Effect of silicon spraying on rice photosynthesis and antioxidant defense system on cadmium accumulation

文献类型： 外文期刊

第一作者： Chen, Hongxing

作者： Chen, Hongxing;Huang, Xiaoyun;Chen, Hui;Zhang, Song;He, Tengbing;Gao, Zhenran;Chen, Hongxing;Huang, Xiaoyun;Chen, Hui;Zhang, Song;Fu, Tianling;He, Tengbing;Gao, Zhenran;Fan, Chengwu;Fu, Tianling

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关键词： Rice; Cd; Si; Photosynthesis; Antioxidant defense system

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2024 年 14 卷 1 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) pollution is a serious threat to food safety and human health. Minimizing Cd uptake and enhancing Cd tolerance in plants are vital to improve crop yield and reduce hazardous effects to humans. In this study, we designed three Cd concentration stress treatments (Cd1: 0.20 mgkg-1, Cd2: 0.60 mgkg-1, and Cd3: 1.60 mgkg-1) and two foliar silicon (Si) treatments (CK: no spraying of any material, and Si: foliar Si spraying) to conduct pot experiments on soil Cd stress. The results showed that spraying Si on the leaves reduced the Cd content in brown rice by 4.79-42.14%. Si application increased net photosynthetic rate (Pn) by 1.77-4.08%, stomatal conductance (Gs) by 5.27-23.43%, transpiration rate (Tr) by 2.99-20.50% and intercellular carbon dioxide (CO2) concentration (Ci) by 6.55-8.84%. Foliar spraying of Si significantly increased the activities of superoxide dismutase (SOD) and peroxidase (POD) in rice leaves by 9.84-14.09% and 4.69-53.09%, respectively, and reduced the content of malondialdehyde (MDA) by 7.83-48.72%. In summary, foliar Si spraying protects the photosynthesis and antioxidant system of rice canopy leaves, and is an effective method to reduce the Cd content in brown rice.

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