CBL1, a Calcium Sensor That Differentially Regulates Salt, Drought, and Cold Responses in Arabidopsis

拟南芥 突变体 细胞生物学 生物 调节器 信号转导 转基因 耐旱性 基因 基因表达 钙信号传导 植物 生物化学 化学 有机化学
作者
Yong Hwa Cheong,Kyung‐Nam Kim,Girdhar K. Pandey,Rajeev Gupta,John J. Grant,Sheng Luan
出处
期刊:The Plant Cell [Oxford University Press]
卷期号:15 (8): 1833-1845 被引量:411
标识
DOI:10.1105/tpc.012393
摘要

Although calcium is a critical component in the signal transduction pathways that lead to stress gene expression in higher plants, little is known about the molecular mechanism underlying calcium function. It is believed that cellular calcium changes are perceived by sensor molecules, including calcium binding proteins. The calcineurin B–like (CBL) protein family represents a unique group of calcium sensors in plants. A member of the family, CBL1, is highly inducible by multiple stress signals, implicating CBL1 in stress response pathways. When the CBL1 protein level was increased in transgenic Arabidopsis plants, it altered the stress response pathways in these plants. Although drought-induced gene expression was enhanced, gene induction by cold was inhibited. In addition, CBL1-overexpressing plants showed enhanced tolerance to salt and drought but reduced tolerance to freezing. By contrast, cbl1 null mutant plants showed enhanced cold induction and reduced drought induction of stress genes. The mutant plants displayed less tolerance to salt and drought but enhanced tolerance to freezing. These studies suggest that CBL1 functions as a positive regulator of salt and drought responses and a negative regulator of cold response in plants.
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