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They are all organic compounds, they may resemble molecules which turn up elsewhere in plant structure or function, but they are not directly involved as nutrients or metabolites.
Hormone Source Action
Auxins apical meristem (only moves down),
embryo of seed,
young leaves ? Control of cell elongation
? apical dominance (prevents lateral buds)
? prevents abscission
? continued growth of fruit
? cell division in vascular and cork cambium
--formation of lateral roots from pericycle
--formation of adventitious roots from cuttings
Gibberellins Roots and young leaves ? Cell (stem) elongation (works in stems and leaves, but not roots)
? breaking seed/bud dormancy
? stimulating fruit set
Cytokinins roots, embryos, fruits
actively growing ? Promote cell division
--signal axillary/lateral bud growth
--prevent leaf abscission
? chloroplast development
? breaking dormancy in some seeds
? enhance flowering
? promote fruit development
Abscissic Acid leaves, stems, green fruit ? Reduces cell division (helps maintain dormancy of seeds and buds)
? prepare plants for winter
1...
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