Effects of root exudates of clover (Trifolium repens) on PAH microbial degradation and dioxygenase
Wang, Y.; Guo, M.-X.; Jin, J.-H.; Gong, Z.-Q.; Jia, C.-Y.; Li, X.-J.; Zhang, W.
Ying Yong Sheng Tai Xue Bao 25(11): 3145-3151
2014
ISSN/ISBN: 1001-9332 PMID: 25898610 Document Number: 676628
To demonstrate rhizospheric effect on the mechanism of (polycyclic aromatic hydrocarbon) PAH degradation, and to establish a proper joint phyto-microbial remediation mode, microcosms containing microorganisms and PAHs (pyrene and benzopyrene degradation rates increased significantly, and the proportion of dioxygenase gene to 16S rDNA of Mycobacterium M1 increased. In the biodegradation process, dioxygenase gene copy number increased significantly, whereas 16S rDNA copy number increase was not so obvious, showing that the former was related to degradation process, but the latter was related to microbial numbers. It was concluded that the clover root exudates promoted the dioxygenase gene copy number of Mycobacterium M1, which contributed to the degradation of PAHs.