Imaizumi Takato, Schroeder Julian I, Kay Steve A
Department of Biochemistry, Scripps Research Institute, La Jolla, CA 92037, USA.
Sci STKE. 2007 Jun 12;2007(390):pe32. doi: 10.1126/stke.3902007pe32.
Many stimuli induce short-term increases in the cytosolic concentration of free calcium ions (Ca(2+)) that encode signaling information about diverse physiological and developmental events. Slow cytosolic Ca(2+) oscillations that span an entire day have also been discovered in both plants and animals; it is thought that these daily Ca(2+) oscillations may encode circadian clock signaling information. A recent study focusing on the characterization of the extracellular Ca(2+)-sensing receptor (CAS) has provided insight into the molecular mechanisms by which the daily Ca(2+) oscillation in plants is generated. We summarize the major findings regarding daily oscillations of cytosolic Ca(2+) concentrations in plants and animals, and discuss hypothetical biological roles for the circadian clock-regulated physiology in plants.
许多刺激会导致游离钙离子（Ca(2+)）的胞质浓度短期升高，这些钙离子编码有关各种生理和发育事件的信号信息。在植物和动物中都发现了持续一整天的缓慢胞质Ca(2+)振荡；据认为，这些每日Ca(2+)振荡可能编码生物钟信号信息。最近一项专注于细胞外Ca(2+)-传感受体（CAS）特性表征的研究，为植物中每日Ca(2+)振荡产生的分子机制提供了见解。我们总结了关于植物和动物中胞质Ca(2+)浓度每日振荡的主要发现，并讨论了生物钟调节的生理学在植物中的假设生物学作用。
