摘要
光和温度是影响种子休眠与萌发的两个重要的环境因子。光敏色素(PHY)是光和温度的受体,本文将围绕PHY展开,对种子休眠与萌发的光温敏感性和光温信号通路进行综述。作为光受体, PHYA和PHYB是调控种子萌发的两个关键PHY蛋白,它们通过调节光敏色素互作蛋白(PIF1)的降解,来解除受PIF1抑制的植物激素脱落酸(ABA)和赤霉素(GA)代谢和信号基因的表达,从而控制ABA和GA的水平和信号来调控种子萌发。作为温度受体, PHYB是调控种子萌发的关键PHY蛋白。温度信号调控活性PHYB到非活性PHYB的转变速率,每日温度循环促进PHYB调节的种子萌发。在发现PHY为光温二受体后,其整合光温信号调控种子休眠与萌发将成为今后的一个研究热点。
Light and temperature are two important environmental factors in regulating seed dormancy and germination.Phytochromes(PHYs)are receptors for both light and temperature.In this paper,the photothermal sensitivity and signal pathway mediated by PHY during seed dormancy and germination were reviewed.As the light sensors,PHYA and PHYB are key photochromic regulators during seed germination which can promote the degradation of photochrome interaction factor 1(PIF1),resulting in the release of genes involved in abscisic acid(ABA)and gibberellin(GA)metabolism and signal transduction to regulate seed germination by altering level and signal of them.As a temperature sensor,PHYB might be the unique phytochrome to regulate seed germination.The conversion rate from active PHYB to inactive PHYB is regulated by temperature signal,and the daily temperature cycle promotes PHYB-mediated seed germination.The photothermal signal pathway integrated by phytochrome(as the sensors of light and temperature)during seed dormancy and germination would become a hot topic in the future.
作者
李振华
徐如宏
任明见
李鲁华
LI Zhen-Hua;XU Ru-Hong;REN Ming-Jian;LI Lu-Hua(Guizhou Sub-center of National Wheat Improvement Center,College of Agronomy,Guizhou University,Guiyang 550025,China)
出处
《植物生理学报》
CAS
CSCD
北大核心
2019年第5期539-546,共8页
Plant Physiology Journal
基金
国家自然科学基金(31860420和31660390)
国家重点研发计划“七大农作物育种”重点专项(2017YFD0100900)
贵州省科技计划项目(黔科合平台人才[2018]5781号)
贵州省自然科学基金(黔科合基础[2019]1069)
贵州大学引进人才科研项目[贵大人基合字(2018)37号]~~
关键词
光敏色素
种子休眠
种子萌发
光温敏感性
光温信号
phytochrome
seed dormancy
seed germination
photothermal sensitivity
photothermal signal
