TaMYB44-5A reduces drought tolerance by repressing transcription of TaRD22-3A in the abscisic acid signaling pathway.

IF 3.6 3区 生物学 Q1 PLANT SCIENCES
Planta Pub Date : 2024-07-13 DOI:10.1007/s00425-024-04485-0
De Peng, Liqun Li, Aosong Wei, Ling Zhou, Bingxin Wang, Mingliu Liu, Yanhong Lei, Yanzhou Xie, Xuejun Li
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Abstract

Main conclusion: TaMYB44-5A identified as a transcription factor negatively regulates drought tolerance in transgenic Arabidopsis. Drought can severely reduce yields throughout the wheat-growing season. Many studies have shown that R2R3-MYB transcription factors are involved in drought stress responses. In this study, the R2R3-MYB transcription factor MYB44-5A was identified in wheat (Triticum aestivum L.) and functionally analyzed. Three homologs of TaMYB44 were isolated, all of which localized to the nucleus. Overexpression of TaMYB44-5A reduced drought tolerance in Arabidopsis thaliana. Further analysis showed that TaMYB44-5A reduced the sensitivity of transgenic Arabidopsis to ABA. Genetic and transcriptional regulation analyses demonstrated that the expression levels of drought- and ABA-responsive genes were downregulated by TaMYB44-5A, and TaMYB44-5A directly bound to the MYB-binding site on the promoter to repress the transcription level of TaRD22-3A. Our results provide insights into a novel molecular pathway in which the R2R3-MYB transcription factor negatively regulates ABA signaling in response to drought stress.

Abstract Image

TaMYB44-5A 通过抑制脱落酸信号通路中 TaRD22-3A 的转录来降低耐旱性。
主要结论:在转基因拟南芥中,TaMYB44-5A 被鉴定为负调控抗旱性的转录因子。干旱会使整个小麦生长季节的产量严重下降。许多研究表明,R2R3-MYB 转录因子参与了干旱胁迫反应。本研究鉴定了小麦(Triticum aestivum L.)中的 R2R3-MYB 转录因子 MYB44-5A,并对其进行了功能分析。分离出了 TaMYB44 的三个同源物,它们都定位于细胞核。过表达 TaMYB44-5A 会降低拟南芥的耐旱性。进一步的分析表明,TaMYB44-5A 降低了转基因拟南芥对 ABA 的敏感性。遗传和转录调控分析表明,TaMYB44-5A 下调了干旱和 ABA 响应基因的表达水平,TaMYB44-5A 直接与启动子上的 MYB 结合位点结合,抑制了 TaRD22-3A 的转录水平。我们的研究结果揭示了 R2R3-MYB 转录因子在干旱胁迫下负向调控 ABA 信号转导的新分子途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Planta
Planta 生物-植物科学
CiteScore
7.20
自引率
2.30%
发文量
217
审稿时长
2.3 months
期刊介绍: Planta publishes timely and substantial articles on all aspects of plant biology. We welcome original research papers on any plant species. Areas of interest include biochemistry, bioenergy, biotechnology, cell biology, development, ecological and environmental physiology, growth, metabolism, morphogenesis, molecular biology, new methods, physiology, plant-microbe interactions, structural biology, and systems biology.
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