川东南地区不同水稻品种镉转运积累特征研究OA

The characteristics of cadmium(Cd)translocation and accumulation in different rice cultivars in the southeast Sichuan were investigated to provide theoretical references for the safe production of rice in regional mild Cd-contaminated paddy fields.Eight local staple rice cultivars in Longchang City,Sichuan Province,were selected as experimental materials to determine the agronomic traits and Cd content of each part of ricethrough field plot test methods,the Cd accumulation and translocation characteristics of each cultivar of rice were analyzed,to filter out the suitable rice cultivars with low Cd accumulation.The results showed that the agronomic traits of the eight rice cultivars differed significantly,and all of them were within the theoretical yield range of the corresponding cultivars.The accumulation capacity of Cd in different parts of rice was ranked as grain>leaf>straw>root,with the exception of'Neixiangyou 3','Neixiangyou 5'and'Taiyou 2903'.Only'Taiyou 2903'was below the standard limit of Cd content(0.20 mg/kg)in grains,which complied with the requirement set in the National Food Standards(GB 2762-2022)among the eight cultivars,and the BCF grains and TF grains/leaves of this cultivar were lower than those of other rice cultivars.The transfer factor pattern was TF leaf/straw>TF grain/leaf>TF straw/root,except for'Neixiangyou 5'and'Neixiangyou 8'.Correlation analysis suggested a highly significant positive correlation between Cd content in rice grain and straw(P<0.01),and the Cd content in rice grain was positively correlated with TF straw/root and TF grain/leaf(P<0.05),respectively.Therefore,it was recommended to popularize the cultivation of'Taiyou 2903'in mild Cd-contaminated areas,and the yield can be improved by rational matching of fertilizers and other measures.