Lower Nitrogen Levels Improve Growth and Some Physiological Traits of Rice (Oryza sativa) under Salt Stress during Reproductive Period

文献类型： 外文期刊

第一作者： Liu, Xiaolong

作者： Liu, Xiaolong;Xu, Chen;Li, Qian;Wang, Hongjun;Xu, Chen;Zhang, Zhian;Lin, Fenglou;Ji, Ping;Zhu, Mo

作者机构：

关键词： Gene expression; Nitrogen level; Physiological characteristics; Rice (Oryza sativa L.); Salt stress

期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）

ISSN： 1560-8530

年卷期： 2020 年 24 卷 4 期

页码：

收录情况： SCI

摘要： Salt stress suppressed rice growth and yield formation by affecting multiple physiological and metabolic processes. Reducing nitrogen levels can be helpful to mitigate the salinity-induced decline of leaf photosynthesis and improve rice salt tolerance. This study investigated the effect of salt stress on plant growth, physiological characteristics and gene expression of rice at tittering, booting and heading stages under different nitrogen levels. Results showed that lower nitrogen levels significantly reduced salinity-induced plants wilting and accumulated more biomass at 50% applied N (0.3575 mmol/L, 50% of the normal N level). The lower nitrogen levels increased the accumulation of proline, soluble sugar and expression of transcript levels of proline biosynthesis genes (OsP5CS1 and OsP5CR), and decreased proline catabolism genes (OsPDH1 and OsP5CDH). Lower nitrogen levels mitigated salinity induced damage by reducing malondialdehyde contents, membrane injury and transcript levels of OsNAC4, a cell death-related gene and increased transcript levels of OsBIl, a cell death-suppressor gene. Lower nitrogen levels reduced ion toxicity by reducing Na+/K+ ratio, and enhancing the transcript levels of the Na+-K+ transport genes (OsHKT1 and OsAKT1) under salt stress conditions. These results suggested that lower nitrogen levels contribute to improve rice plant growth by increasing osmolytes accumulation, reduce plant damage and ion toxicity to improve salt tolerance during reproductive period. (C) 2020 Friends Science Publishers

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