Variation in grain arsenic assessed in a diverse panel of rice (Oryza sativa) grown in multiple sites

Gareth J. Norton*, Shannon R.M. Pinson, Jill Alexander, Susan McKay, Helle Hansen, Gui Lan Duan, M. Rafiqul Islam, Shofiqul Islam, Jacqueline L. Stroud, Fang Jie Zhao, Steve P. McGrath, Yong Guan Zhu, Brett Lahner, Elena Yakubova, Mary Lou Guerinot, Lee Tarpley, Georgia C. Eizenga, David E. Salt, Andrew A. Meharg, Adam H. Price

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)

Abstract

• Inorganic arsenic (As i) in rice (Oryza sativa) grains is a possible threat to human health, with risk being strongly linked to total dietary rice consumption and consumed rice As i content. This study aimed to identify the range and stability of genetic variation in grain arsenic (As) in rice. • Six field trials were conducted (one each in Bangladesh and China, two in Arkansas, USA over 2yr, and two in Texas, USA comparing flooded and nonflood treatments) on a large number of common rice cultivars (c. 300) representing genetic diversity among international rice cultivars. • Within each field there was a 3-34 fold range in grain As concentration which varied between rice subpopulations. Importantly, As i correlated strongly with total As among a subset of 40 cultivars harvested in Bangladesh and China. • Genetic variation at all field sites was a large determining factor for grain As concentration, indicating that cultivars low in grain As could be developed through breeding. The temperate japonicas exhibited lower grain As compared with other subpopulations. Effects for year, location and flooding management were also statistically significant, suggesting that breeding strategies must take into account environmental factors.

Original languageEnglish
Pages (from-to)650-664
Number of pages15
JournalNew Phytologist
Volume193
Issue number3
DOIs
Publication statusPrint publication - Feb 2012
Externally publishedYes

Keywords

  • Arsenic
  • Breeding
  • Cultivar variation
  • Inorganic arsenic
  • Rice

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