- Cell enlargment/growth by vacuolation & elongation (acid growth hypothesis)
- Tropism (photo/geo)
- Stimulate production of meristem - callus tissue at injury
- Apical dorminance / Inhibit lateral bud
- Induce root initiation
- Promote fruit growth (parthenocarpy)
- Inhibit abscission in leaves & flowers
- Inhibit auxiliary bud growth - potato tube
- Defoliation - increase 2,4,5 trichlorophenoxyacetic acid - Vietnam war - fall of leaves
- Weed killer
- Promote stem elongation
- Breaks dormancy in seed & buds - winter
- Promote fruiting & parthenocarpy
- Inhibit apical dominance - promote side shoot growth
- Promote flowering in long day plants
- Strengthen stem of wheat - bigger grapes , stimulate amylase production in barley (commercial)
- Promote cell division only if have auxin
- Delay senescense (aging) in leaves
- Inhibit apical dominance - lateral buds
- Inhibit lateral roots
- Prolong leafy vegetable storage, cut flower fresh, germination in seed
- Promotes dormancy in buds & seeds
- Antagonise effect of auxin, GA & cytokinin - inhibit growth of stem & root
- Promotes leaf fall (autumn) (inhibit synthesis of RNA, DNA - induce senescence & yellowing)
- Closure of stomata (stress condition, X water)
- Use comercially to drop fruits (cherry)
- Inhibit growth of stem & root
- Promote ripening of fruits
- Breaks bud dormancy
- Promote defoliation
- Promote etiolation / yellowing of plants (when shaded)
- Induced flowering & fruiting in pineapples, ripening of tomatoes & citrus fruits (commercial)
Apical / Apex Dominance
- Auxin - promote, inhibit lateral buds
- Gibberellins - enhance IAA
- Kinetin breaks dormancy temporarily
- Kinetin & IAA - break dormancy completely
- Gibberellins & cytokinns enhance each other (suppress apical dominance)
- Auxin promote lateral roots & supperss apical dominance (antoginase with cytokinins)
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