2020 年 60 巻 2 号 p. 098-101
Temperate plants enhance their freezing tolerance before winter to survive in freezing environment. Plants use the cytosolic transient Ca2+ concentration change as a kind of signal to regulate gene expression in cold acclimation process. We developed the experimental system for observation of Ca2+ signal during cooling, and observed Ca2+ signal to understand “how plants sense cold and seasonal changes.” We found several characteristics of Ca2+ signal and cold sensing. For example, plants adjust the Ca2+ signal to the ambient temperature to response small temperature decrease, and then small temperature fluctuation induces the cold-inducive transcription factor DREB1/CBFs expression via Ca2+ signals.