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ZmDRR206 functions in maintaining cell wall integrity during maize seedling growth and defense response to external stresses

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The Crop Journal 2023年第6期11卷 1649-1664页

作者： Tao Zhong Suining Deng Mang Zhu Xingming Fan Mingliang Xu Jianrong Ye National Maize Improvement Center/Center for Crop Functional Genomics and Molecular Breeding China Agricultural UniversityBeijing 100193China Institute Food Crops Yunnan Academy of Agricultural SciencesKunming 650205YunnanChina

Plants adaptively change their cell wall composition and structure during their growth,development,and interactions with environmental *** proteins(DIRs)contribute to environmental adaptations by dynamically reorganizing the cell wall and/or by generating defense compounds.A maize DIR,ZmDRR206,was previously reported to play a dominant role in regulation of storage nutrient accumulation in endosperm during maize kernel *** we show that ZmDRR206 mediates maize seedling growth and disease resistance by coordinately regulating biosynthesis of cell wall components for cell-wall integrity(CWI)*** of ZmDRR206 was induced in maize seedlings upon pathogen ***206 overexpression in maize resulted in reduced seedling growth and photosynthetic activity but increased disease resistance and drought tolerance,revealing a tradeoff between growth and ***,ZmDRR206 overexpression reduced the contents of primary metabolites and down-regulated genes involved in photosynthesis,while increasing the contents of major cell wall components,defense phytohormones,and defense metabolites,and up-regulated genes involved in defense and cell-wall biosynthesis in ***206-overexpressing seedlings were resistant to cell-wall stress imposed by isoxaben,and ZmDRR206 physically interacted with ZmCesA10,which is a cellulose synthase *** findings suggest a mechanism by which ZmDRR206 coordinately regulates biosynthesis of cell-wall components for CWI maintenance during maize seedling growth,and might be exploited for breeding strong disease resistance in maize.

关键词： cell-wall integrity cell-wall biosynthesis Dirigent protein ZmDRR206 Defense response Seedling growth

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