数字农科院2.0

Appropriate Supply of Ammonium Nitrogen and Ammonium Nitrate Reduces Cadmium Content in Rice Seedlings by Inhibiting Cadmium Uptake and Transport

文献类型： 外文期刊

作者： Hu Yunchao;Yan Tiancai;Gao Zhenyu;Wang Tiankang;Lu Xueli;Yang Long;Shen Lan;Zhang Qiang;Hu Jiang;Ren Deyong;Zhang Guangheng;Zhu Li;Li Li;Zeng Dali;Qian Qian;Li Qing

作者机构：

关键词： ammonium chloride;ammonium nitrate;cadmium;nitrogen;Oryza sativa

期刊名称： Rice Science

ISSN： 1672-6308

年卷期： 2024 年 31 卷 5 期

页码：

收录情况： SCIE（2024版） ; ; CSCD（2023-2024年度） ; ; 科技核心（2024版） ; ; 农林核心（2020版）

摘要： Reasonable nitrogen (N) application is a promising strategy for reducing crop cadmium (Cd) toxicity. However, the specific form of N and the required amount that affect Cd tolerance and accumulation in rice remain unclear. This study explored the influence of different N-fertilizer forms (NH4NO3, NH4Cl, and KNO3) and dosages on Cd tolerance and uptake in Cd-stressed N-sensitive and N-insensitive indica rice accessions. The results indicated that the Cd tolerance of N-sensitive indica accessions is more robust than that of N-insensitive ones. Furthermore, the shoot Cd content and Cd translocation rate in both N-sensitive and N-insensitive indica accessions decreased with an appropriate supply of NH4NO3 and NH4Cl, whereas they were comparable or slightly increased with increased KNO3. Unfortunately, we did not find significant and regular differences in Cd accumulation or translocation between N-sensitive and N-insensitive rice accessions. Consistent with the reduction of shoot Cd content, the addition of NH4NO3 and NH4Cl also inhibited the instantaneous root Cd2+ uptake. The expression changes of Cd transport-related genes under different N forms and dosages suggested that the decreased shoot Cd content, caused by the increased supply of NH4NO3 and NH4Cl, is likely achieved by reducing the transcription of OsNRAMP1 and OsIRT1. In summary, our findings reveal that an appropriate supply of NH4NO3 and NH4Cl could reduce Cd uptake and transport in rice seedlings, suggesting that rational N management could reduce the Cd risk in rice production.

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