Institute for Global Food Security , Queen's University Belfast , David Keir Building, Malone Road , Belfast , BT9 5BN , United Kingdom.
Institute of Environment and Sustainable Development in Agriculture , Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Environment, Ministry of Agriculture , Beijing 100081 , P.R. China.
Environ Sci Technol. 2019 Apr 2;53(7):3451-3463. doi: 10.1021/acs.est.8b07008. Epub 2019 Mar 22.
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, monomethylarsonic acid, trimethylarsenic oxide, and dimethylarsinic acid. Presence of plant roots increased the copy number of Clostridium and Tumebacillus 16S rRNA as well as Streptomyces arsenic methylating gene ( arsM), but decreased Acidobacteria_GP1 16S rRNA and Rhodopseudomonas. 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.
研究了水稻根系与施肥之间的相互作用，以及砷形态、随后被根系吸收和向地上部转移的情况，同时还对细菌多样性进行了特征描述。种植增加了土壤 Eh 值，降低了土壤溶液中的砷形态：无机砷、一甲基砷酸、三甲基氧化砷和二甲基砷酸。植物根系的存在增加了梭菌和 Tumebacillus 16S rRNA 的拷贝数以及 Streptomyces 砷甲基化基因（arsM），但降低了 Acidobacteria_GP1 16S rRNA 和 Rhodopseudomonas. palustris BisB5 arsM。由于在厌氧条件下 bulk 土壤中无机砷的迁移以及在有氧根际条件下的固定，根系的影响下，砷形态的总和减少。施肥增加了所有土壤溶液中的砷形态（>90%）、地上部总砷（60%）、Geobacter 16S rRNA 的拷贝数以及 R. palustris TIE-1 arsM，表明微生物向具有铁还原和氧化以及砷甲基化能力的方向转变。
