向光性
嗜光蛋白
生物
生长素
隐色素
细胞生物学
拟南芥
植物
光强度
生物物理学
蓝光
生物化学
光学
物理
突变体
基因
生物钟
作者
Christian Fankhauser,John M. Christie
出处
期刊:Current Biology
[Elsevier]
日期:2015-05-01
卷期号:25 (9): R384-R389
被引量:126
标识
DOI:10.1016/j.cub.2015.03.020
摘要
Plants are photoautotrophic sessile organisms that use environmental cues to optimize multiple facets of growth and development. A classic example is phototropism - in shoots this is typically positive, leading to growth towards the light, while roots frequently show negative phototropism triggering growth away from the light. Shoot phototropism optimizes light capture of leaves in low light environments and hence increases photosynthetic productivity. Phototropins are plasma-membrane-associated UV-A/blue-light activated kinases that trigger phototropic growth. Light perception liberates their protein kinase domain from the inhibitory action of the amino-terminal photosensory portion of the photoreceptor. Following a series of still poorly understood events, phototropin activation leads to the formation of a gradient of the growth hormone auxin across the photo-stimulated stem. The greater auxin concentration on the shaded compared with the lit side of the stem enables growth reorientation towards the light. In this Minireview, we briefly summarize the signaling steps starting from photoreceptor activation until the establishment of a lateral auxin gradient, ultimately leading to phototropic growth in shoots.
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