化学
根际
有机质
农学
铵
生物利用度
水田
氮气循环
土壤pH值
环境化学
氮气
土壤水分
生物
细菌
生态学
有机化学
生物信息学
遗传学
作者
Yanhong Du,Jing Zhou,Guanhong Chen,Xiaomin Li,Liping Fang,Fangbai Li,Yuzhen Yuan,Xiangqin Wang,Yang Yang,Fei Dou
标识
DOI:10.1021/acs.jafc.2c07477
摘要
The bioavailability of arsenic (As) is influenced by ammonium (NH4+-N) fertilization, but the underlying mechanisms controlling As transformation in soil-rice systems are still not fully understood. The effects of two NH4+-N fertilizers, urea and NH4HCO3, on the transformation of As in a paddy soil with low organic matter content and transfer in rice plants were investigated. Treatments with urea and NH4HCO3 significantly increased arsenite (As(III)) concentration in porewater, bioavailable As in rhizosphere soil, and the relative abundance of the As(V) respiratory reductase gene (arrA) and As(III) methyltransferase gene (arsM). Furthermore, the relative expression of As transporter genes in rice roots, such as OsLsi1, OsLsi2, and OsLsi3, was upregulated, and the translocation efficiency of As(III) from rice roots to brown rice was promoted. Subsequently, As(III) accumulation in brown rice significantly increased. Therefore, attention should be paid to As-contaminated paddy fields with NH4+-N fertilization.
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