The mechanism of nitrate-Cr(VI) reduction mediated by microbial under different initial pHs

Hu, Yutian; Chen, Nan; Liu, Tong; Ma, Linlin; Chen, Si; Li, Miao

doi:10.1016/j.jhazmat.2020.122434

Cited by 40 publications

(7 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It indicated that azoreductase was involved in Cr(VI) reduction process of strain ABF1. A recent metatranscriptomic study also reported that azoR gene showed a significant enhancement (10.03‐ and 24.95‐fold with pH 9.0 and 10.0 respectively) when treated with 10 mg L −1 Cr(VI) (Hu et al ., 2020). The recombinant pET‐15b‐ azoR was overexpressed in E .…”

Section: Resultsmentioning

confidence: 99%

Exploration on the Cr(VI) resistance mechanism of a novel thermophilic Cr(VI)‐reducing bacteria Anoxybacillus flavithermusABF1 isolated from Tengchong geothermal region, China

Yang

Hong

Huang

et al. 2022

Environ Microbiol Rep

View full text Add to dashboard Cite

Hexavalent chromium resistance and reduction mechanisms of microorganism provide a critical guidance for Cr(VI) bioremediation. However, related researches are limited in mesophiles and deficient for thermophiles. In this work, a novel alkaline Cr(VI)-reducing thermophile Anoxybacillus flavithermus ABF1 was isolated from geothermal region. The mechanisms of Cr(VI) resistance and reduction were investigated. The results demonstrated that A. flavithermus ABF1 could survive in a wide temperature range from 50 C to 70 C and in pH range of 7.0-9.0. Strain ABF1 showed excellent growth activity and Cr(VI) removal performance when initial Cr(VI) concentration was lower than 200 mg L À1 . 93.71% of Cr(VI) was removed at initial concentration of 20 mg L À1 after 72 h. The majority of Cr(VI) was found to be reduced extracellularly by enzymes secreted by cells. XPS and Raman analysis further manifested that Cr 2 O 3 was the product of Cr(VI) reduction. Moreover, the Cr(VI) transportation-related gene cysP and Cr(VI) reduction-related gene azoR of A. flavithermus ABF1 played key roles in inhibiting Cr(VI) entering cells and promoting extracellular Cr(VI) reduction respectively. This work provides novel insight into the mechanisms of Cr(VI) resistance and detoxication of thermophiles, which leads to a promising alternative strategy for heavy metal bioremediation in areas with elevated temperature.

show abstract

Section: Resultsmentioning

confidence: 99%

Exploration on the Cr(VI) resistance mechanism of a novel thermophilic Cr(VI)‐reducing bacteria Anoxybacillus flavithermusABF1 isolated from Tengchong geothermal region, China

Yang

Hong

Huang

et al. 2022

Environ Microbiol Rep

View full text Add to dashboard Cite

show abstract

“…Cells were crushed and separated to determine the principal species of reductase involved in nitrate and V( v ) reduction. 8 Detailed information is shown in the ESI †…”

Section: Methodsmentioning

confidence: 99%

“…2 In the denitrification process, Rhodocyclaceae will exhibit the accumulation of nitrite due to the lack of a nitrite reduction pathway, so it is necessary to cooperate with other denitrifying microbes to achieve complete denitrification. 8 Methylomonas / Stenotrophomonas / Steroidobacter / Betaproteobacteria / Bacteroidetes BD2–2 / Mollicutes / Actinobacteria are dominant in reactors with methane and hydrogen, with nitrate and V( v ) as co-pollutants, respectively. 9,10 Different types of carbon sources, pollutants, and nutrient supply patterns facilitate the formation of different community taxonomic compositions.…”

Section: Introductionmentioning

confidence: 99%

Differences in microbial diversity, composition and function during V(v) release and reduction in nitrate–V(v) co-contaminated water from liquid carbon sources

Wang

Chen

Feng

et al. 2023

Environ. Sci.: Water Res. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Studies have proved that different pH conditions will significantly affect the reduction of Cr(VI) by microorganisms. When the optimum pH is reached, relevant functional genes will be significantly up-regulated.Then the pollutants can be completely removed, and the pathways for degradation and energy metabolism will be more abundant (Hua et al, 2020).…”

Section: Responses Of Environmental Factors Of Rhizosphere Soils and ...mentioning

confidence: 99%

Effects of Cr stress on bacterial community structure and diversity in rhizosphere soils of Iris pseudacorus

Wei¹,

Zhu²,

Yang³

et al. 2022

Preprint

View full text Add to dashboard Cite

Rhizosphere microorganisms play an important role in improving soil microenvironment, which contributes to plant growth under heavy metal stress. However, the effect of chromium (Cr) on plant rhizosphere bacterial community is still unknown. In this paper, sole-cultivated pattern, two-cultivated pattern and three-cultivated pattern, combined with 16S rRNA high-throughput sequencing technology, the effects of Cr stress on bacterial community structure and diversity in rhizosphere soil of Iris Pseudacorus were analyzed. The results showed that under Cr stress, I. Pseudacorus showed good tolerance and enrichment. However, under Cr stress, the Alpha diversity indices (Shannon, Chao and Sobs) of rhizosphere bacterial community decreased by 9.1%, 30.3% and 28.0% on average, respectively. The change of bacterial community was 22.6% due to Cr stress, and the common species of bacterial community decreased by 4.2%. Proteobacteria, Actinobacteria, Acidobacteria, Firmicutes and Gemmatimonadetes accounted for more than 78.2% of the total sequence. With the increase of plant diversity, Bacteroides and Pseudomonas appeared successively, and the abundance of the dominant species increased obviously. Through the symbiotic network diagram, it was found that the synergistic effect between dominant species in two-cultivated pattern was significantly enhanced, and the soil microenvironment was significantly improved. In conclusion, the results of this study will provide a reference for understanding the response of rhizosphere bacterial community to heavy metal Cr and the interaction between wetland plants and rhizosphere bacteria during wetland phytoremediation.

show abstract

The mechanism of nitrate-Cr(VI) reduction mediated by microbial under different initial pHs

Cited by 40 publications

References 51 publications

Exploration on the Cr(VI) resistance mechanism of a novel thermophilic Cr(VI)‐reducing bacteria Anoxybacillus flavithermusABF1 isolated from Tengchong geothermal region, China

Exploration on the Cr(VI) resistance mechanism of a novel thermophilic Cr(VI)‐reducing bacteria Anoxybacillus flavithermusABF1 isolated from Tengchong geothermal region, China

Differences in microbial diversity, composition and function during V(v) release and reduction in nitrate–V(v) co-contaminated water from liquid carbon sources

Effects of Cr stress on bacterial community structure and diversity in rhizosphere soils of Iris pseudacorus

Contact Info

Product

Resources

About