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Overexpression of the PP2A-C5 gene confers increased salt tolerance in Arabidopsis thaliana

文献类型： 外文期刊

作者： Hu, Rongbin 1 ; Zhu, Yinfeng 1 ; Shen, Guoxin 2 ; Zhang, Hong 1 ;

作者机构： 1.Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA

2.Zhejiang Acad Agr Sci, Hangzhou, Zhejiang, Peoples R China

关键词： Chloride channel protein;protein phosphatase 2A;salt stress;signaling

期刊名称：PLANT SIGNALING & BEHAVIOR （ 影响因子：2.247； 五年影响因子：2.369 ）

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收录情况： SCI

摘要： Protein phosphatase 2A (PP2A) was shown to play important roles in biotic and abiotic stress signaling pathways in plants. PP2A is made of 3 subunits: a scaffolding subunit A, a regulatory subunit B, and a catalytic subunit C. It is believed that theB subunit recognizes specific substrates and the C subunit directly acts on the selected substrates, whereas the A subunit brings a B subunit and a C subunit together to form a specific PP2A holoenzyme. Because there are multiple isoforms for each PP2A subunit, there could be hundreds of novel PP2A holoenzymes in plants. For an example, there are 3 A subunits, 17 B subunits, and 5 C subunits in Arabidopsis, which could form 255 different PP2A holoenzymes. Understanding the roles of these PP2A holoenzymes in various signaling pathways is a challenging task. In a recent study,1 we discovered that PP2A-C5, the catalytic subunit 5 of PP2A, plays an important role in salt tolerance in Arabidopsis. We found that a knockout mutant of PP2A-C5 (i.e. pp2a-c5-1)was very sensitive to salt treatments, whereas PP2A-C5-overexpressing plants were more tolerant to salt stresses. Genetic analyses between pp2a-c5-l and Salt-Overly-Sensitive (SOS) mutants indicated that PP2A-C5 does not function in the same pathway as SOS genes. Using yeast 2-hybrid analysis, we found that PP2A-C5 interacts with several vacuolar membrane bound chloride channel proteins. We hypothesize that these vacuolar chloride channel proteins might be PP2A-C5's substrates in vivo, and the action ofPP2A-C5 on these channel proteins could increase or activate their activities, thereby result in accumulation of the chloride and sodium contents in vacuoles, leading to increased salt tolerance in plants.

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[1]Overexpression of AtPTPA in Arabidopsis increases protein phosphatase 2A activity by promoting holoenzyme formation and ABA negatively affects holoenzyme formation. Chen, Jian,Zhu, Xunlu,Zhang, Hong,Shen, Guoxin. 2015

[2]Ameliorative effects of inoculation with the plant growth-promoting rhizobacterium Pseudomonas sp. DW1 on growth of eggplant (Solanum melongena L.) seedlings under salt stress. Fu, Qinglin,Liu, Chen,Ding, Nengfei,Lin, Yicheng,Guo, Bin. 2010

[3]Suppression of OsVPE3 Enhances Salt Tolerance by Attenuating Vacuole Rupture during Programmed Cell Death and Affects Stomata Development in Rice. Lu, Wenyun,Guo, Fu,Wang, Mingqiang,Zeng, Zhanghui,Han, Ning,Yang, Yinong,Zhu, Muyuan,Bian, Hongwu,Deng, Minjuan,Yang, Yinong,Yang, Yinong. 2016

[4]Over-expression of a C3H-type zinc finger gene contributes to salt stress tolerance in transgenic broccoli plants. Jiang, Ming,He, Cai-Ming,Jiang, Jing-Jing,Miao, Li-Xiang.

[5]Co-overexpressing a Plasma Membrane and a Vacuolar Membrane Sodium/Proton Antiporter Significantly Improves Salt Tolerance in Transgenic Arabidopsis Plants. Pehlivan, Necla,Sun, Li,Jarrett, Philip,Mishra, Neelam,Zhang, Hong,Yang, Xiaojie,Chen, Lin,Shen, Guoxin,Kadioglu, Asim.

[6]Inoculation response of mycorrhizas on morphology and physiological behaviour of trifoliate orange (Poncirus trifoliata) roots under salt stress. Wang, Peng,Srivastava, A. K.,Zhang, Yi-Can,Wu, Qiang-Sheng,Srivastava, A. K.,Wu, Qiang-Sheng.

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