W55a Encodes a Novel Protein Kinase That Is Involved in Multiple Stress Responses

文献类型： 外文期刊

第一作者： Xu, Zhao-Shi

作者： Xu, Zhao-Shi;Liu, Li;Ni, Zhi-Yong;Liu, Pei;Chen, Ming;Li, Lian-Cheng;Ma, You-Zhi;Liu, Li;Chen, Yao-Feng

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关键词： environment stress;cold stress;multiple stress response

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

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收录情况： SCI

摘要： Protein kinases play crucial roles in response to external environment stress signals. A putative protein kinase, W55a, belonging to SNF1-related protein kinase 2 (SnRK2) subfamily, was isolated from a cDNA library of drought-treated wheat seedlings. The entire length of W55a was obtained using rapid amplification of 5' cDNA ends (5'-RACE) and reverse transcription-polymerase chain reaction(RT-PCR). It contains a 1 029 -bp open reading frame (ORF) encoding 342 amino acids. The deduced amino acid sequence of W55a had eleven conserved catalytic subdomains and one Ser/Thr protein kinase active-site that characterize Ser/Thr protein kinases. Phylogenetic analysis showed that W55a was 90.38% homologous with rice SAPK1, a member of the SnRK2 family. Using nullisomic-tetrasomic and ditelocentric lines of Chinese Spring, W55a was located on chromosome 2BS. Expression pattern analysis revealed that W55a was upregulated by drought and salt, exogenous abscisic acid, salicylic acid, ethylene and methyl jasmonate, but was not responsive to cold stress. In addition, W55a transcripts were abundant in leaves, but not in roots or stems, under environmental stresses. Transgenic Arabidopsis plants overexpressing W55a exhibited higher tolerance to drought. Based onthese findings, W55a encodes a novel dehydration-responsive protein kinase that is involved in multiple stress signal transductions.

分类号： Q94

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