Characterization of arsenic metabolites in rice plant treated with DSMA (disodium methanearsonate)

Odanaka, Yoshitsugu; Tsuchiya, Noriko.; Matano, Osami; Goto, Shinko

doi:10.1021/jf00064a050

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…Thus, DMA in brown rice would be derived from the methylated product of MMA. Odanaka et al 19 reported that DMA was increased in the nutrient solution of rice seedlings grown in MMA-containing solution and transported to MMA-free solution. MMA was added to nutrient solution that was previously prepared by dipping rice seedlings and incubating.…”

Section: ' Discussionmentioning

confidence: 99%

Effects of Arsenic Compound Amendment on Arsenic Speciation in Rice Grain

Arao

Kawasaki

Baba

et al. 2011

Environ. Sci. Technol.

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Rice consumption is a major source of arsenic for Asian populations. Arsenic is present in rice grain both as inorganic arsenic and as dimethylarsinic acid (DMA). It is unclear whether DMA in rice is taken up from the soil or synthesized in planta. We investigated the effect of DMA, methylarsonic acid (MMA) and arsenite amendment on arsenic speciation in rice grain grown in soil and in solution culture. We also investigated the methylation of arsenic in solution culture under suppression of bacterial activity. When rice was grown under flooded conditions after the heading stage, DMA amendment to the soil resulted in higher DMA concentration in brown rice and rice straw. In the solution culture, not only DMA amendment but also MMA or arsenite amendment increased the DMA concentration in brown rice and rice straw. DMA was detected in the solution amended by MMA or arsenite with young rice plants. When the solution included the antibacterial agent chloramphenicol, DMA concentration in the solution decreased dramatically. When only the soil was incubated with MMA or arsenite, only a slight amount of DMA was detected in the soil. These results suggest that rice rhizosphere associated bacteria would be involved in the formation of DMA in brown rice.

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Section: ' Discussionmentioning

confidence: 99%

Effects of Arsenic Compound Amendment on Arsenic Speciation in Rice Grain

Arao

Kawasaki

Baba

et al. 2011

Environ. Sci. Technol.

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“…Plant-mediated methylation of arsenic has also been investigated in rice. Plants were exposed to MMA amended nutrient solution for 7 d, after which time the majority of arsenic in the plant tissues was present as monomethyl-arsenic compounds, that is, no methylation or demethylation appeared to have taken place (Odanaka et al, 1985). However, when the nutrient solution was analysed, dimethyl-and trimethyl-arsenic compounds were present and comprised 18% of the total arsenic budget.…”

Section: Arsenic Metabolismmentioning

confidence: 99%

Arsenic uptake and metabolism in arsenic resistant and nonresistant plant species

2002

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SummaryElevation of arsenic levels in soils causes considerable concern with respect to plant uptake and subsequent entry into wildlife and human food chains. Arsenic speciation in the environment is complex, existing in both inorganic and organic forms, with interconversion between species regulated by biotic and abiotic processes. To understand and manage the risks posed by soil arsenic it is essential to know how arsenic is taken up by the roots and metabolized within plants. Some plant species exhibit phenotypic variation in response to arsenic species, which helps us to understand the toxicity of arsenic and the way in which plants have evolved arsenic resistances. This knowledge, for example, could be used produce plant cultivars that are more arsenic resistant or that have reduced arsenic uptake. This review synthesizes current knowledge on arsenic uptake, metabolism and toxicity for arsenic resistant and nonresistant plants, including the recently discovered phenomenon of arsenic hyperaccumulation in certain fern species. The reasons why plants accumulate and metabolize arsenic are considered in an evolutionary context. © New Phytologist (2002) 154 : 29 -43

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“…Rice was exposed to an MMAA-amended nutrient solution for seven days, following which the majority of the arsenic in the plant tissues was present in the form of monomethylarsenic compounds; i.e., no methylation or demethylation of MMAA appeared to have occurred (14). MPAA was detected in small amounts in the straw of the rice grown in the PAAadded solution culture (Table 1), so the data suggested the occurrence of the methylation of the AAs in the rice plant (Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Uptake of Aromatic Arsenicals from Soil Contaminated with Diphenylarsinic Acid by Rice

Arao

Maejima

Baba

2009

Environ. Sci. Technol.

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Chemical warfare agents containing aromatic arsenicals (AAs) such as Clark I (diphenylchloroarsine) are well-known, as is the risk of leakage from such munitions into the environment. We investigated the uptake of AAs in agricultural soils by rice. Methylphenylarsinic acid (MPAA) was detected in brown rice grown in contaminated soil. Dimethylphenylarsine oxide (DMPAO) and methyldiphenylarsine oxide (MDPAO) were detected in the straw but not in the grains grown in the contaminated soil. Inthe contaminated soil, phenylarsonic acid (PAA) and MPAA concentrations decreased and DMPAO concentration increased under the flooded conditions; however, their concentrations remained unchanged underthe upland conditions. DMPAO was detected in the straw of the rice grown in PAA- or MPAA-amended soil but was not detected in that grown in a PAA- or MPAA-added solution culture. MDPAO was detected in the straw of the rice grown in diphenylarsinic acid (DPAA)-amended soil but was not detected in that grown in a DPAA-added solution culture. Thus, MPAA and DPAA were methylated not in the rice plant but in the soil under the flooded conditions. Dephenylated products were detected in the straw grown in AA-added solution cultures, but demethylated products were not detected. DMPAO and MDPAO absorbed by the shoots were retained, and MPAA and DPAA absorbed by the shoots were translocated to the grains more easily than other AAs.

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Characterization of arsenic metabolites in rice plant treated with DSMA (disodium methanearsonate)

Cited by 15 publications

References 7 publications

Effects of Arsenic Compound Amendment on Arsenic Speciation in Rice Grain

Effects of Arsenic Compound Amendment on Arsenic Speciation in Rice Grain

Arsenic uptake and metabolism in arsenic resistant and nonresistant plant species

Uptake of Aromatic Arsenicals from Soil Contaminated with Diphenylarsinic Acid by Rice

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