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__________ PLANT GROWTH AND DEVELOPMENT__________
-:phytohormone-those chemical substances, which regulate the growth of the plants.
#category of plant hormone:
1)Indole compounds- indole acetic acid(IAA)
2)Adenine derivatives
3)Cartoonist derivatives-abscisic acid(ABA)
4)Terpenes-gibberellic acid(mainly GA3)
5)Gases-Ethylene(C2H4)
#On the basis of their functions:
*They divided into two category:-
1)AUXIN,GIBBERELLINS,CYTOKINEN, ETHYLENE - (promote growth)
2)ABA-(inhibits growth)
*AUXIN-Acidic, cell elongation and initiation of roots.
*Gibberellins- (acidic) elongation off genetically dwarf plants and elongation of internodes.
*Cytokinen- (basic) promotes cell division and reduce apical dominance.
*Ethylene-(acidic) horizontal growth of seedlings/ripping of the fruits.
*ABA-(acidic)(stress hormone)regulate abscission , growth inhibition and bud dormancy and induces stomatal closure.
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