Strigolactone inhibition of shoot branching
Strigolactone inhibition of shoot branching
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DOI：
10.1038/nature07271
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发表时间：
2008-09-11
期刊：
影响因子：
64.8
通讯作者：
Rochange, Soizic F.
中科院分区：
文献类型：
--
作者：
Gomez-Roldan, Victoria;Fermas, Soraya;Rochange, Soizic F.
一种由类胡萝卜素产生的激素信号抑制了植物的枝条分枝，但长期以来一直没有被发现。Strigollacone是一种化合物，被认为是从类胡萝卜素中提取的，已知可以触发寄生植物种子的萌发，并刺激共生真菌。在这里，我们提出的证据表明，豌豆类胡萝卜素裂解双加氧酶8分枝突变体缺乏马立内酯，应用马立内酯可以将野生型分枝表型恢复为ccd8突变体。此外，我们发现以前被描述为缺乏对分枝抑制信号的反应的其他分枝突变体也缺乏马立内酯反应，并且不缺乏马立内酯。这些反应在拟南芥中是保守的。与激素信号的预期特性一致，外源斯特里内酯可以在芽中运输，并在低浓度下起作用。我们认为内源植物内酯或相关化合物抑制植物的枝条分枝。此外，ccd8突变体在枝条分枝、菌根共生和寄生杂草相互作用中表现出不同的作用。
A carotenoid- derived hormonal signal that inhibits shoot branching in plants has long escaped identification. Strigolactones are compounds thought to be derived from carotenoids and are known to trigger the germination of parasitic plant seeds and stimulate symbiotic fungi. Here we present evidence that carotenoid cleavage dioxygenase 8 shoot branching mutants of pea are strigolactone deficient and that strigolactone application restores the wild- type branching phenotype to ccd8 mutants. Moreover, we show that other branching mutants previously characterized as lacking a response to the branching inhibition signal also lack strigolactone response, and are not deficient in strigolactones. These responses are conserved in Arabidopsis. In agreement with the expected properties of the hormonal signal, exogenous strigolactone can be transported in shoots and act at low concentrations. We suggest that endogenous strigolactones or related compounds inhibit shoot branching in plants. Furthermore, ccd8 mutants demonstrate the diverse effects of strigolactones in shoot branching, mycorrhizal symbiosis and parasitic weed interaction.