A maize WAK-SnRK1α2-WRKY module regulates nutrient availability to defend against head smut disease

文献类型： 外文期刊

第一作者： Zhang, Qianqian

作者： Zhang, Qianqian;Xu, Qianya;Zhang, Nan;Zhong, Tao;Fan, Zhou;Yan, Mingzhu;Xu, Mingliang;Zhang, Nan;Xing, Yuexian

作者机构：

关键词： head smut disease; Sporisorium reilianum; ZmWAK; SnRK1a2; phosphorylation; nutrient

期刊名称：MOLECULAR PLANT （ 影响因子：24.1； 五年影响因子：25.8 ）

ISSN： 1674-2052

年卷期： 2024 年 17 卷 11 期

页码：

收录情况： SCI

摘要： Obligate biotrophs depend on living hosts for nutrient acquisition to complete their life cycle, yet the mechanisms by which hosts restrict nutrient availability to pathogens remain largely unknown. The fungal pathogen Sporisorium reilianum infects maize seedlings and causes head smut disease in inflorescences at maturity, while a cell wall-associated kinase, ZmWAK, provides quantitative resistance against it. In this study, we demonstrate that S. reilianum can rapidly activate ZmWAK kinase activity, which is sustained by the 407th threonine residue in the juxtamembrane domain, enabling it to interact with and phosphorylate ZmSnRK1a2, a conserved sucrose non-fermenting-related kinase a subunit. The activated ZmSnRK1a2 translocates from the cytoplasm to the nucleus, where it phosphorylates and destabilizes the transcription factor ZmWRKY53. The reduced ZmWRKY53 abundance leads to the downregulation of genes involved in transmembrane transport and carbohydrate metabolism, resulting in nutrient starvation for S. reilianum in the apoplast. Collectively, our study uncovers a WAK-SnRK1a2-WRKY53 signaling module in maize that conveys phosphorylation cascades from the plasma membrane to the nucleus to confer plant resistance against head smut in maize, offering new insights and potential targets for crop disease management.

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