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Manipulating ZmEXPA4 expression ameliorates the drought-induced prolonged anthesis and silking interval in maize

文献类型： 外文期刊

作者： Liu, Boxin 1 ; Zhang, Bin 1 ; Yang, Zhirui 3 ; Liu, Yan 3 ; Yang, Shiping 3 ; Shi, Yunlu 3 ; Jiang, Caifu 3 ; Qin, Feng 3 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, Key Lab Plant Mol Physiol, Beijing 100093, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.China Agr Univ, Coll Biol Sci, State Key Lab Plant Physiol & Biochem, Beijing 100193, Peoples R China

4.Beijing Acad Agr & Forestry Sci BAAFS, Beijing Vegetable Res Ctr BVRC, Beijing 100097, Peoples R China

5.China Agr Univ, Ctr Crop Funct Genom & Mol Breeding, Beijing 100193, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）

ISSN： 1040-4651

年卷期： 2021 年 33 卷 6 期

页码：

收录情况： SCI

摘要： Drought poses a major environmental threat to maize (Zea mays) production worldwide. Since maize is a monoecious plant, maize grain yield is dependent on the synchronous development of male and female inflorescences. When a drought episode occurs during flowering, however, an asynchronism occurs in the anthesis and silking interval (ASI) that results in significant yield losses. The underlying mechanism responsible for this asynchronism is still unclear. Here, we obtained a comprehensive development-drought transcriptome atlas of maize ears. Genes that function in cell expansion and growth were highly repressed by drought in 50mm ears. Notably, an association study using a natural-variation population of maize revealed a significant relationship between the level of alpha-expansin4 (ZmEXPA4) expression and drought-induced increases in ASI. Furthermore, genetic manipulation of ZmEXPA4 expression using a drought-inducible promoter in developing maize ears reduced the ASI under drought conditions. These findings provide important insights into the molecular mechanism underlying the increase in ASI in maize ears subjected to drought and provide a promising strategy that can be used for trait improvement.

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