Lan Xiuquan, Li Jiayuan, Chen Jiancheng, Liu Jing, Cao Feishu, Liao Changjun, Zhang Zengyu, Gu Minghua, Wei Yanyan, Shen Fangke, Wei Xianghua, Luo Xianbao, Zhang Xiuling
Cultivation Base of Guangxi Key Laboratory for Agro-Environment and Agro-Products Safety, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, Guangxi University, Nanning, China.
College of Environment and Energy, South China University of Technology, Guangzhou, China.
Int J Phytoremediation. 2023;25(2):161-171. doi: 10.1080/15226514.2022.2066064. Epub 2022 May 15.
Arsenic and cadmium pose a potential health risk to human beings via rice grain consumption. In the current study, a pot experiment was conducted to evaluate the effect of Br (5 mM and 20 mM) and Se (1 mM) at rice tillering and filling stages on Cd and As accumulation in rice grain and their health risk indices. The results showed that Br or Se applications at different stages of rice improved the photosynthesis, reduce MDA content in flag leaves by 17.41%-38.65%, increased rice biomass and grain yield by 10.50%-29.94% and 10.50%-36.56%, and enhanced grain N and P uptake by 3.25%-34.90%, and 22.98%-72.05%, respectively. Applications of Br and Se effectively decreased Cd and As concentration in rice grain by 31.74%-86.97% and 16.42%-81.13% respectively. Compared to the individual treatment, combined 20 mM Br and 1 mM Se at the filling stage showed the lowest accumulation of As (0.149 mg·kg) and Cd (0.105 mg·kg) in grain, and its health risk index was below the acceptable limits (HRI < 1). This implies that application of Br and Se at the filling stage is a promising strategy for the safe production of rice in As and Cd co-contaminated regions.
通过食用大米，砷和镉对人类健康构成潜在风险。在本研究中，进行了盆栽试验，以评估在水稻分蘖期和灌浆期施用溴（5 mM和20 mM）和硒（1 mM）对水稻籽粒中镉和砷积累及其健康风险指数的影响。结果表明，在水稻不同生育阶段施用溴或硒可改善光合作用，使剑叶中丙二醛含量降低17.41%-38.65%，水稻生物量和籽粒产量分别提高10.50%-29.94%和10.50%-36.56%，籽粒氮和磷吸收量分别提高3.25%-34.90%和22.98%-72.05%。施用溴和硒分别有效降低了水稻籽粒中镉和砷的浓度，降幅分别为31.74%-86.97%和16.42%-81.13%。与单独处理相比，在灌浆期同时施用20 mM溴和1 mM硒时，籽粒中砷（0.149 mg·kg）和镉（0.105 mg·kg）的积累量最低，其健康风险指数低于可接受限值（HRI<1）。这表明在灌浆期施用溴和硒是砷镉共污染地区水稻安全生产的一种有前景的策略。
