Journal of Pesticide Science
Online ISSN : 1349-0923
Print ISSN : 1348-589X
Original Articles
A new endosulfan-degrading fungus, Mortierella species, isolated from a soil contaminated with organochlorine pesticides
Ryota KataokaKazuhiro TakagiFuta Sakakibara
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2010 Volume 35 Issue 3 Pages 326-332

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Abstract

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 α and β-endosulfan, respectively, over 28 days at 25°C, whereas 8.2 μM of each a and β-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 hyphae 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.

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© 2010 Pesticide Science Society of Japan
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