The variety screening of cadmium-low and selenium-rich rice
The variety screening of cadmium(Cd)-low and selenium(Se)-rich rice is an importantl work for safe utilization of Cd contaminated soil and effective development of soil Se resource.Field trials were carried out with 19 rice varieties to screen Cd-low and Se-rich rice varieties,and stability were verified using rice Cd content,Se content and rice yield as assessment indicators.Results showed that the mass concentrations of rice Cd and Se were 0.017-0.547 and 0.014-0.469 mg/kg,respectively.The cluster analysis indicated that Zhongzheyou H7,Yongyou 15,Jiaheyou 1,Taifengyou 2,Zhongzheyou 8 and Jiafengyou 911 belonged to Cd-low and Se-rich varieties.Among them,Jiaheyou 1,Taifengyou 2,Zhongzheyou 8 and Jiafengyou 911 complied with the Cd limitation standard(0.20 mg/kg)of"National food safety standards:pollutants limitation in food"(GB 2762-2017)and the Se-rich standard(0.04-0.30 mg/kg)of"Rich selenium paddy"(GB/T 22499-2008).However,Jiaheyou 1's rice yield was lower than average level of rice yield in Zhejiang(7 500 kg/hm2).After stability verified in the second year,Taifengyou 2,Zhongzheyou 8 and Jiafengyou 911 showed stable Cd-low and Se-rich ability with high yield.Therefore,Taifengyou 2,Zhongzheyou 8 and Jiafengyou 911 were recommended as the priority rice varieties for promotion cultivation in the west of Zhejiang by considering rice Cd content,Se content and rice yield,as well as stability.
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