Reducing total mercury and methylmercury accumulation in rice grains through water management and deliberate selection of rice cultivars

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)202-208
Journal / PublicationEnvironmental Pollution
Volume162
Online published11 Dec 2011
Publication statusPublished - Mar 2012
Externally publishedYes

Abstract

Rice consumption has been identified as a major route of methylmercury (MeHg) exposure in some areas of inland China. We investigated two potential mitigation methods (water management and deliberate selection of rice cultivars) to reduce the amount of total mercury (Hg) and MeHg within the grain. Rice grown aerobically had markedly reduced total Hg and MeHg concentrations as well as a much lower proportion of MeHg in the grain. Remarkably, there were considerable variations in the total Hg and MeHg concentrations as well as the proportion of MeHg in the grain among the 24 cultivars grown in the same paddy soil. The Hg tolerance index (expressed as % mean of control root growth) also varied substantially among the different cultivars. Furthermore, negative correlations were found between the total Hg and MeHg concentrations (P < 0.05) of grain and the proportion of MeHg in the grain (P < 0.01). © 2011 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Genetic variation, Mercury, Methylmercury, Oryza sativa L., Soil redox potential

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