Arsenic modulates the composition of anode-respiring bacterial community during dry-wet cycles in paddy soils

Ya Jie Wang, Zheng Chen, Pan Pan Liu, Guo Xin Sun, Long Jun Ding, Yong Guan Zhu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Purpose: Bacteria able to extracelluar respiration, which could be enriched in the anode of microbial fuel cells (MFCs), play important roles in dissimilatory iron reduction and arsenic (As) desorption in paddy soils. However, the response of the bacteria to As pollution is unknown. Materials and methods: Using soil MFCs to investigate the effects of As on anode respiring bacteria (ARB) communities in paddy soils exposed to As stress. The soil MFC performances were evaluated by electrochemical methods. The bacterial community compositions on anodes were studied using Illumina sequencing. Results and discussion: In wet 1 phase, polarization curves of MFCs showed cathode potentials were enhanced at low As exposure but inhibited at high As exposure. In the meantime, anode potentials increased with As levels. The dry-wet alternation reduced As levels in porewater and their impacts on electrodes microorganisms. Arsenic addition significantly influenced the anode microbial communities. After dry-wet cycles, Deltaproteobacteria dominated in the anode with high As. Conclusions: The dynamic changes of the communities on cathodes and anodes of soil MFCs in paddy soils with different As addition might be explained by their different mechanisms for As detoxification. These results provide new insights into the microbial evolution in As-contaminated paddy soils.

Original languageEnglish
Pages (from-to)1745-1753
Number of pages9
JournalJournal of Soils and Sediments
Volume16
Issue number6
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Anode respiring bacteria
  • Arsenic
  • Dry-wet cycles
  • Paddy soils

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