数字农科院2.0

Phosphorus application interferes expression of Fe uptake-associated genes to feedback regulate Cd accumulation in rice (Oryza sativa L.) and relieves Cd toxicity via antioxidant defense

文献类型： 外文期刊

作者： Huang, Qina;An, Hua;Chen, Jiangmin;Li, Xiaolin;Shao, Guosheng

作者机构：

关键词： Cadmium;Phosphorus;Antioxidant defense system;Iron uptake;transport system;Gene expression

期刊名称： PLANT GROWTH REGULATION

ISSN： 0167-6903

年卷期： 2023 年

页码：

收录情况： SCIE（2023版）

摘要： Exogenous phosphorus (P) application can affect the degree of cadmium (Cd) accumulation in plants. In this study, a high-Cd accumulating rice cultivar (Fupin 36) was used to investigate the relationship between P and Cd. Pot experiments (hydroponics and soil culture) showed that Cd exposure inhibited plant biomass increased and interfered the uptake of nutrient elements. However, application of appropriate levels of P mitigated the deleterious effects of Cd and decreased Cd accumulation in rice, whereas application of a high level of P exacerbated Cd toxicity, indicating that P induced Cd accumulation in a dose-dependent manner. Kinetics analysis showed that Cd uptake in the roots was positively correlated with the P absorption pathway. Appropriate P application partially mitigated the lipid peroxidation impact and increased antioxidant enzymes activity (superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase) to ameliorate Cd-associated toxicity. Importantly, P application to upregulated the expression of Fe-responsive genes (e.g., OsNRAMP1, OsIRT1, OsYSL15, OsIRO2, and OsNAS2), and further positive feedback regulated the Cd accumulation by OsNRAMP1 and OsIRT1 as the Cd2+/Fe2+ transporters. These findings indicated that P regulated Cd (im)mobilization by mediating the Fe homeostasis pathway in plants. In conclusion, P affected the Fe content by interfering Fe uptake-associated pathway (especially of OsNRAMP1 and OsIRT1) and feedback regulate the Cd accumulation in rice, as well as modulated the antioxidant defense to relieve the Cd toxicity. Additionally, appropriate levels of P application can enhance the Cd detoxification process and plant growth and ensure grain production and security.

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