Environmental and Genetic Control of Arsenic Accumulation and Speciation in Rice Grain: Comparing a Range of Common Cultivars Grown in Contaminated Sites Across Bangladesh, China, and India

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 v...

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Bibliographic Details
Published in:Environmental science & technology 2009-11, Vol.43 (21), p.8381-8386
Main Authors: 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
Format: Article
Language:English
Subjects:
Applied sciences
Arsenic
Arsenic - metabolism
Bangladesh
Biological variation
Cancer
China
Comparative analysis
Correlation analysis
Cultivars
Ecotoxicology and Human Environmental Health
Environment
Environmental Pollution
Exact sciences and technology
Genetic Variation
Genotype
Genotype & phenotype
India
Oryza - genetics
Oryza - growth & development
Oryza - metabolism
Oryza sativa
Pollution
Rice
Seeds - genetics
Seeds - metabolism
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Summary: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.
ISSN:0013-936X
1520-5851
DOI:10.1021/es901844q