BIOL 1010 Chapter Notes - Chapter 24: Axillary Bud, Apical Dominance, Auxin
14 May 2017
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Thus, the direct inhibition hypothesis does not account for all experimental findings, ad it is likely that plant biologists have no uncovered all the pieces of this puzzle. The role of the plant hormones in apical dominance remains an area of active research. Gibberellins affect stem elongation and have numerous effects. In 1920s, japanese scientists discovered that a fungus of the genus gibberella caused this (cid:862)foolish seedling disease(cid:863). Roots and young leaves are major sites of gibberellin production. One of the main effects of gibberellins is to stimulate late cell elongation and cel division in stems and leaves. This action generally enhances that of auxin and can be demonstrated when certain dwarf plant varieties grow to normal height after treatment with gibberellins. Gibberellin-induced stem elongation can also cause bolting, the rapid growth of a loral stalk. Bolting can frustrate gardeners because it often renders the plant unpalatable.
