Microbial communities in rice rhizosphere altered by intermittent and continuous flooding in fields with long-term arsenic application

Somenahally, Anil; Hollister, Emily B.; Loeppert, Richard H.; Wang, Yan; Gentry, Terry J.

doi:10.1016/j.soilbio.2011.02.011

Cited by 78 publications

(38 citation statements)

References 51 publications

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“…Under the flooding conditions, Fe-reducing bacteria are abundant that reduce Fe-oxyhydroxides and increase the arsenic solubility in soil [171]; it also promotes the transformation of As V to As III and methylated arsenic species. The experiment conducted by Somennahally et al [166] in both continuous and intermittent flooding showed that total arsenic concentrations in the rhizospheric soil and grains were significantly decreased in intermittent flooding conditions than continuous flooding, which is supported by other studies [167,172].…”

Section: Water Management and Irrigation Practicessupporting

confidence: 55%

“…Water management in paddy field is one of the best approaches in controlling arsenic bioavailability in the soil-plant system [166]. A water-saving regime has been reported to be an immediate and sustainable solution to decrease arsenic contents in rice [34].…”

Section: Water Management and Irrigation Practicesmentioning

confidence: 99%

“…To reduce the arsenic in rice grains, sprinkler irrigation practice is also having positive impacts [169,170]. Differential irrigation practices also influence the Fe-plaque formation and arsenic uptake by rice [166]. Under the flooding conditions, Fe-reducing bacteria are abundant that reduce Fe-oxyhydroxides and increase the arsenic solubility in soil [171]; it also promotes the transformation of As V to As III and methylated arsenic species.…”

Section: Water Management and Irrigation Practicesmentioning

confidence: 99%

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Arsenic Accumulation in Rice and Probable Mitigation Approaches: A Review

Mitra¹,

et al. 2017

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According to recent reports, millions of people across the globe are suffering from arsenic (As) toxicity. Arsenic is present in different oxidative states in the environment and enters in the food chain through soil and water. In the agricultural field, irrigation with arsenic contaminated water, that is, having a higher level of arsenic contamination on the top soil, which may affects the quality of crop production. The major crop like rice (Oryza sativa L.) requires a considerable amount of water to complete its lifecycle. Rice plants potentially accumulate arsenic, particularly inorganic arsenic (iAs) from the field, in different body parts including grains. Different transporters have been reported in assisting the accumulation of arsenic in plant cells; for example, arsenate (As V ) is absorbed with the help of phosphate transporters, and arsenite (As III ) through nodulin 26-like intrinsic protein (NIP) by the silicon transport pathway and plasma membrane intrinsic protein aquaporins. Researchers and practitioners are trying their level best to mitigate the problem of As contamination in rice. However, the solution strategies vary considerably with various factors, such as cultural practices, soil, water, and environmental/economic conditions, etc. The contemporary work on rice to explain arsenic uptake, transport, and metabolism processes at rhizosphere, may help to formulate better plans. Common agronomical practices like rain water harvesting for crop irrigation, use of natural components that help in arsenic methylation, and biotechnological approaches may explore how to reduce arsenic uptake by food crops. This review will encompass the research advances and practical agronomic strategies on arsenic contamination in rice crop.

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Section: Water Management and Irrigation Practicessupporting

confidence: 55%

Section: Water Management and Irrigation Practicesmentioning

confidence: 99%

Section: Water Management and Irrigation Practicesmentioning

confidence: 99%

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Arsenic Accumulation in Rice and Probable Mitigation Approaches: A Review

Mitra¹,

et al. 2017

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“…Thermocycling consisted of an initial denaturation at 95 C for 15 min, followed by 40 cycles of 95 C for 1 min and annealing temperature at 53 C for 30 s, and 72 C for 1 min. Plasmid standards for determining copy number and fungal relative abundance by qPCR were generated as described by Somenahally et al (2011). Melting curve analysis was conducted to ensure no primer-dimer bindings.…”

Section: Quantitative Pcrmentioning

confidence: 99%

Impact of brassicaceous seed meals on the composition of the soil fungal community and the incidence of Fusarium wilt on chili pepper

Gentry

et al. 2015

Applied Soil Ecology

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“…Although the growth medium used in the present study was sterilized, mycorrhiza formation could have stimulated associated microorganisms (Smith and Read 2008), and the experiment was carried out in open air where other microbes could potentially be reintroduced. The abundance or activities of anaerobic microorganisms for As methylation in soil are likely to be stimulated especially under flooding conditions (Somenahally et al 2011a(Somenahally et al , 2011bZhao et al 2013), which could have contributed to the dramatically higher proportion of DMA in the grain under flooding conditions compared with that under aerobic conditions. While R. irregularis inoculation potentially contributed to iAs methylation into DMA in the grain of B47 rice, the AMF did not seem to be involved in As methylation for the B29 variety.…”

Section: Discussionmentioning

confidence: 99%

Water management, rice varieties and mycorrhizal inoculation influence arsenic concentration and speciation in rice grains

Zhang

Ren

et al. 2015

Mycorrhiza

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A pot experiment was carried out to investigate the effects of water management and mycorrhizal inoculation on arsenic (As) uptake by two rice varieties, the As-resistant BRRI dhan 47 (B47) and As-sensitive BRRI dhan 29 (B29). Grain As concentration of B47 plants was significantly lower than that of B29, and grain As concentration of B47 was higher under flooding conditions than that under aerobic conditions. In general, mycorrhizal inoculation (Rhizophagus irregularis) had no significant effect on grain As concentrations, but decreased the proportion of inorganic arsenic (iAs) in grains of B47. The proportion of dimethylarsinic acid (DMA) in the total grain As was dramatically higher under flooding conditions. Results demonstrate that rice variety selection and appropriate water management along with mycorrhizal inoculation could be practical countermeasures to As accumulation and toxicity in rice grains, thus reducing health risks of As exposure in rice diets.

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Microbial communities in rice rhizosphere altered by intermittent and continuous flooding in fields with long-term arsenic application

Cited by 78 publications

References 51 publications

Arsenic Accumulation in Rice and Probable Mitigation Approaches: A Review

Arsenic Accumulation in Rice and Probable Mitigation Approaches: A Review

Impact of brassicaceous seed meals on the composition of the soil fungal community and the incidence of Fusarium wilt on chili pepper

Water management, rice varieties and mycorrhizal inoculation influence arsenic concentration and speciation in rice grains

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