光形态发生
光敏色素
拟南芥
光敏色素A
下胚轴
细胞生物学
蓝光
苗木
化学
生物
植物
生物化学
基因
红灯
物理
突变体
光学
作者
Xiaolin Jia,Meifang Song,Shaoci Wang,Tong Liu,Lijian Wang,Lin Guo,Li‐Hua Su,Yong Shi,Zheng Xu,Jianping Yang
摘要
In Arabidopsis, although studies have demonstrated that phytochrome A (phyA) and phyB are involved in blue light signaling, how blue light-activated phytochromes modulate the activity of the CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)-SUPPRESSOR OF PHYA-105 (SPA1) E3 complex remains largely unknown. Here, we show that phyA responds to early and weak blue light, whereas phyB responds to sustainable and strong blue light. Activation of both phyA and phyB by blue light inhibits SPA1 activity. Specifically, blue light irradiation promoted the nuclear import of both phytochromes to stimulate their binding to SPA1, abolishing SPA1's interaction with LONG HYPOCOTYL 5 (HY5) to release HY5, which promoted seedling photomorphogenesis.
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