镉低积累水稻在鄂东地区的产量表现与糙米元素吸收特征OA

In order to screen low-cadmium accumulation rice(Oryza sativa L.)varieties suitable for planting in cadmium(Cd)-con-taminated farmland in Eastern Hubei Province,10 medium-late indica rice varieties with low accumulation of Cd were used as re-search objects,and 2 local hybrid rice varieties were used as the control(CK).Field experiments were carried out in typical Cd-con-taminated paddy fields in Daye City to systematically explore the cadmium reduction potential,yield performance and uptake charac-teristics of trace elements(iron,manganese and zinc)in brown rice of the tested varieties.The results showed that the cadmium con-tent in brown rice of 10 low cadmium accumulation varieties was 0.011～0.078 mg/kg,which was significantly lower than that of the control varieties(P<0.05)and also lower than the national food safety standard limit value,showing the characteristics of low cadmi-um accumulation,and the contents of heavy metals such as arsenic,lead,chromium and mercury in brown rice all met the national food safety standard limit requirements.In terms of yield,the overall performance of the tested varieties was good,among which the yield of hybrid rice Zhenliangyou 8612 was the highest,reaching 9 947.9 kg/hm2,and the yield of conventional rice Kangdao 3 and Kangdao 6 was stable.Nutrient element analysis showed that low-cadmium accumulation varieties maintained low cadmium accumula-tion in brown rice,while the content of iron and zinc in brown rice did not decrease significantly,and the content in some varieties was even higher than that of the control varieties.Correlation analysis showed that cadmium content in brown rice was significantly pos-itively correlated with manganese content(P<0.000 1),but not significantly correlated with iron and zinc content.In summary,the 10 low-cadmium accumulation rice varieties could achieve safe production and considerable yield in the cadmium-contaminated rice area of Eastern Hubei Province,demonstrating good application prospects.