Chitosan Oligosaccharides Mitigate Flooding Stress Damage in Rice by Affecting Antioxidants, Osmoregulation, and Hormones

文献类型： 外文期刊

第一作者： Lu, Haoyu

作者： Lu, Haoyu;Wang, Mei;Chen, Ke;Wang, Lifeng;Bai, Lianyang;Zhang, Yuzhu;Lu, Haoyu;Wang, Mei;Yi, Zhenxie;Zhou, Shangfeng;Bai, Lianyang

作者机构：

关键词： rice; flooding stress; chitosan oligosaccharide; antioxidant system; hormones

期刊名称：ANTIOXIDANTS （ 影响因子：7.0； 五年影响因子：7.3 ）

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年卷期： 2024 年 13 卷 5 期

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收录情况： SCI

摘要： Rice (Oryza sativa L.) is one of the most important food crops worldwide. However, during direct seeding, rice is extremely vulnerable to flooding stress, which impairs rice's emergence and seedling growth and results in a significant yield loss. According to our research, chitosan oligosaccharides have the potential to be a chemical seed-soaking agent that greatly increases rice's resistance to flooding. Chitosan oligosaccharides were able to enhance seed energy supply, osmoregulation, and antioxidant capacity, according to physiological index assessments. Using transcriptome and metabolomic analysis, we discovered that important differential metabolites and genes were involved in the signaling pathway for hormone synthesis and antioxidant capacity. Exogenous chitosan oligosaccharides specifically and significantly inhibit genes linked to auxin, jasmonic acid, and abscisic acid. This suggested that applying chitosan oligosaccharides could stabilize seedling growth and development by controlling associated hormones and reducing flooding stress by enhancing membrane stability and antioxidant capacity. Finally, we verified the effectiveness of exogenous chitosan oligosaccharides imbibed in seeds by field validation, demonstrating that they can enhance rice seedling emergence and growth under flooding stress.

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