β-Glucan content increase in Waxy-mutated barley is closely associated with positive stress responses and is regulated by ASR1

文献类型： 外文期刊

第一作者： Li, Qiao

作者： Li, Qiao;Pan, Zhifen;Zhang, Zhihui;Tang, Hongmei;Cai, Jingchi;Zhang, Zhihui;Cai, Jingchi;Zeng, Xingquan;Li, Zhongyi

作者机构：

关键词： beta-Glucan; Barley; Waxy; Stress; ASR1; CslF6

期刊名称：CARBOHYDRATE POLYMERS （ 影响因子：12.5； 五年影响因子：11.9 ）

ISSN： 0144-8617

年卷期： 2025 年 347 卷

页码：

收录情况： SCI

摘要： Mixed-linkage (1,3; 1,4)-beta-D-glucan (MLG) impacts the food and industrial end-uses of barley, but the molecular mechanism of variations in MLG content remains unclear. MLG content usually increases in Waxy-mutated barley. This study applied transcriptomic, proteomic, and metabolomic analyses to Waxy-mutated recombinant inbred lines with higher MLG content and wild-type lines with lower MLG content, and identified candidate genes and pathways regulating MLG content through combining preliminary gene function analysis. MLG biosynthesis differed significantly during late grain development in the Waxy-mutated and wild-type barley lines. The MLG increase was closely associated with strongly active sugar and starch metabolism and stress-responsive plant hormones, particularly abscisic acid (ABA) signaling process. Stress-responsive transcript factors ILR3, BTF3, RGGA, and PR13 protein bind to CslF6, which is critical for barley MLG biosynthesis, and the stressresponsive gene ASR1 also had a positive effect on MLG increase. Waxy mutation enhances barley stress responses by activating ABA- or other stress-responsive plant hormones signaling processes, which facilitates MLG biosynthesis. This study provides a new approach for elucidating the variations in MLG content of barley grains.

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