ZmbZIP27 regulates nitrogen-mediated leaf angle by modulating lignin deposition in maize

文献类型： 外文期刊

第一作者： Chen, Huan

作者： Chen, Huan;Gong, Xiaoping;Guo, Yu;Li, Wen-Xue;Du, Qingguo;Chen, Huan;Yu, Jingjuan

作者机构：

关键词： Maize; Nitrogen; Leaf angle; Ligular region; Lignin deposition

期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）

ISSN： 2095-5421

年卷期： 2024 年 12 卷 5 期

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收录情况： SCI

摘要： In grain crops such as maize (Zea mays), leaf angle (LA) is a key agronomic trait affecting light interceptionand thus planting density and yield. Nitrogen (N) affects LA in plants, but we lack a good understanding ofhow N regulates LA. Here, we report that N deficiency enhanced lignin deposition in the ligular region ofmaize seedlings.In situhybridization showed that the bZIP transcription factor geneZmbZIP27is mainlyexpressed in the phloem of maize vascular bundles. Under N-sufficient conditions, transgenic maize over-expressingZmbZIP27showed significantly smaller LA compared with wild type (WT). By contrast,zm-bzip27emsmutant showed larger LA under both N-deficient and N-sufficient conditions compared withWT. Overexpression ofZmbZIP27enhanced lignin deposition in the ligular region of maize in the field.We further demonstrated that ZmbZIP27 could directly bind the promoters of the microRNA genesZmMIR528aandZmMIR528band negatively regulate the expression levels of ZmmiR528. ZmmiR528knockdown transgenic maize displayed erect architecture in the field by increasing lignin content inthe ligular region of maize. Taken together, these results indicate thatZmbZIP27regulates N-mediatedLA size by regulating the expression of ZmmiR528 and modulating lignin deposition in maize. (c) 2024 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting byElsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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