Decreasing arsenic in rice: Interactions of soil sulfate amendment and water management

Fang, Xu; Christl, Iso; Blanco, Andrea E. Colina; Planer-Friedrich, Britta; Zhao, Fang‐Jie; Kretzschmar, Ruben

doi:10.1016/j.envpol.2023.121152

Cited by 16 publications

(1 citation statement)

References 83 publications

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“…Besides water management, sulfate fertilization is a promising tool to decrease arsenic contamination in rice grain, acting both at the plant (i.e. synthesis of phytochelatins) and at the soil level (Dahlawi et al 2018 , Zou et al 2018 , Chen et al 2019 , Hu et al 2007 , 2021 , Fang et al 2023 ). The decreased concentration of arsenic in the pore water of sulfate-amended rice paddy soil was positively related to the presence of rhizospheric dissimilatory sulfate-reducing microorganisms (DSRM) (Jia et al 2015 ) that, by producing sulfide in anoxic conditions at circumneutral pH, contribute to the removal of arsenic by secondary iron sulfides (Hu et al 2007 , Burton et al 2014 , Xu et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Microbial communities in paddy soils: differences in abundance and functionality between rhizosphere and pore water, the influence of different soil organic carbon, sulfate fertilization and cultivation time, and contribution to arsenic mobility and speciation

Zecchin,

Wang,

Martin

et al. 2023

FEMS Microbiology Ecology

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Abiotic factors and rhizosphere microbial populations influence arsenic accumulation in rice grains. Despite mineral and organic surfaces are keystones in element cycling, localization of specific microbial reactions in the root/soil/pore water system is still unclear. Here, we tested if original unplanted soil, rhizosphere soil, and pore water represented distinct ecological microniches for arsenic-, sulfur- and iron-cycling microorganisms and compared the influence of relevant factors such as soil type, sulfate fertilization, and cultivation time. In rice open-air-mesocosms with two paddy soils (2.0% and 4.7% organic carbon), Illumina 16S rRNA gene sequencing demonstrated little significant effects of cultivation time and sulfate fertilization that decreased Archaea-driven microbial networks and incremented sulfate reducing and sulfur oxidizing bacteria. Different compartments, characterized by different bacterial and archaeal compositions, had the strongest effect with higher microbial abundances, bacterial biodiversity and interconnections in the rhizosphere versus pore water. Within each compartment, a significant soil type effect was observed. Higher percentage contributions of rhizosphere dissimilatory arsenate- and iron-reducing, arsenite-oxidizing, and, surprisingly, dissimilatory sulfate-reducing bacteria as well as pore water iron-oxidizing bacteria in the lower organic carbon soil supported previous chemistry-based interpretations of a more active S-cycling, a higher percentage of thioarsenates, and lower arsenic mobility by sorption to mixed Fe(II)Fe(III)-minerals in this soil.

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Section: Introductionmentioning

confidence: 99%

Microbial communities in paddy soils: differences in abundance and functionality between rhizosphere and pore water, the influence of different soil organic carbon, sulfate fertilization and cultivation time, and contribution to arsenic mobility and speciation

Zecchin,

Wang,

Martin

et al. 2023

FEMS Microbiology Ecology

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Contrasting roles of rice root iron plaque in retention and plant uptake of silicon, phosphorus, arsenic, and selenium in diverse paddy soils

Linam,

Limmer,

Seyfferth

2024

Plant Soil

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Background and aims Iron (Fe) plaque on rice roots is a mixture of Fe oxide and oxyhydroxide minerals thought to protect rice from high levels of arsenic (As) in flooded paddy soils. Silicon (Si), phosphorus (P), and selenium (Se) also exist as oxyanions in rice paddies, but the impacts of Fe plaque on uptake of these nutrients are unknown. Methods We used natural variation in paddy soil chemistry to test how Si, P, As, and Se move from porewater to plaque to plant via multiple techniques. In a pot study, we monitored Fe plaque deposition and porewater chemistry in 5 different soils over time and measured plaque/plant chemistry and Fe plaque mineralogy at harvest. We normalized oxyanion concentrations by Fe to determine the preferential retention on plaque or plant uptake. Results Low phosphorus availability increased root Fe-oxidizing activity, while Fe, Si, P, As, and Se concentrations in plaque were strongly correlated with porewater. Plaque did not appreciably retain Si and Se, and the oxyanions did not compete for adsorption sites on the Fe plaque. Conclusion Root Fe plaque seems to protect rice from As uptake, does not interfere with Si and Se uptake, and roots adapt to maintain P nutrition even with retention of porewater P on plaque.

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Impact of Biochar and Water Regimes on Arsenic Transfer and Uptake in Rice: Insights into Transporter Behaviour and Soil–Plant Dynamics

Khanam,

Tripathy,

Chidambaranathan

et al. 2024

Expo Health

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Decreasing arsenic in rice: Interactions of soil sulfate amendment and water management

Cited by 16 publications

References 83 publications

Microbial communities in paddy soils: differences in abundance and functionality between rhizosphere and pore water, the influence of different soil organic carbon, sulfate fertilization and cultivation time, and contribution to arsenic mobility and speciation

Microbial communities in paddy soils: differences in abundance and functionality between rhizosphere and pore water, the influence of different soil organic carbon, sulfate fertilization and cultivation time, and contribution to arsenic mobility and speciation

Contrasting roles of rice root iron plaque in retention and plant uptake of silicon, phosphorus, arsenic, and selenium in diverse paddy soils

Impact of Biochar and Water Regimes on Arsenic Transfer and Uptake in Rice: Insights into Transporter Behaviour and Soil–Plant Dynamics

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