Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidase activity
Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidase activity
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DOI：
10.1101/gad.432607
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发表时间：
2007-08-01
影响因子：
10.5
通讯作者：
Ruberti, Ida
中科院分区：
文献类型：
--
作者：
Carabelli, Monica;Possenti, Marco;Ruberti, Ida
生长在树冠下的植物将红光(R)与远红光(FR)比率的降低视为竞争的警告，并促进伸长生长，试图过度生长它的邻居。在这里，我们报告了诱导下胚轴伸长的低R/FR信号也触发了叶原基生长的快速停止，确保植物资源被重新引导到伸展生长。低R/FR诱导的生长停滞依赖于生长素诱导的细胞分裂素在发育原基的初生脉细胞中的分解，从而证明了植物对树冠遮荫的反应存在一个先前未知的调节电路。
A plant grown under canopies perceives the reduction in the ratio of red (R) to far-red (FR) light as a warning of competition, and enhances elongation growth in an attempt to overgrow its neighbors. Here, we report that the same low R/FR signal that induces hypocotyl elongation also triggers a rapid arrest of leaf primordium growth, ensuring that plant resources are redirected into extension growth. The growth arrest induced by low R/FR depends on auxin-induced cytokinin breakdown in incipient vein cells of developing primordia, thus demonstrating the existence of a previously unrecognized regulatory circuit underlying plant response to canopy shade.