各就各位，预备，跑！一次糖分冲击开启了向分支生长冲刺的进程。

Ready, steady, go! A sugar hit starts the race to shoot branching.

作者信息

Barbier François F, Lunn John E, Beveridge Christine A

机构信息

School of Biological Sciences, and The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4072, Australia.

Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.

出版信息

Curr Opin Plant Biol. 2015 Jun;25:39-45. doi: 10.1016/j.pbi.2015.04.004. Epub 2015 May 15.

DOI:10.1016/j.pbi.2015.04.004

PMID:25938609

Abstract

In the classical theory of apical dominance, auxin depletion from the stem releases bud dormancy. Recent studies have revealed a poor correlation between the initial bud release and auxin depletion from the stem after decapitation. Sucrose mobility in plants and its accumulation in buds correlates well with the onset of bud release and is able to trigger bud outgrowth. The diversion of sugars away from axillary buds decreases bud release even where hormones are at levels generally considered conducive to bud release. This impact of sugars on bud outgrowth may be mediated by specific sugar and hormonal signalling pathways.

摘要

在经典的顶端优势理论中，茎中生长素的减少会解除芽的休眠。最近的研究表明，去顶后最初的芽解除休眠与茎中生长素的减少之间相关性较差。植物中蔗糖的移动性及其在芽中的积累与芽解除休眠的开始密切相关，并且能够触发芽的生长。即使在激素水平通常被认为有利于芽解除休眠的情况下，糖分从腋芽的转移也会减少芽的解除休眠。糖分对芽生长的这种影响可能是由特定的糖和激素信号通路介导的。