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GmWRKY27 interacts with GmMYB174 to reduce expression of GmNAC29 for stress tolerance in soybean plants

文献类型： 外文期刊

作者： Wang, Fang 1 ; Chen, Hao-Wei 1 ; Li, Qing-Tian 1 ; Wei, Wei 1 ; Li, Wei 2 ; Zhang, Wan-Ke 1 ; Ma, Biao 1 ; Bi, Ying-Dong; 1 ;

作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Gen, Beijing 100101, Peoples R China

2.Heilongjiang Acad Agr Sci, Inst Crop Tillage & Cultivat, Harbin 150086, Heilongjiang, Peoples R China

3.Heilongjiang Acad Agr Sci,

关键词： soybean;transcription factor;stress tolerance;root

期刊名称：PLANT JOURNAL （ 2020影响因子：6.417； 五年影响因子：7.627 ）

ISSN：

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收录情况： SCI

摘要： Soybean (Glycine max) is an important crop for oil and protein resources worldwide. The molecular mechanism of the abiotic stress response in soybean is largely unclear. We previously identified multiple stress-responsive WRKY genes from soybean. Here, we further characterized the roles of one of these genes, GmWRKY27, in abiotic stress tolerance using a transgenic hairy root assay. GmWRKY27 expression was increased by various abiotic stresses. Over-expression and RNAi analysis demonstrated that GmWRKY27 improves salt and drought tolerance in transgenic soybean hairy roots. Measurement of physiological parameters, including reactive oxygen species and proline contents, supported this conclusion. GmWRKY27 inhibits expression of a downstream gene GmNAC29 by binding to the W-boxes in its promoter region. The GmNAC29 is a negative factor of stress tolerance as indicated by the performance of transgenic hairy roots under stress. GmWRKY27 interacts with GmMYB174, which also suppresses GmNAC29 expression and enhances drought stress tolerance. The GmWRKY27 and GmMYB174 may have evolved to bind to neighbouring cis elements in the GmNAC29 promoter to co-reduce promoter activity and gene expression. Our study discloses a valuable mechanism in soybean for regulation of the stress response by two associated transcription factors. Manipulation of these genes should facilitate improvements in stress tolerance in soybean and other crops.

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