Hi everyone,hope you all fine and safe.Today I will share with you information about the growth hormone of plant known as Auxins.
•Auxin is derived from Greek word Auxein which means to grow.
•Darwin and it's son Francis Darwin observed coloeptiles of canary monocot grass bend towards unilateral source of lights.
Source:https://images.app.goo.gl/ji27G32a3GEhbvrNA
Test by Darwin and his son.
•F.W.went isolated auxin from coloeptiles of oat Seedlings.
•F.W.went do avena curvature test.
•Auxin first isolated from human urine.
Procusur
Tryptophan in presence of Zn+.
•It is acidic in nature.
•Natural Auxins are:
IAA(INDOLE ACETIC ACID)
IBA(INDOLE BUTERIC ACID)
•Synthetic Auxins are:
NAA(NATHALINE ACETIC ACID)
2,4 diclorophenlxy acitic acid
*2,4 diclorophenlxy acitic acid and 2,4,5 teiclorophenoxy acitic acid are used by US army during VITMAN WAR to deplocate forest so as to locate enemies.
Let's look its physiological effects:
•It is extensively used in agriculture and hoticulture practices.
•Initiate rooting in stem cutting.
•Promotes flowering in pine apple.
•Prevents fruit and leaf drop at early stages but promotes abscission in older leaves and fruits.
•Promotes apical dominance i.e;Apical but inhibits growth of lateral bud.
•2,4 diclorophenlxy acitic acid used kills the dicord weed and this used to prepare free lawns.
Source:https://images.app.goo.gl/xUP2EoZU9Re9eGjQ9
Hormone function.
•Control xylem differentiation and cell division.
•Responsible for phototropism and geotropism.
I hope it is usefull Information for you.
Thanks for reading.