Seasonal drought promotes citrate accumulation in citrus fruit through the CsABF3-activated CsAN1-CsPH8 pathway
文献类型： 外文期刊
第一作者： Ma, Xiaochuan
作者： Ma, Xiaochuan;Sheng, Ling;Zhou, Tie;Guo, Jing;Chang, Yuanyuan;Yang, Junfeng;Jin, Yan;Chen, Yuewen;Lu, Xiaopeng;Ma, Xiaochuan;Sheng, Ling;Zhou, Tie;Guo, Jing;Chang, Yuanyuan;Yang, Junfeng;Jin, Yan;Chen, Yuewen;Lu, Xiaopeng;Li, Feifei
作者机构： Hunan Agr Univ, Coll Hort, Changsha 410128, Peoples R China;Natl Ctr Citrus Improvement, Changsha 410128, Peoples R China;Inst Hort, Hunan Acad Agr Sci, Changsha 410125, Peoples R China
关键词： abscisic acid (ABA); citrate; citrus; CsABF3; CsAN1; CsPH8; drought stress; transcriptional regulation
期刊名称：NEW PHYTOLOGIST （ 2022影响因子：9.4； 五年影响因子：10.5 ）
ISSN： 0028-646X
年卷期： 2024 年 242 卷 3 期
收录情况： SCI
摘要： Plenty of rainfall but unevenly seasonal distribution happens regularly in southern China. Seasonal drought from summer to early autumn leads to citrus fruit acidification, but how seasonal drought regulates citrate accumulation remains unknown. Herein, we employed a set of physiological, biochemical, and molecular approaches to reveal that CsABF3 responds to seasonal drought stress and modulates citrate accumulation in citrus fruits by directly regulating CsAN1 and CsPH8. Here, we demonstrated that irreversible acidification of citrus fruits is caused by drought lasting for > 30 d during the fruit enlargement stage. We investigated the transcriptome characteristics of fruits affected by drought and corroborated the pivotal roles of a bHLH transcription factor (CsAN1) and a P-3A-ATPase gene (CsPH8) in regulating citrate accumulation in response to drought. Abscisic acid (ABA)-responsive element binding factor 3 (CsABF3) was upregulated by drought in an ABA-dependent manner. CsABF3 activated CsAN1 and CsPH8 expression by directly and specifically binding to the ABA-responsive elements (ABREs) in the promoters and positively regulated citrate accumulation. Taken together, this study sheds new light on the regulatory module ABA-CsABF3-CsAN1-CsPH8 responsible for citrate accumulation under drought stress, which advances our understanding of quality formation of citrus fruit.
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