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题名:
Coupling between Nitrogen Fixation and Tetrachlorobiphenyl Dechlorination in a Rhizobium-Legume Symbiosis
作者: Wang, Xiaomi1,4; Teng, Ying1; Tu, Chen2; Luo, Yongming1,2; Greening, Chris3; Zhang, Ning1; Dai, Shixiang1,4; Ren, Wenjie1; Zhao, Ling1; Li, Zhengao1
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN号: 0013-936X
出版日期: 2018-02-20
卷号: 52, 期号:4, 页码:2217-2224
DOI: 10.1021/acs.est.7b05667
产权排序: 第2完成单位
通讯作者: Teng, Ying(Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China) ; Luo, Yongming(Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China)
英文摘要: Legume-rhizobium symbioses have the potential to remediate soils contaminated with chlorinated organic compounds. Here, the model symbiosis between Medicago sativa and Sinorhizobium meliloti was used to explore the relationships between symbiotic nitrogen fixation and transformation of tetrachlorobiphenyl PCB 77 within this association. 45-day-old seedlings in vermiculite were pretreated with 5 mg L-1 PCB 77 for 5 days. In PCB-supplemented nodules, addition of the nitrogenase enhancer molybdate significantly stimulated dechlorination by 7.2-fold and reduced tissue accumulation of PCB 77 (roots by 96% and nodules by 93%). Conversely, dechlorination decreased in plants exposed to a nitrogenase inhibitor (nitrate) or harboring nitrogenase-deficient symbionts (nifA mutant) by 29% and 72%, respectively. A range of dechlorinated products (biphenyl, methylbiphenyls, hydroxylbiphenyls, and trichlorobiphenyl derivatives) were detected within nodules and roots under nitrogen-fixing conditions. Levels of nitrogenase-derived hydrogen and leghemoglobin expression correlated positively with nodular dechlorination rates, suggesting a more reducing environment promotes PCB dechlorination. Our findings demonstrate for the first time that symbiotic nitrogen fixation acts as a driving force for tetrachlorobiphenyl dechlorination. In turn, this opens new possibilities for using rhizobia to enhance phytoremediation of halogenated organic compounds.
研究领域[WOS]: Engineering ; Environmental Sciences & Ecology
项目资助者: National Natural Science Foundation of China(41371309, 41671327, 41230858) ; Outstanding Youth Fund of Jiangsu Province(BK20150049) ; ARC DECRA Fellowship(DE170100310)
关键词[WOS]: ZEA-MAYS L. ; POLYCHLORINATED-BIPHENYLS ; OXIDATIVE STRESS ; PHANEROCHAETE-CHRYSOSPORIUM ; SINORHIZOBIUM-MELILOTI ; MEDICAGO-TRUNCATULA ; NITRATE REDUCTASE ; MOLYBDENUM ; ALFALFA ; SOILS
文章类型: Article
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000426143300059
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.yic.ac.cn/handle/133337/23577
Appears in Collections:中科院海岸带环境过程与生态修复重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China
3.Monash Univ, Sch Biol Sci, Clayton, Vic 3800, Australia
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Wang, Xiaomi,Teng, Ying,Tu, Chen,et al. Coupling between Nitrogen Fixation and Tetrachlorobiphenyl Dechlorination in a Rhizobium-Legume Symbiosis[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(4):2217-2224.
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