Arsenite-oxidizing bacteria isolated from an abandoned realgar mining area: Characterization and the influence on arsenic accumulation in rice seedlings

Xiao, Weiwei; He, Xiao-Song; Lin, Guobing; Yang, Zhaoguang; Wang, Lin

doi:10.1016/j.eti.2021.101800

Cited by 7 publications

(3 citation statements)

References 46 publications

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“…The As( )-oxidizing strain SMS11 (genus Pseudomonas, NCBI GenBank accession No. MW940738) obtained in our previous study [22] was introduced in this work. Prior to inoculation, the strain was cultured in 100 mL of chemically de ned medium (CDM, the detailed information is provided in Text 1 of Supplementary Materials) at 150 rpm and 25℃ till logarithmic phase (OD 600 = 0.4 ~ 0.5).…”

Section: As(iii)-oxidizing Bacteria Preparationmentioning

confidence: 99%

“…In the environment, microorganisms play a key role on As speciation and migration under the ooded conditions [21]. As(III)-oxidizing bacteria isolated from As-contaminated soils possessed the capacity to convert As(III) to As(V) much more e ciently than natural oxidation process [22,23]. As(V) with high a nity to Fe oxide/hydroxide is less toxic and less mobile than As(III).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, ionomic variation of rice plants would be another important indicator in response of external As stress. The As(III)-oxidizing strain SMS11 described in our previous study [22] was employed to mitigate As(III) stress to the rice plants in this work. The plant biomass, As translocation and As speciation were measured to evaluate the impacts on the rice plants with and without bacterium inoculation.…”

Section: Introductionmentioning

confidence: 99%

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As(III)-Oxidizing Bacteria Alleviate Arsenite Toxicity via Reducing As Accumulation, Elevating Antioxidative Activities and Modulating Ionome in Rice (Oryza sativa L.)

et al. 2023

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Compared to other crops, paddy rice trends to accumulate more arsenic (As) from soils. The toxicity and mobility of As mainly depended on its chemical species. To mitigate As(III) stress to rice plants, As(III)oxidizing strain SMS11 isolated from As-contaminated soils was employed in the current study. The rice seedlings were hydroponically cultivated in three groups: Control Group (without any addition), As(III) group (amended with 1 mg•L -1 As(III)) and As(III)+B group (treated with As(III) and As(III)-oxidizing bacteria). Compared to Control group, the growth of rice shoots from As(III) group was signi cantly restricted. Inoculation with the bacteria could not only enhance the growth of the rice plants, but also signi cantly reduce the As level in the rice shoots. Evaluation of oxidative stress indices showed that superoxide dismutase activity in the rice plants was enhanced under As(III) stress, resulting in promoted inhibition ability of superoxide anion radical (O 2•− ). The activity of catalase in the rice shoots was weakened when exposed to As(III), increasing the risk of hydroxyl radical ( • OH) formation. When cocultivated with the bacteria, • OH formation was signi cantly inhibited in the rice shoots. Uptake of As elevated most nutrient element contents in the rice shoots simultaneously. The levels of most nutrient elements in the rice shoots were declined with alleviation of As stress after inoculation with the bacteria. The ionomics of the rice plants revealed signi cant variations with tissues and environmental conditions.The results represented ionomic pro le as a promising tool to identify rice plants under different external conditions.

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Section: As(iii)-oxidizing Bacteria Preparationmentioning

confidence: 99%