Potential interaction between autophagy and auxin during maize leaf senescence

文献类型： 外文期刊

第一作者： Feng, Xue

作者： Feng, Xue;Liu, Lili;Li, Zhigang;Sun, Fang;Wu, Xiaoyuan;Hao, Huaiqing;Jing, Hai-Chun;Feng, Xue;Liu, Lili;Li, Zhigang;Sun, Fang;Jing, Hai-Chun;Hao, Dongyun;Jing, Hai-Chun

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关键词： Autophagy and auxin pathways; interaction; leaf senescence; maize yield; population genetics; transcriptomic profiling

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2021 年 72 卷 10 期

页码：

收录情况： SCI

摘要： Leaf senescence is important for crop yield as delaying it can increase the average yield. In this study, population genetics and transcriptomic profiling were combined to dissect its genetic basis in maize. To do this, the progenies of an elite maize hybrid Jidan27 and its parental lines Si-287 (early senescence) and Si-144 (stay-green), as well as 173 maize inbred lines were used. We identified two novel loci and their candidate genes, Stg3 (ZmATG18b) and Stg7 (ZmGH3.8), which are predicted to be members of autophagy and auxin pathways, respectively. Genomic variations in the promoter regions of these two genes were detected, and four allelic combinations existed in the examined maize inbred lines. The Stg3(Si-144)/Stg7(Si-1)(44) allelic combination with lower ZmATG18b expression and higher ZmGH3.8 expression could distinctively delay leaf senescence, increase ear weight and the improved hybrid of NIL-Stg3(Si-144)/Stg7(Si-1)(44) significantly reduced ear weight loss under drought stress, while opposite effects were observed in the Stg3(Si-)(287)/Stg7(Si-)(287) combination with a higher ZmATG18b expression and lower ZmGH3.8 expression. Thus, we identify a potential interaction between autophagy and auxin which could modulate the timing of maize leaf senescence.

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