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摘要
Two new aerobic endosulfan-degrading fungal strains, Mortierella sp. strains W8 and Cm1-45, were isolated from soil contaminated with organochlorine pesticides. This is the first report on the biodegradation of endosulfan by Zygomycota. The strains isolated in this work degraded more than 70% and 50% of alpha and beta-endosulfan, respectively, over 28 days at 25 degrees C, whereas 8.2 mu M of each a and beta-endosulfan was added as the initial concentration in liquid cultures. Only a small amount of endosulfan sulfate, a persistent metabolite, was detected in both cultures, while these strains could not degrade endosulfan sulfate when incubated with endosulfan sulfate as the initial substrate. Both strains generate endosulfan diol as a first step in the degradation of endosulfan and then undergo further conversion to endosulfan lactone. The formation of these intermediates was confirmed by GC-MS. Mortierella spp. might be present as hyphac in contaminated soil because they were isolated using the soil washing method; therefore, these Mortierella spp. strains have potential for the bioremediation of contaminated sites with endosulfan.
- 出版日期2010
