Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2
Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2
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DOI：
10.1073/pnas.95.5.2686
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发表时间：
1998-03-03
影响因子：
11.1
通讯作者：
Cashmore, AR
中科院分区：
文献类型：
--
作者：
Lin, CT;Yang, HY;Cashmore, AR
隐花色素是一组调节植物生长发育的黄素类蓝光受体。本研究以拟南芥隐花色素2（cryptochrome 2）为材料，以过量表达cryptochrome 2蛋白的转基因植株和不积累cryptochrome 2蛋白的cry 2突变体为材料，研究了隐花色素2在幼苗早期光形态建成中的作用。研究发现隐花色素2介导蓝光-在低强度蓝光下依赖性抑制下胚轴伸长和刺激子叶开放，与BX 1相反，蓝光以光强度依赖的方式快速下调隐花色素2的表达，这提供了一种分子机制，至少部分地解释了隐花色素2在幼苗早期发育过程中主要在弱光下起作用。
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.