Abstract
DELLAs are known as negative regulators of gibberellin (GA) signaling pathway and control many aspects of plant development. In recent years, DELLA family genes were widely studied in many plant species, but little was known about the biological functions of DELLA genes in cucumber. In this study, genome-wide identification of the DELLA gene family members was performed (CsDELLA1–4), and their phylogenetic relationship, conserved motif, gene structure, cis-regulatory elements, and expression pattern were systematically analyzed. Amongst them, CsDELLA1 encoded a protein-harbored DGLLA, LERLE, and less-conserved TVHYNP motif in its N-terminal DELLA domain, implying the possible role of CsDELLA1 in GA-regulated growth and development. As anticipated, silenced CsDELLA1 by virus-induced gene silencing resulted in increased plant height and early flowering phenotypes. In contrast, overexpression of CsDELLA1 in Arabidopsis resulted in dwarf, late flowering, and inhibited hypocotyl elongation phenotypes, indicating that overexpression of CsDELLA1 inhibited the GA response in Arabidopsis. The transgenic plants also produced more buds and shorter siliques than the wild-type (WT) plants, and displayed a significantly longer primary root length than that of WT under exogenous GA3 treatment. Collectively, these results indicated that the CsDELLA1 might play important roles in regulation of GA-mediated growth and development.
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Acknowledgements
This work was supported by the Academic and Technical Leader Plan of Jiangxi Provincial Main Disciplines (20204BCJ22023), the National Natural Science Foundation of China (32160709), and the earmarked fund for Innovation team of Jiangxi Agricultural University (JXAUCXTD009).
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JC, YH, and LX completed the experiments; YZ, ZH, and YLZ analyzed the data; YZ wrote the manuscript; SL designed of experimental work, reviewed and edited the manuscript.
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Zhou, Y., Chen, J., Hu, Y. et al. Comprehensive Survey of the DELLA Transcription Factors in Cucumber and Functional Characterization of CsDELLA1 in Regulation of GA-Mediated Growth and Development. J Plant Growth Regul (2024). https://doi.org/10.1007/s00344-024-11308-9
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DOI: https://doi.org/10.1007/s00344-024-11308-9