A Growing Stem Inhibits Bud Outgrowth – The Overlooked Theory of Apical Dominance
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چکیده
منابع مشابه
A Growing Stem Inhibits Bud Outgrowth – The Overlooked Theory of Apical Dominance
Three theories of apical dominance, direct, diversion, and indirect, were proposed in the 1930s to explain how auxin synthesized in the shoot apex might inhibit axillary bud outgrowth, and thus shoot branching. The direct and diversion theories of apical dominance have been investigated in detail, and they are replaced with the current auxin transport canalization and second messenger theories,...
متن کاملApical dominance models can generate basipetal patterns of bud activation
An important aspect of plant development is the order in which lateral buds are activated to produce branches. This order may manifest itself, for example, in the gradient of branch lengths, or in the flowering sequence. One progression type is acropetal, with the lateral buds activated from the bottom up. Other plants exhibit a basipetal sequence of bud activation, with a downward progression ...
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Clusters of cytoplasmic vesicles resembling those in growing hyphal apices of mycelial fungi are found near the tips of buds in three heterobasidiomycetous yeasts, Rhodotorula glutinis, Candida scottii, and Sporobolomyces salmonicolor.
متن کاملSugar demand, not auxin, is the initial regulator of apical dominance.
For almost a century the plant hormone auxin has been central to theories on apical dominance, whereby the growing shoot tip suppresses the growth of the axillary buds below. According to the classic model, the auxin indole-3-acetic acid is produced in the shoot tip and transported down the stem, where it inhibits bud growth. We report here that the initiation of bud growth after shoot tip loss...
متن کاملStrigolactone acts downstream of auxin to regulate bud outgrowth in pea and Arabidopsis.
During the last century, two key hypotheses have been proposed to explain apical dominance in plants: auxin promotes the production of a second messenger that moves up into buds to repress their outgrowth, and auxin saturation in the stem inhibits auxin transport from buds, thereby inhibiting bud outgrowth. The recent discovery of strigolactone as the novel shoot-branching inhibitor allowed us ...
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ژورنال
عنوان ژورنال: Frontiers in Plant Science
سال: 2017
ISSN: 1664-462X
DOI: 10.3389/fpls.2017.01874