Abstract
Key message
GbWRKY1 can function as a negative regulator of ABA signaling via JAZ1 and ABI1, with effects on salt and drought tolerance.
Abstract
WRKY transcription factors play important roles in plant development and stress responses. GbWRKY1 was initially identified as a defense-related gene in cotton and negatively regulates the response to fungal pathogens by activating the expression of JAZ1. Here, we characterized the role of GbWRKY1, an orthologue of the Arabidopsis gene AtWRKY75, in abiotic stress (salt and drought) and established novel connection between JAZ1 and ABA signaling in Arabidopsis. GbWRKY1 is nucleus localized and its expression is significantly induced by treatment with ABA and osmotic stresses NaCl and PEG. Increased levels of expression of GbWRKY1 in transgenic Arabidopsis enhance sensitivity to salt and drought as revealed by seed germination tests and soil stress experiments. Similarly, GbWRKY1 overexpression cotton plants also display increased sensitivity to PEG treatment and drought. Expression analysis shows that the induction of two ABA responsive genes, RAB18 and RD29A by NaCl, mannitol, and ABA treatment is significantly impaired in GbWRKY1 overexpression Arabidopsis lines. GbWRKY1 overexpression Arabidopsis displays a strong ABA-insensitive phenotype at both germination and early stages of seedling development. Further genetic evidence suggested that the ABA-insensitive phenotype of GbWRKY1 overexpression Arabidopsis was dependent on JAZ1, and overexpression of JAZ1 also displayed an ABA-insensitive phenotype. In addition, yeast two hybrid and bimolecular fluorescence complementation assays showed that JAZ1 directly interacts with ABI1, a key negative regulator of ABA signaling. We, therefore, demonstrate that GbWRKY1 acts as a negative regulator of ABA signaling, through an interaction network involving JAZ1 and ABI1, to regulate salt and drought tolerance.
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Acknowledgments
We thank Prof. Keith Lindsey (Durham University) for critical suggestions on manuscript revision. We are grateful to Huazhi Song and De Zhu (National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University) for confocal imaging, and Pengcheng Wang (National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University) for providing the CRISPR vector. We thank Prof. Sheng Luan and Dr. Congcong Hou (University of California, Berkeley) for providing pDONR221-P1P4, pDONR221-P3P2, pBIFCt-2in1-NN, and pFRETgc-2in1-NN plasmids.
Funding
This work was financially supported by the National Natural Science Foundation of China (31471541) and the National Key Project of Research and Development (2018YFD0100403).
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XZ, LZ, and XL conceived and designed research. XL conducted experiments and wrote the manuscript. CL generated GbWRKY1 transgenic materials. XH gave constructive suggestions on stress experiments. LZ revised the manuscript. All authors read and approved the manuscript.
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Communicated by Chun-Hai Dong.
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Luo, X., Li, C., He, X. et al. ABA signaling is negatively regulated by GbWRKY1 through JAZ1 and ABI1 to affect salt and drought tolerance. Plant Cell Rep 39, 181–194 (2020). https://doi.org/10.1007/s00299-019-02480-4
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DOI: https://doi.org/10.1007/s00299-019-02480-4