Complexity of bacterial communities within the rhizospheres of legumes drives phenanthrene degradation
| Autor: | Xiaoyu Zai, Shuo Jiao, Qiaoping Li, Gehong Wei, Weimin Chen, Xuee Gao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Rhizosphere
Community biology Soil Science 04 agricultural and veterinary sciences 010501 environmental sciences Contamination Phenanthrene biology.organism_classification 01 natural sciences Vigna chemistry.chemical_compound Coronilla chemistry Agronomy Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Arable land 0105 earth and related environmental sciences |
| Zdroj: | Geoderma. 353:1-10 |
| ISSN: | 0016-7061 |
| DOI: | 10.1016/j.geoderma.2019.06.019 |
| Popis: | Determining the mechanisms underlying complex plant-microbe interactions and feedbacks is crucial for effective rhizoremediation of contaminated soils. Here, rhizosphere bacterial communities of 10 common legumes planted in arable and aged oil-contaminated soils for 90 days were used to degrade phenanthrene (PHE). Bacterial community structures were analyzed to reveal the mechanisms underlying the varying PHE degradation capacities. We found that bacterial β-diversity within the rhizospheres played a major role in predicting PHE degradation rates, and more complex bacterial communities exhibited higher PHE degradation capacities. The highest PHE degradation rates were obtained with bacterial communities of Coronilla varia and Vigna unguiculata planted in oil-contaminated soils (almost 80%). There were significant differences in bacterial community composition between arable and contaminated soils, and among different legumes rhizospheres and the unplanted soils, although minimal differences were observed in bacterial α-diversity. The potential degradation-related taxa were more abundant in bacterial communities from contaminated soils, indicating more effective PHE degradation than in arable soils. Network analysis revealed the vital ecological roles of the potential degradation-related taxa in the maintenance of complex associations among bacterial taxa. Oil contamination reduced the differences in bacterial community composition between rhizosphere soils with high and low PHE degradation rates. These results suggest that the formulation of effective rhizoremediation strategies ought to focus on more diverse and complex interactions between rhizosphere-inhabiting organisms from aged oil-contaminated soils through the selection of optimal plant-microbiota association. |
| Databáze: | OpenAIRE |
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