1. Arsenic-enrichment enhanced root exudates and altered rhizosphere microbial communities and activities in hyperaccumulator Pteris vittata.
- Author
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Das S, Chou ML, Jean JS, Yang HJ, and Kim PJ
- Subjects
- Adsorption, Amines chemistry, Bacteria metabolism, Biodegradation, Environmental, Catalysis, Hydrogen-Ion Concentration, Ions, Kinetics, Microscopy, Electron, Scanning, Pteris drug effects, Soil chemistry, Soil Pollutants chemistry, Spectroscopy, Fourier Transform Infrared, Temperature, Water chemistry, Arsenic chemistry, Plant Exudates chemistry, Pteris growth & development, Rhizosphere, Soil Microbiology, Water Pollutants, Chemical chemistry
- Abstract
Phytoremediation of arsenic (As)-contaminated soil by hyperaccumulator Pteris vittata is promising. A better understanding of the rhizosphere microbial dynamics that regulate As availability and plant growth is important to optimize the phytoremediation process. In this study, Illumina sequencing of 16S rRNA genes was applied to assess the rhizosphere microbial community structure of P. vittata. Microbial functionality was monitored by soil enzyme activities and MPN-PCR targeting genes of interest. Arsenic (100mgkg
-1 AsV) addition to soil significantly increased DOC, root exudates, As and P uptake and the frond biomass of P. vittata. Moreover, As-enrichment significantly increased soil enzyme activities involved in N, P and S cycling and the gene abundance of As transforming bacteria, Fe- and S-reducing bacteria and N and C fixing bacteria in the rhizosphere of P. vittata. Together, the results revealed that the combined selective pressure of As and rhizosphere resulted in stimulation of microbial community, which most likely has a role in reductive dissolution of Fe and S, As and P mobilization, C degradation and fixation, and N fixation. These changes appeared to have a role in mitigation of As toxicity and to promote growth and the As uptake ability of P. vittata under As-enriched conditions., (Copyright © 2016 Elsevier B.V. All rights reserved.)- Published
- 2017
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