期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 438, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129492
关键词
Elsholtzia splendens; Phenanthrene; Polychlorinated biphenyl; Microbial degradation; Stable isotope probing
资金
- National Natural Science Founda-tion of China [32061133003]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z134]
- Natural Science Foundation of Guangdong, China [2022A1515010890]
- Science and Technology Planning Project of Guangdong, China [2021B1212040008]
This study reveals the underlying mechanism of the advantages of heavy metal-tolerant plants for organic pollutant removal in soils co-contaminated with heavy metals. The mechanism involves the construction of rhizospheric microbial community and shifts in the degrader community and genes.
Co-contamination of heavy metals and organic pollutants is widespread in the environment. Metal-tolerant/ hyperaccumulating plants have the advantage of enhancing co-operation between plants and rhizospheric microbes under heavy metal stress, but the underlying mechanism remains unclear. In the present study, the effects of Elsholtzia splendens and Lolium perenne on the rhizospheric microbial community and degraders of phenanthrene (PHE) and polychlorinated biphenyls (PCBs) were investigated. The results showed E. splendens could tolerate high Cu concentrations, while L. perenne was sensitive to Cu toxicity. Although Cu played the most important role in microbial community construction, both E. splendens and L. perenne caused shifts in the rhizospheric microbial community. For PHE and PCB degradation, L. perenne was more efficient under low Cu concentrations, whereas E. splendens performed better under high Cu concentrations. This difference can be attributed to shifts in the degrader community and key degradation genes identified by stable isotope probing. Moreover, higher abundances of various genes for organic pollutant degradation were observed in the rhizosphere of E. splendens than L. perenne based on gene prediction under high Cu stress. Our study reveals underlying mechanism of the advantages of heavy metal-tolerant plants for organic pollutant removal in soils co -contaminated with heavy metals.
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