PHOTOTROPISM: TRANSLATING LIGHT INTO DIRECTIONAL GROWTH
PHOTOTROPISM: TRANSLATING LIGHT INTO DIRECTIONAL GROWTH
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DOI：
10.3732/ajb.1200299
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发表时间：
2013-01-01
影响因子：
3
通讯作者：
Fankhauser, Christian
中科院分区：
文献类型：
--
作者：
Hohm, Tim;Preuten, Tobias;Fankhauser, Christian
趋光性允许植物将它们的光合作用组织与入射的光对准。入射光的方向是由蓝光感受器的趋光素家族(拟南芥中的Pho1和Pho2)感知的，它们是光激活的蛋白激酶。趋光素的激酶活性及其激活环中残基的磷酸化对于趋光性反应是必不可少的。这些最初的步骤触发了下胚轴生长素梯度的形成，从而导致不对称生长。光感受器激活和生长反应之间的分子事件才刚刚开始阐明。在这篇综述中，我们讨论了从光感知到定向生长的主要步骤，主要集中在拟南芥。此外，我们强调了连接这些不同步骤的链接，从而实现了光致反应。
Phototropism allows plants to align their photosynthetic tissues with incoming light. The direction of incident light is sensed by the phototropin family of blue light photoreceptors (phot1 and phot2 in Arabidopsis), which are light-activated protein kinases. The kinase activity of phototropins and phosphorylation of residues in the activation loop of their kinase domains are essential for the phototropic response. These initial steps trigger the formation of the auxin gradient across the hypocotyl that leads to asymmetric growth. The molecular events between photoreceptor activation and the growth response are only starting to be elucidated. In this review, we discuss the major steps leading from light perception to directional growth concentrating on Arabidopsis. In addition, we highlight links that connect these different steps enabling the phototropic response.