PGRS|AUXINS&GIBBERLINS |IMPORTANTS &APPLICATIONS IN MALAYALAM FOR KERALA PLUSONE SCERT|NCERT
Channel: Trick Teacher
Date: 08/08/2020

NOTES ON THIS TOPIC
PHYSIOLOGICAL EFFECTS OF PLANT GROWTH REGULATORS
Auxins

IAA and indole butyric acid (IBA) have been isolated from plants and NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.
They help to initiate rooting in stem cuttings, promote flowering, prevent fruit and leaf drop at early stages, induce parthenocarpy (example- tomato).
In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance.
Auxins are widely used as herbicides.Example- 2, 4-D is widely used to kill dicotyledonous weeds.

Gibberellins

Gibberellins are denoted as GA1, GA2, GA3.
All gibberellins are acidic.
They help to increase in length of axis, elongate and improve shape of fruits, delay senescence,
Spraying juvenile conifers with GAs hastens the maturity period, thus leading to early seed production.
Gibberellins also promotes bolting, defined as internode elongation just prior to flowering, in beet, cabbages.


Join our watsapp group 
plusone students:https://chat.whatsapp.com/FWjdvnwm8MrHZteExMEYbz
plus two students:https://chat.whatsapp.com/HtHMwdb8SB3KoEWLoxNjhr