Inhibition of shoot branching by new terpenoid plant hormones
Inhibition of shoot branching by new terpenoid plant hormones
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DOI：
10.1038/nature07272
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发表时间：
2008-09-11
期刊：
影响因子：
64.8
通讯作者：
Yamaguchi, Shinjiro
中科院分区：
文献类型：
--
作者：
Umehara, Mikihisa;Hanada, Atsushi;Yamaguchi, Shinjiro
枝梢分枝是植物构型的主要决定因素，并受内源和环境因素的高度调节。两类激素，生长素和细胞分裂素，长期以来一直被认为在控制枝条分枝中起重要作用。先前的研究使用了一系列具有增强的枝条分支的突变体，表明存在来自类胡萝卜素的第三类激素，但其化学身份尚不清楚。在这里，我们表明，独脚金内酯，一组萜类内酯的水平，显着减少在一些分支突变体。此外，独脚金内酯的应用抑制了这些突变体中的芽分枝。独脚金内酯以前被发现在根分泌物作为通信化学物质与寄生杂草和共生丛枝菌根真菌。因此，我们提出独脚金内酯作为一种新的激素类-或它们的生物合成前体-在调节地上植物结构中起作用，并且在与其他邻近生物的地下通信中也具有功能。
Shoot branching is a major determinant of plant architecture and is highly regulated by endogenous and environmental cues. Two classes of hormones, auxin and cytokinin, have long been known to have an important involvement in controlling shoot branching. Previous studies using a series of mutants with enhanced shoot branching suggested the existence of a third class of hormone( s) that is derived from carotenoids, but its chemical identity has been unknown. Here we show that levels of strigolactones, a group of terpenoid lactones, are significantly reduced in some of the branching mutants. Furthermore, application of strigolactones inhibits shoot branching in these mutants. Strigolactones were previously found in root exudates acting as communication chemicals with parasitic weeds and symbiotic arbuscular mycorrhizal fungi. Thus, we propose that strigolactones act as a new hormone class - or their biosynthetic precursors - in regulating above- ground plant architecture, and also have a function in underground communication with other neighbouring organisms.