Arsenic (As) oxidation by core endosphere microbiome mediates As speciation in Pteris vittata roots

Xiaoxu Sun, Tianle Kong, Duanyi Huang, Zhenyu Chen, Max Kolton, Jinchan Yang, Yuqing Huang, Yue Cao, Peng Gao, Nie Yang, Baoqin Li, Huaqing Liu, Weimin Sun

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Pteris vittata is an arsenic(As)-hyperaccumulator that may be employed in phytoremediation of As-contaminated soils. P. vittata-associated microbiome are adapted to elevated As and may be important for host survival under stresses. Although P. vittata root endophytes could be critical for As biotransformation in planta, their compositions and metabolisms remain elusive. The current study aims to characterize the root endophytic community composition and As-metabolizing potentials in P. vittata. High As(III) oxidase gene abundances and rapid As(III) oxidation activity indicated that As(III) oxidation was the dominant microbial As-biotransformation processes compared to As reduction and methylization in P. vittata roots. Members of Rhizobiales were the core microbiome and the dominant As(III) oxidizers in P. vittata roots. Acquasition of As-metabolising genes, including both As(III) oxidase and As(V) detoxification reductase genes, through horizontal gene transfer was identified in a Saccharimonadaceae genomic assembly, which was another abundant population residing in P. vittata roots. Acquisition of these genes might improve the fitness of Saccharimonadaceae population to elevated As concentrations in P. vittata. Diverse plant growth promoting traits were encoded by the core root microbiome populations Rhizobiales. We propose that microbial As(III) oxidation and plant growth promotion are critical traits for P. vittata survival in hostile As-contaiminated sites.

Original languageEnglish
Article number131458
JournalJournal of Hazardous Materials
Volume454
DOIs
StatePublished - 15 Jul 2023

Keywords

  • Arsenic
  • Arsenite oxidation
  • Pteris vittata
  • Root endophyte

ASJC Scopus subject areas

  • Pollution
  • Waste Management and Disposal
  • Health, Toxicology and Mutagenesis
  • Environmental Engineering
  • Environmental Chemistry

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