title: Water management, rice varieties and mycorrhizal inoculation influence arsenic concentration and speciation in rice grains.
abstract: A pot experiment was carried out to investigate the effects of water management and mycorrhizal inoculation on arsenic (As) uptake by two rice varieties, the As-resistant BRRI dhan 47 (B47) and As-sensitive BRRI dhan 29 (B29). Grain As concentration of B47 plants was significantly lower than that of B29, and grain As concentration of B47 was higher under flooding conditions than that under aerobic conditions. In general, mycorrhizal inoculation (Rhizophagus irregularis) had no significant effect on grain As concentrations, but decreased the proportion of inorganic arsenic (iAs) in grains of B47. The proportion of dimethylarsinic acid (DMA) in the total grain As was dramatically higher under flooding conditions. Results demonstrate that rice variety selection and appropriate water management along with mycorrhizal inoculation could be practical countermeasures to As accumulation and toxicity in rice grains, thus reducing health risks of As exposure in rice diets.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
authors.forename: Songlin
authors.initials: S
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
authors.forename: Baihui
authors.initials: B
authors.lastname: Ren
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China. bdchen@rcees.ac.cn.
authors.forename: Baodong
authors.initials: B
authors.lastname: Chen
mesh_terms: D057914:Agricultural Irrigation; D001151:Arsenic / Q000032:analysis* / Q000378:metabolism; D055137:Glomeromycota / Q000254:growth & development* / Q000378:metabolism; D038821:Mycorrhizae / Q000254:growth & development* / Q000378:metabolism; D012275:Oryza / Q000737:chemistry* / Q000145:classification / Q000378:metabolism / Q000382:microbiology*; D012639:Seeds / Q000737:chemistry / Q000145:classification / Q000378:metabolism; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D014867:Water / Q000032:analysis* / Q000378:metabolism
chemical_list: D012989:Soil Pollutants; D014867:Water; D001151:Arsenic
keywords: Anaerobic/aerobic cultivation; Arbuscular mycorrhizal fungi; Arsenic; Metal tolerance; Rice