ZmXYL modulates auxin-induced maize growth

文献类型： 外文期刊

第一作者： Li, Haiyan

作者： Li, Haiyan;Tao, Huifang;Xiao, Yao;Cheng, Beijiu;Lu, Xiaoduo;Qin, Li;Lu, Xiaoduo;Lan, Chen;Zhang, Xuebin;Roberts, Jeremy A.;Lu, Xiaoduo

作者机构：

关键词： Zea mays; EMS-induced mutants; dwarf; alpha-xylosidase; XXXG

期刊名称：PLANT JOURNAL （ 影响因子：7.2； 五年影响因子：7.9 ）

ISSN： 0960-7412

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Plant architecture, lodging resistance, and yield are closely associated with height. In this paper, we report the identification and characterization of two allelic EMS-induced mutants of Zea mays, xyl-1, and xyl-2 that display dwarf phenotypes. The mutated gene, ZmXYL, encodes an alpha-xylosidase which functions in releasing xylosyl residue from a beta-1,4-linked glucan chain. Total alpha-xylosidase activity in the two alleles is significantly decreased compared to wild-type plants. Loss-of-function mutants of ZmXYL resulted in a decreased xylose content, an increased XXXG content in xyloglucan (XyG), and a reduced auxin content. We show that auxin has an antagonistic effect with XXXG in promoting cell divisions within mesocotyl tissue. xyl-1 and xyl-2 were less sensitive to IAA compared to B73. Based on our study, a model is proposed that places XXXG, an oligosaccharide derived from XyG and the substrate of ZmXYL, as having a negative impact on auxin homeostasis resulting in the dwarf phenotypes of the xyl mutants. Our results provide a insight into the roles of oligosaccharides released from plant cell walls as signals in mediating plant growth and development.

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