Abstract
Drought is the main factor that significantly affects plant growth and has devastating effects on crop production of jute. NAC (NAM, ATAF, and CUC2) transcription factors (TFs) are a large gene family in plants that have been shown to play many important roles in regulating developmental processes and abiotic stress resistance. In this study, a NAC transcription factor, CcNAC1, was cloned and characterized its function in jute. RT-qPCR analysis showed that CcNAC1 expression peaks after 8 h of drought stress. CcNAC1 overexpression and knockdown plants were created by Agrobacterium-mediated genetic transformation. PCR and southern hybridization results indicate that the CcNAC1 gene was integrated into the genome of jute. Overexpression of the CcNAC1 gene sped up the plant growth, promoted early flowering, and increased drought tolerance compared to the control plants. 3-Ketoacyl-CoA synthase (KCS) gene expression level increased significantly in the CcNAC1-overexpression plants and decreased in knockdown plants, which showed that CcNAC1 transcription factor regulated KCS gene expression. Yeast-2-Hybrid (Y2H) assays validated the physical interaction between CcNAC1 and KCS. The results provide relatively comprehensive information on the molecular mechanisms of CcNAC1 gene underlying the regulation of plant growth and drought stress resistance, and indicate that CcNAC1 acts as a positive regulator in drought tolerance in jute (Corchorus capsularis L.).
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Acknowledgments
We would like to deeply thank Jiantang Xu for their constructive guidance and discussions, and Jie Chen for valuable proofreading and language-polishing services.
Funding
This work was supported by grants from the National Science Foundation of China (grant no. 31860396) in the design of the study and data collection and the Key Laboratory of Fiber Biology of the Chinese Academy of Agricultural Sciences (grant number 201602) and the Science and Technology Project of the Education Department of Jiangxi Province (grant nos. GJJ161047 and GJJ180890) for the analysis and interpretation of data and preparation of the manuscript.
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GY, SS, and DF conceived the research plan, analyzed the data, and wrote the manuscript. ZC, JL, and YW analyzed the function of NAC1. JM and SL did the qPCR and vector construction. All authors read and approved the final manuscript.
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Zhang, G., Huang, S., Zhang, C. et al. Overexpression of CcNAC1 gene promotes early flowering and enhances drought tolerance of jute (Corchorus capsularis L.). Protoplasma 258, 337–345 (2021). https://doi.org/10.1007/s00709-020-01569-y
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DOI: https://doi.org/10.1007/s00709-020-01569-y