蓝光受体隐花色素2增强拟南芥幼苗对蓝光的敏感性。
Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2.
作者信息
Lin C, Yang H, Guo H, Mockler T, Chen J, Cashmore A R
机构信息
Department of Molecular, Cell and Developmental Biology, and Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA.
出版信息
Proc Natl Acad Sci U S A. 1998 Mar 3;95(5):2686-90. doi: 10.1073/pnas.95.5.2686.
Abstract
Cryptochrome is a group of flavin-type blue light receptors that regulate plant growth and development. The function of Arabidopsis cryptochrome 2 in the early photomorphogenesis of seedlings was studied by using transgenic plants overexpressing CRY2 protein, and cry2 mutant plants accumulating no CRY2 protein. It is found that cryptochrome 2 mediates blue light-dependent inhibition of hypocotyl elongation and stimulation of cotyledon opening under low intensities of blue light. In contrast to CRY1, the expression of CRY2 is rapidly down-regulated by blue light in a light-intensity dependent manner, which provides a molecular mechanism to explain at least in part that cryptochrome 2 functions primarily under low light during the early development of seedlings.
摘要
隐花色素是一类黄素型蓝光受体，可调节植物的生长和发育。通过使用过表达CRY2蛋白的转基因植物以及不积累CRY2蛋白的cry2突变体植物，研究了拟南芥隐花色素2在幼苗早期光形态建成中的功能。研究发现，在低强度蓝光下，隐花色素2介导蓝光依赖性的下胚轴伸长抑制和子叶张开刺激。与CRY1不同，CRY2的表达会被蓝光以光强度依赖性方式快速下调，这提供了一种分子机制，至少部分解释了隐花色素2在幼苗早期发育过程中主要在弱光下发挥作用的原因。
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