NtPHYB1与光温信号互作调控烟草种子萌发

李振华, 王显亚, 刘一灵, 赵杰宏

NtPHYB1 interacts with light and temperature signal to regulate seed germination in Nicotiana tabacum L.

LI Zhen-Hua, WANG Xian-Ya, LIU Yi-Ling, ZHAO Jie-Hong

图2 光敏色素整合光温信号调控种子萌发响应季节变化 粉色模块是指暴露在地表的种子, 灰色模块是指埋在土壤中的种子。在冬季和早春(<15℃), 光敏色素感知低温信号抑制种子萌发, 而光信号的作用微乎其微。在晚春早秋(约20℃), 温度信号独立激活光敏色素促进种子萌发。在夏季和初秋(>30℃), 光是维持光敏色素活性和促进种子萌发所必需的。

Fig. 2 Diagram of phytochrome B integrates light and temperature signal to regulate seed germination in different seasons The pink block are seeds exposed to the ground, while the grey blocks are seeds buried underground. represents quick, slow, and obstructive conversions. In winter and early spring (<15℃), the low-temperature signal sensed by phytochrome B inhibited seeds germination, and the effect of the light signal was almost ineffective. During late spring and autumn (~20℃), temperature signal initiated germination with the combination of the light. In summer and early autumn (>30℃), light is indispensable to maintain seed germination by persistently activating the PHYB.