Long-term effectiveness of microbe-assisted arsenic phytoremediation by Pteris vittata in field trials

Chongyang Yang, Ying Ning Ho, Chihiro Inoue, Mei Fang Chien

Research output: Contribution to journalArticle

Abstract

Phytoremediation is a promising inexpensive method of detoxifying arsenic (As) contaminated soils using plants and associated soil microorganisms. The potential of Pteris vittata to hyperaccumulate As contamination has been investigated widely. Since As(V) is efficiently taken up by P. vittata than As(III), As speciation by associated rhizobacteria could offer enormous possibility to enhance As phytoremediation. Specifically, increased rhizobacteria mediated As(III) to As(V) conversion appeared to be a crucial step in As mobilization and translocation. In this study, Pseudomonas vancouverensis strain m318 with the potential to improve As phytoremediation was inoculated to P. vittata in a field trial for three years to evaluate its long-term efficacy and stability for enhancing As phytoextraction. The biomass, As concentration, and As accumulation of ferns showed to be increased by inoculation treatment. Although this trend occasionally declined which may be accounted to lower As concentration in soil and amount of precipitation during experiments, the potential of inoculation was observed in increased enrichment coefficients. Further, the arsenite oxidase (aioA-like) genes in the rhizosphere were detected to evaluate the influence of inoculation on As phytoremediation. The findings of this study suggested the potential application of rhizosphere regulation to improve phytoremediation technologies for As contaminated soils. However, the conditions which set the efficacy of this method could be further optimized.

Original languageEnglish
Article number140137
JournalScience of the Total Environment
Volume740
DOIs
Publication statusPublished - 2020 Oct 20

Keywords

  • Arsenic
  • Inoculation
  • Long-term field trial
  • Phytoremediation
  • Pteris vittata

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Fingerprint Dive into the research topics of 'Long-term effectiveness of microbe-assisted arsenic phytoremediation by Pteris vittata in field trials'. Together they form a unique fingerprint.

  • Cite this