通过盆栽试验,比较了29种不同基因型旱稻对As、Cd的吸收与转运。研究结果表明:不同基因型旱稻在生物量和As、Cd吸收上均表现出显著差异,单株平均生物量和变异系数分别为23.57 g和15.8%。茎叶、颖壳和糙米As含量分别为1.022、0.177、0.050 mg·kg~(-1),变异系数分别为25.1%、54.3%和39.7%;Cd含量分别为0.811、0.230、0.116 mg·kg~(-1),变异系数分别为58.2%、38.9%和58.0%。旱稻不同器官对As、Cd累积的大小顺序均为糙米<颖壳<茎叶,Cd、As在三器官间的比值分别为1∶1.9∶6.7和1∶3.5∶20.4,说明不同器官间Cd转移系数高于As。相关性分析表明,茎叶与颖壳、茎叶与糙米、颖壳与糙米之间的相关系数:Cd分别为0.466(P<0.05)、0.658(P<0.01)和0.758(P<0.01),As分别为0.437(P<0.05)、0.290和0.611(P<0.01)。旱稻对Cd的吸收与转运能力以及其基因型差异均较As大。29份不同基因型旱稻糙米As含量均达标(NY 5115—2002,0.5 mg·kg~(-1)),82.8%的旱稻Cd达标(GB 2762—2012,0.2 mg·kg~(-1)),糙米As、Cd含量均低于二分之一标准的基因型占37.9%,包括V2、V3、V6、V11、V12、V13、V15、V16、V19、V20和V25,表明通过筛选Cd、As低吸收的旱稻进行非淹水种植可保障稻米安全生产。 Through pot experiment, the uptake and transport of As and Cd by upland rice from 29 different genotypes were compared. The results showed that the uptake rate of As, Cd in different genotypes of Upland rice showed significant differences. The average biomass and coefficient of variation of single Upland was 23.57 g and 15.8%, respectively. The As content of stem, leaf, glume and brown rice were 1.022,0.177,0.050 mg · kg -1, the coefficient of variation were 25.1%, 54.3% and 39.7% respectively. The contents of Cd were 0.811,0.230,0.116 mg · kg -1 ~ (-1), the coefficient of variation was 58.2%, 38.9% and 58.0% respectively. The order of accumulation of As and Cd in different organs of upland rice was brown rice