CIPK9:: a calcium sensor-interacting protein kinase required for low-potassium tolerance in Arabidopsis

被引:110
作者
Pandey, Girdhar K. [1 ]
Cheong, Yong Hwa [1 ]
Kim, Beom-Gi [1 ]
Grant, John J. [1 ]
Li, Legong [1 ]
Luan, Sheng [1 ]
机构
[1] Univ Calif Berkeley, Dept Plant & Microbiol Biol, Berkeley, CA 94720 USA
关键词
calcium; calcineurin-B like protein; protein kinase; potassium nutrition; signal transduction;
D O I
10.1038/cr.2007.39
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Potassium is one of the major macro-nutrients essential for a number of cellular processes in plants. Low potassium level in the soil represents a limiting factor for crop production. Recent studies have identified potassium transporters that are involved in potassium acquisition, and some of them are critical for potassium nutrition under low potassium conditions. However, little is understood on the molecular components involved in low potassium signaling and responses. We report here the identification of a calcineurin B-like protein-interacting protein kinase (CIPK9) as a critical regulator of low potassium response in Arabidopsis. The CIPK9 gene was responsive to abiotic stress conditions, and its transcript was inducible in both roots and shoots by potassium deprivation. Disruption of CIPK9 function rendered the mutant plants hypersensitive to low potassium media. Further analysis indicated that K+ uptake and content were not affected in the mutant plants, implying CIPK9 in the regulation of potassium utilization or sensing processes.
引用
收藏
页码:411 / 421
页数:11
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