title: The Arabidopsis Ca²⁺-dependent protein kinase CPK27 is required for plant response to salt-stress.
abstract: Ca(2+)-dependent protein kinases (CDPKs) play vital roles in plant adaptations to environmental challenges. The precise regulatory mechanism of CDPKs in mediating salt stress still remains unclear, although several CDPK members have been identified to be involved in salt stress accumulation in various plants, such as Arabidopsis thaliana and Oryza sativa. Here, we investigated the function of an Arabidopsis CDPK, CPK27, in salt stress-signaling. CPK27 is a membrane-localized protein kinase; its expression was induced by NaCl. cpk27-1, a T-DNA insertion mutant of CPK27, was much more sensitive to salt stress than wild-type plants in terms of seed germination and post-germination seedling growth. In ion-flux assay, cpk27-1 mutants exhibited a lower capacity than wild-type plants to extrude Na(+) and import H(+) after a long-term salt treatment (110mM NaCl for 10days). Moreover, the content of Na(+) was higher and K(+) was lower in cpk27-1 mutants than in wild-type plants under salt stress. In addition, the level of salt-elicited H2O2 production was higher in cpk27-1 mutants than in wild-type plants Col after a short-term NaCl shock and long-term salt treatment. Collectively, our results suggest that CPK27 is required for plant adaptation to salt stress.
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: ruizhao926@126.com.
authors: Rui
authors: R
authors: Zhao
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: sunhuimin1126@126.com.
authors: Huimin
authors: H
authors: Sun
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: zhaonan19880921@126.com.
authors: Nan
authors: N
authors: Zhao
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: johncy@126.com.
authors: Xiaoshu
authors: X
authors: Jing
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: xinshen77@126.com.
authors: Xin
authors: X
authors: Shen
authors: College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: lschen@bjfu.edu.cn.
authors: Shaoliang
authors: S
authors: Chen
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002118:Calcium / Q000378:metabolism*; D004269:DNA, Bacterial / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D018525:Germination / Q000235:genetics / Q000502:physiology; D012275:Oryza / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D011494:Protein Kinases / Q000378:metabolism*; D036226:Seedlings / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D012964:Sodium / Q000378:metabolism; D012965:Sodium Chloride / Q000378:metabolism*; D013312:Stress, Physiological / Q000235:genetics / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; D004269:DNA, Bacterial; C036483:T-DNA; D012965:Sodium Chloride; D012964:Sodium; D011494:Protein Kinases; D002118:Calcium
keywords: Arabidopsis thaliana; Ca(2+)-dependent protein kinase; H(2)O(2) accumulation; Ion homeostasis; Salt stress