期刊
WATER RESEARCH
卷 45, 期 4, 页码 1629-1638出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2010.11.044
关键词
Phragmites australis; Rhizosphere; Pyrene; Benzo[a]pyrene; Accelerated biodegradation; Root exudates
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [21681010, 19710060]
- Grants-in-Aid for Scientific Research [21681010, 22710069, 19710060] Funding Source: KAKEN
We investigated the biodegradation of pyrene and benzo[a]pyrene in Phragmites australis rhizosphere sediment. We collected P. australis plants, rhizosphere sediments, and unvegetated sediments from natural aquatic sites and conducted degradation experiments using sediments spiked with pyrene or benzo[a]pyrene. Accelerated removal of pyrene and benzo[a]pyrene was observed in P. australis rhizosphere sediments with plants, whereas both compounds persisted in unvegetated sediments without plants and in autoclaved rhizosphere sediments with sterilized plants, suggesting that the accelerated removal resulted largely from biodegradation by rhizosphere bacteria. Initial densities of pyrene-utilizing bacteria were substantially higher in the rhizosphere than in unvegetated sediments, but benzo[a]pyrene-utilizing bacteria were not detected in rhizosphere sediments. Mycobacterium gilvum strains isolated from rhizosphere sediments utilized pyrene aerobically as a sole carbon source and were able to degrade benzo[a]pyrene when induced with pyrene. Phragmites australis root exudates containing phenolic compounds supported growth as a carbon source for the one Mycobacterium strain tested, and induced benzo[a] pyrene-degrading activity of the strain. The stimulatory effect on benzo[a]pyrene biodegradation and the amounts of phenolic compounds in root exudates increased when P. australis was exposed to pyrene. Our results show that Mycobacterium-root exudate interactions can accelerate biodegradation of pyrene and benzo[a]pyrene in P. australis rhizosphere sediments. (C) 2010 Elsevier Ltd. All rights reserved.
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