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

CONSTANS-LIKE 7 regulates branching and shade avoidance response in Arabidopsis.
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CONSTANS-LIKE 7 调节拟南芥的分枝和避荫反应

DOI:
10.1093/jxb/ers376
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发表时间:
2013-02
影响因子:
6.9
通讯作者:
Liu B
Liu B
中科院分区:
生物学1区
文献类型:
--
作者:
Wang H;Zhang Z;Li H;Zhao X;Liu X;Ortiz M;Lin C;Liu B

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分枝是受环境信号调控的植物发育的重要特征。拟南芥中的光敏色素参与红光:远红光比(R:FR)的变化,其机制尚不清楚。结果表明,Constans-like 7(COL7)的过表达导致了丰富的分枝表型,这种表型可以被遮荫或模拟遮荫环境(低R:FR)有效地抑制。此外,与野生型相比,在低R:FR条件下,COL7突变体的下胚轴较短,而COL7高表达系的下胚轴较长,这表明COL7是遮荫回避反应的增强子。在遮荫或短暂的低R:FR中,COL7的转录和转录后表达水平上调,并与遮荫回避综合征(SAS)的标记基因光敏色素相互作用因子3样蛋白1(PIL1)的mRNA快速积累呈正相关。综上所述,这些结果表明COL7具有双重作用,它在高R:FR条件下促进分枝,但在低R:FR条件下增强SAS。
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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