Biodegradation of lindane pesticide by non white- rots soil fungus <Emphasis Type="Italic">Fusarium</Emphasis> sp. |
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Authors: | Veena Sagar D P Singh |
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Institution: | (1) Department of Environmental Science, Babasaheb Bhimrao Ambedkar (Central) University, Raibarelly Road, Lucknow, 226025, India |
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Abstract: | Lindane or γ- hexachlorocyclohexane (γ-HCH) is a chlorinated pesticide and its toxic effects on biota necessitate its removal.
Microbial degradation is an important process for pesticide bioremediation and the role of soil fungi in recycling of organic
matter prompted us to study the biodegradation of lindane using fungi. This study aims at enrichment, isolation and screening
of soil fungi capable of metabolizing lindane. Two Fusarium species (F. poae and F. solani) isolated from the pesticide contaminated soil showed better growth on the plates supplemented with lindane as a sole carbon
source, when compared with the growth performance of other fungal isolates from the same contaminated soil. However, ANOVA
revealed a significant difference in fungal biomass production in both F. poae (F = 22.02; N = 15; P < 0.001) and F. solani (F = 268.75; N = 15; P < 0.001) across different lindane concentrations (0–600 μg ml−1). Growth of both Fusarium sp. was maximum at a lindane concentration of 100 μg ml−1, while minimum at 600 μg ml−1 concentrations. Results on the time dependent release of chlorine by the Fusarium strains in the presence of various concentration of lindane showed the highest mineralization of the pesticide on 10th day
of incubation. Time dependent variations in the release of chlorine from 1st to 10th day by both the selected fungal strains
were found to be statistically significant. A significant positive relationship exists between fungal biomass increase and
chlorine release existed for both F. solani (R2 = 0.960) and F. poae (R2 = 0.628). The results of gas chromatograph analysis of γ- HCH confirmed the biodegradation and utilization of γ- HCH
by F. poae and F. solani. The data on lindane degradation by the two fungal strains demonstrated that the biodegradation of lindane by F. solani (59.4%) was slightly higher than that by the F. poae (56.7%). |
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