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Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis
Tu, Chen1; Luo, Yongming1,2; Teng, Ying2; Christie, Peter2
2018-03-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
Volume61Issue:3Pages:285-291
Abstract

Chlorinated persistent organic pollutants, including polychlorinated biphenyls (PCBs), represent a particularly serious environmental problem and human health risk worldwide. Leguminous plants and their symbiotic bacteria (rhizobia) are important components of the biogeochemical cycling of nitrogen in both agricultural and natural ecosystems. However, there have been relatively few detailed studies of the remediation of PCB-contaminated soils by legume-rhizobia symbionts. Here we report for the first time evidence of the reductive dechlorination of 2,4,4'-trichlorobiphenyl (PCB 28) by an alfalfa-rhizobium nitrogen fixing symbiont. Alfalfa (Medicago sativa L.) inoculated with wild-type Sinorhizobium meliloti had significantly larger biomass and PCB 28 accumulation than alfalfa inoculated with the nitrogenase negative mutant rhizobium SmY. Dechlorination products of PCB 28, 2,4'-dichlorobiphenyl (PCB 8), and the emission of chloride ion (Cl-) were also found to decrease significantly in the ineffective nodules infected by the mutant strain SmY. We therefore hypothesize that N2-fixation by the legume-rhizobium symbiont is coupled with the reductive dechlorination of PCBs within the nodules. The combination of these two processes is of great importance to the biogeochemical cycling and bioremediation of organochlorine pollutants in terrestrial ecosystems.

KeywordBiogeochemical Cycling Legume-rhizobia Symbiosis Microbe-assisted Phytoremediation Nitrogen Fixation Polychlorinated Biphenyls Soil Pollution And Remediation Reductive Dechlorination
Department中科院海岸带环境过程与生态修复重点实验室
Subject Area环境科学
DOI10.1007/s11430-017-9131-9
URL查看原文
Indexed BySCI
WOS KeywordSinorhizobium-meliloti ; Organic Pollutants ; Contaminated Soil ; Phytoremediation ; Pcbs ; Bioremediation ; Degradation ; Biodegradation ; Remediation ; Alfalfa
SubtypeArticle
Language英语
Funding ProjectNational Natural Science Foundation of China
WOS Research AreaGeology
WOS IDWOS:000426574800004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.yic.ac.cn/handle/133337/23579
Collection中科院海岸带环境过程与生态修复重点实验室
Corresponding AuthorLuo, Yongming
Affiliation1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat
2.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat
First Author AffilicationYantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Corresponding Author AffilicationYantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tu, Chen,Luo, Yongming,Teng, Ying,et al. Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis[J]. SCIENCE CHINA-EARTH SCIENCES,2018,61(3):285-291.
APA Tu, Chen,Luo, Yongming,Teng, Ying,&Christie, Peter.(2018).Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis.SCIENCE CHINA-EARTH SCIENCES,61(3),285-291.
MLA Tu, Chen,et al."Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis".SCIENCE CHINA-EARTH SCIENCES 61.3(2018):285-291.
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