Biological function of calcium-sensing receptor (CAS) and its coupling calcium signaling in plants
Bin Li, Liyuan Hou, Chenggang Song, Zhengbiao Wang, Qiyang Xue, Yuanyang Li, Jianchun Qin, Ning Cao, Chengguo Jia, Yubin Zhang, Wuliang Shi
Abstract
The calcium-sensing receptor (CAS), as a chloroplast thylakoid membrane protein, is involved in the process of external Ca2+-induced cytosolic Ca2+ increase in plants. However, the underlying mechanism regulating this process is lacking. Furthermore, recent evidence suggests that CAS may perform additional roles in plants. Here, we provided an update covering the multiple roles of CAS in stomatal movement regulation and Ca2+ signaling in plants. We also analyzed the possible phosphorylation mechanism of CAS by light and discuss the role of CAS in abiotic stress (drought, salt stress) and biotic stresses (plant immune signaling). Finally, we proposed a perspective for future experiments that are required to fill gaps in our understanding of the biological function of CAS in plants.