Gibberellin. plant growth regulator which enhances growth of plant
1. Gibberellin
Endogenous plant growth regulator / promotor
Discovery- 1st discovered from fungus Giberella fujikorai
by Japnese scientist Kurosawa. He perform an expt. on
rice
Appication-
1. Stimulate internode elongation
2. Break seed and bud dormancy
( germination in dark, alpha amylase)
3. Increase size of leaves
4. Induction of parthenocarpy (without
fertilization, seed less fruit and increase in size
of fruit)
5. Delay in senescence of leaf and citrus
fruit(Orange / lemon)
6. Promote bolting and flowering long day
plants
7. Lower dose increase production of 2nd ry
metabolite cardiac glycoside / shoot.
8. Increase production of digoxin in
leaf and root culture of digitalis
9. Increase volatile content
10. Promote fruit growth
11. Delay in fruit maturity/ ripning
12. Increase in fruit size
Present in young shoot, root, embryo, germinating seed
GA1, GA2, GA3… GAn
