20
Defining co-evolutionary theory
A biological objects change triggered by a change in related object (Speices)
Comments
No comments have yet been made