Transcriptomic and metabolic changes during tassel branching development in maize

文献类型： 外文期刊

第一作者： Tai, Yuxin

作者： Tai, Yuxin;Cheng, Zixiang;Xu, Zhennan;Li, Mingshun;Hao, Zhuanfang;Zhang, Degui;Yong, Hongjun;Zhou, Zhiqiang;Han, Jienan;Li, Xinhai;Weng, Jianfeng;Lyu, Xiangling;Pan, Feng;Meng, Lingzhi

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关键词： Auxin; Maize; Metabolome; Tassel branch number; Transcriptome

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1471-2229

年卷期： 2025 年 25 卷 1 期

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收录情况： SCI

摘要： BackgroundTassel branch number shapes plant architecture, which is crucial for maize adaptation to high-density planting. Therefore, unrevealing the molecular mechanisms of tassel branching is essential for crop breeding. To gain better insights into this mechanism, we integrated metabolomic and transcriptomic analysis to explore differentially accumulated metabolites (DAMs) and differentially expressed genes (DEGs) between two types of materials with distinct tassel branching numbers.ResultsWe identified a pair of maize sibling lines, unbranched tassel line (UBT) and multibranched tassel line (MBT). UBT has only one spike without branches due to the inhibition of branch meristems, while MBT has multiple branches. Gene Ontology (GO) enrichment analysis of DEGs revealed significant enrichment in organ growth regulation, hormone response and auxin signaling pathway. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of DAMs revealed enrichment in plant hormone signal transduction. Integrated transcriptomic and metabolomic analysis revealed enrichment of the tryptophan metabolism, a crucial auxin biosynthetic pathway, suggesting its potential involvement in tassel branching development.ConclusionsThe elevated levels of indole-3-acetamide in the tryptophan metabolism pathway suggest an increase in auxin accumulation, which may subsequently suppressed branch meristem formation in UBT through downregulation of BARREN STALK 1 expression and modulation of auxin signaling pathways.

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