Week 4 - ABA-Ethylene

Question 1

functions of ABA

Answer 1

storage protein synthesis in seeds
promotes seed desiccation and dormancy
delays flowering time
promotes stomatal closure, root growth under water stress and defence

Question 2

Biosynthesis of GA, ABA and BR

Answer 2

all of them are terpenes, polymers of a 5 carbon unit called isoprene

Question 3

developmental effect of ABA

Answer 3

seed maturation
stomatal closure
promotes root growth /inhibits shoot growth at low water potential
promotes leaf senescence

Question 4

ABAs main role?

Answer 4

to maintain water balance and osmotic stress tolerance

Question 5

ABA and GA FFFFFFuckin hate each other, why?

Answer 5

Because ABA represses many of the genes GA turns on and vice versa

Question 6

ABA and GA ratios do what

Answer 6

high ABA:GA = promotes dormancy and opposes germination
low ABA:GA = the opposite

Question 7

The triple response

Answer 7

consists of slowing stem elongation, thickening of the stem and horizontal growth

Question 8

why is ABA produced

Answer 8

its produced in response to drought, flooding, injury and infection