title: Variations and constancy of mercury and methylmercury accumulation in rice grown at contaminated paddy field sites in three Provinces of China.
abstract: Many paddy fields have been contaminated by mercury (Hg) in mining areas of China. In this study, twenty-six rice cultivars and three Hg contaminated paddy fields in different geographic regions were selected for field trials and aimed to investigate the variations and similarities in total Hg (THg) and methylmercury (MeHg) accumulations in brown rice (seeds) across sites. Our results revealed widescale cultivar variation in THg (13-52 ng g(-1) at Wanshan) and MeHg (3.5-23 ng g(-1)) accumulation and %MeHg (17.7-89%) in seeds. The ability to translocate is an important factor in the levels of THg and MeHg in seed. Cultivar tended to stability in THg accumulation across sites. Some cultivars accumulated lower concentrations of both THg and MeHg in seeds at fields seriously contaminated by Hg. Present results suggest that appropriate cultivar selection is a possible way to reduce THg and MeHg accumulation in seeds of rice grown in Hg-contaminated regions.
authors.affiliation: State Key Laboratory for Bio-control and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China.
authors.forename: B
authors.initials: B
authors.lastname: Li
authors.forename: J B
authors.initials: JB
authors.lastname: Shi
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Meng
authors.forename: L
authors.initials: L
authors.lastname: Huang
authors.forename: X L
authors.initials: XL
authors.lastname: Qi
authors.forename: B
authors.initials: B
authors.lastname: He
authors.forename: Z H
authors.initials: ZH
authors.lastname: Ye
mesh_terms: D000383:Agriculture; D002681:China; D004784:Environmental Monitoring; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis*; D008906:Mining; D012275:Oryza / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D008767:Methylmercury Compounds; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Mercury; Methylmercury; Mining area; Paddy field; Rice