CONSTANS-LIKE 7 regulates branching and shade avoidance response in Arabidopsis

文献类型： 外文期刊

第一作者： Wang, Honggui

作者： Wang, Honggui;Zhao, Xiaoying;Liu, Xuanming;Zhang, Zenglin;Li, Hongyu;Liu, Bin;Wang, Honggui;Ortiz, Michael;Lin, Chentao

作者机构：

关键词： Branching;COL7;light signal transduction;phytochrome B;PIL1;shade avoidance response

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2013 年 64 卷 4 期

页码：

收录情况： SCI

摘要： Branching is an important trait of plant development regulated by environmental signals. Phytochromes in Arabidopsis mediate branching in response to the changes in the red light:far-red light ratio (R:FR), the mechanisms of which are still elusive. Here it is shown that overexpression of CONSTANS-LIKE 7 (COL7) results in an abundant branching phenotype which could be efficiently suppressed by shade or a simulated shade environment (low R:FR). Moreover, col7 mutants develop shorter hypocotyls and COL7 overexpression lines develop longer hypocotyls in comparison with the wild type in low R:FR, indicating that COL7 acts as an enhancer of the shade avoidance response. In shade or transient low R:FR, transcriptional and post-transcriptional expression levels of COL7 are up-regulated and positively associated with rapid mRNA accumulation of PHYTOCHROME INTERACTING FACTOR 3-LIKE 1 (PIL1), a marker gene of shade avoidance syndrome (SAS). Taken together, the results suggest a dual role for COL7 which promotes branching in high R:FR conditions but enhances SAS in low R:FR conditions.

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