Norton Gareth J, Duan Guilan, Dasgupta Tapash, Islam M Rafiqul, Lei Ming, Zhu Yongguan, Deacon Claire M, Moran Annette C, Islam Shofiqul, Zhao Fang-Jie, Stroud Jacqueline L, McGrath Steve P, Feldmann Joerg, Price Adam H, Meharg Andrew A
Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, AB24 3UU, U.K.
Environ Sci Technol. 2009 Nov 1;43(21):8381-6. doi: 10.1021/es901844q.
The concentration of arsenic (As) in rice grains has been identified as a risk to human health. The high proportion of inorganic species of As (As(i)) is of particular concern as it is a nonthreshold, class 1 human carcinogen. To be able to breed rice with low grain As, an understanding of genetic variation and the effect of different environments on genetic variation is needed. In this study, 13 cultivars grown at two field sites each in Bangladesh, India, and China are evaluated for grain As. There was a significant site, genotype, and site by genotype interaction for total grain As. Correlations were observed only between sites in Bangladesh and India, not between countries or within the Chinese sites. For seven cultivars the As was speciated which revealed significant effects of site, genotype, and site by genotype interaction for percentage As(i). Breeding low grain As cultivars that will have consistently low grain As and low As(i), over multiple environments using traditional breeding approaches may be difficult, although CT9993-5-10-1-M, Lemont, Azucena, and Te-qing in general had low grain As across the field sites.
水稻籽粒中的砷（As）浓度已被确认为对人类健康的一种风险。砷的无机形态（As(i)）占比高尤其令人担忧，因为它是一种无阈值的1类人类致癌物。为了能够培育出籽粒砷含量低的水稻，需要了解遗传变异以及不同环境对遗传变异的影响。在本研究中，对分别种植于孟加拉国、印度和中国各两个田间地点的13个品种的水稻籽粒砷含量进行了评估。对于总籽粒砷含量，存在显著的地点、基因型以及地点与基因型的交互作用。仅在孟加拉国和印度的地点之间观察到相关性，不同国家之间以及中国各地点内部均未观察到相关性。对7个品种的砷进行了形态分析，结果显示对于As(i)的百分比，存在显著的地点、基因型以及地点与基因型的交互作用。利用传统育种方法培育在多种环境下籽粒砷含量始终较低且As(i)含量也低的品种可能具有难度，不过CT9993 - 5 - 10 - 1 - M、Lemont、Azucena和特青总体上在各个田间地点的籽粒砷含量都较低。
