ALBA3 maintains male fertility under heat stress in plants

文献类型： 外文期刊

第一作者： Ci, Dong

作者： Ci, Dong;Ci, Dong;Wang, Lishuan;Zhu, Ruixian;Qian, Weiqiang;Liu, Yi;Fan, Liu-Min;Chen, Yong;Bai, Ge;Qian, Weiqiang;Xu, Ziyan;Zhou, Huanbin;Zhou, Xueping;Xu, Ziyan;Zhou, Xueping

作者机构：

关键词： Alba domain; heat stress; male fertility; pollen; RNA stability

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.3； 五年影响因子：10.8 ）

ISSN： 1672-9072

年卷期： 2025 年 67 卷 5 期

页码：

收录情况： SCI

摘要： Heat stress (HS) at the reproductive stage detrimentally affects crop yields and seed quality. However, the molecular mechanisms that protect reproductive processes in plants under HS remain largely unknown. Here, we report that Acetylation Lowers Binding Affinity 3 (ALBA3) is crucial for safeguarding male fertility against HS in Arabidopsis. ALBA3 is highly expressed in pollen, and ALBA3 is localized in the cytoplasm of both sperm and vegetative cells. Mutants lacking functional ALBA3 exhibit hypersensitivity to HS, with reduced silique length and fertility due to defects in pollen germination, pollination, pollen tube growth, and fertilization under HS. ALBA3 binds and stabilizes a subset of messenger RNAs (mRNAs) essential for pollen function, thereby protecting male fertility. Two residues in the Alba domain, K46 and L90, are critical for ALBA3's ability to bind and stabilize mRNAs and are necessary for its proper function. Interestingly, the loss of rice ALBA3 also leads to severe pollen abortion and male sterility under HS, highlighting the conserved role of ALBA3 in protecting male fertility across plant species. This study uncovers a conserved mechanism by which ALBA3 safeguards male fertility during HS by stabilizing specific mRNAs crucial for pollen function.

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