数字农科院2.0

Overexpression of ZmEXPA5 reduces anthesis-silking interval and increases grain yield under drought and well-watered conditions in maize

文献类型： 外文期刊

作者： Keyu Tao;Yan Li;Yue Hu;Yongxiang Li;Dengfeng Zhang;Chunhui Li;Guanhua He;Yanchun Song;Yunsu Shi;Yu Li;Tianyu Wang;Yuncai Lu;Xuyang Liu

作者机构：

关键词： Anthesis-silking interval;Drought;Expansin;Maize (Zea mays L.);ZmEXPA5

期刊名称： Molecular Breeding

ISSN： 1380-3743

年卷期： 2023 年 43 卷 12 期

页码：

收录情况： SCIE（2023版）

摘要： Drought is one of the major abiotic stresses affecting the maize production worldwide. As a cross-pollination crop, maize is sensitive to water stress at flowering stage. Drought at this stage leads to asynchronous development of male and female flower organ and increased interval between anthesis and silking, which finally causes failure of pollination and grain yield loss. In the present study, the expansin gene ZmEXPA5 was cloned and its function in drought tolerance was characterized. An indel variant in promoter of ZmEXPA5 is significantly associated with natural variation in drought-induced anthesis-silking interval. The drought susceptible haplotypes showed lower expression level of ZmEXPA5 than tolerant haplotypes and lost the cis-regulatory activity of ZmDOF29. Increasing ZmEXPA5 expression in transgenic maize decreases anthesis-silking interval and improves grain yield under both drought and well-watered environments. In addition, the expression pattern of ZmEXPA5 was analyzed. These findings provide insights into the genetic basis of drought tolerance and a promising gene for drought improvement in maize breeding.

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