Inhibition of Microbial Methylation via arsM in the Rhizosphere: Arsenic Speciation in the Soil to Plant Continuum
- 15 March 2019
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 53 (7), 3451-3463
- https://doi.org/10.1021/acs.est.8b07008
Abstract
The interplay between rice roots and manuring with respect to arsenic speciation, subsequent assimilation into roots, and translocation to shoots in paddy soil was investigated, alongside bacterial diversity characterization. Planting increased soil Eh and decreased soil solution arsenic species: inorganic arsenic (iAs), monomethylarsonic acid (MMA), trimethylarsenic oxide (TMAO) and dimethylarsinic acid (DMA). Presence of plant roots increased copy number of Clostridium and Tumebacillus 16S rRNA as well as Streptomyces arsenic methylating gene (arsM), but decreased Acidobacteria_GP1 16S rRNA and R. palustris BisB5 arsM. Sum of arsenic species decreased under root influence due to the interplay of inorganic arsenic mobilization in bulk soil under anaerobic and immobilization under oxygenated rhizospheric conditions. Manuring increased all soil solution arsenic species (>90%), shoot total arsenic (60%), copy number of Geobacter 16S rRNA and R. palustris TIE-1 arsM, indicative of a shift towards microbes with iron reduction and oxidation as well as arsenic methylation capabilities.Keywords
Funding Information
- Commonwealth Scholarship Commission
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