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Fungal degradation of an acetolactate synthase (ALS) inhibitor pyrazosulfuron-ethyl in soil

Author:
Sondhia, Shobha, Waseem, Uzma, Varma, R.K.
Source:
Chemosphere 2013 v.93 pp. 2140-2147
ISSN:
0045-6535
Subject:
Aspergillus niger, Penicillium chrysogenum, acetolactate synthase, agricultural soils, biodegradation, chemical degradation, crops, enzyme inhibitors, metabolites, phytotoxicity, pyrazoles, soil fungi, sulfonylurea herbicides
Abstract:
Owing to reported phytotoxicity of some sulfonylurea class of herbicides in number of sensitive crops and higher persistence in soil, present study was conducted to isolate and identify pyrazosulfuron-ethyl degrading fungi from soil of rice field. Penicillium chrysogenum and Aspergillus niger, were isolated and identified from rhizospere soil of rice field, as potent pyrazosulfuron-ethyl degrading fungi. Degradation of pyrazosulfuron-ethyl by P. chrysogenum and A. niger, yielded transformation products/metabolites which were identified and characterized by LC/MS/MS. The rate of dissipation of pyrazosulfuron-ethyl was found higher in soil of rice field and soil inoculated with P. chrysogenum. This showed important route of degradation of pyrazosulfuron-ethyl by microbes apart from chemical degradation.
Agid:
1122518