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- Title
Biodegradation of chlorpyrifos and 3, 5, 6-trichloro-2-pyridinol by a novel rhizobial strain Mesorhizobium sp. HN3.
- Authors
Jabeen, Hina; Iqbal, Samina; Anwar, Samina
- Abstract
A chlorpyrifos (CP) and 3,5,6-trichloro-2-pyridinol (TCP) degrading bacterial strain, Mesorhizobium sp. HN3, was isolated and characterized. Mesorhizobium sp. HN3 degraded CP efficiently up to 400 mg/L initial concentration at wide range of temperatures (30-40°C) and pH (6.0-8.0). However, optimal degradation of CP was achieved at 37°C and neutral pH (7.0) at an initial inoculum density 2 × 107 colony forming unit/mL of culture medium. Kinetic parameters for CP degradation by Mesorhizobium sp. HN3 were estimated at different initial concentrations. Cultures exhibited significant variation (P ⩽ 0.05) in the specific growth rate (μ), cell mass formation rate (QX) and the substrate uptake rate (QS) during degradation of CP. The values of kinetic parameters increased up to 100 mg/L CP and decreased at higher concentration. Investigation of degradation metabolites indicated that CP is converted to diethylthiophosphate and TCP that leads to the formation of 3,5,6-trichloro-2-methoxypyridine.
- Subjects
PHYSIOLOGICAL effects of chlorpyrifos; BIODEGRADATION; ENVIRONMENTAL degradation; METABOLITES; ACARICIDES
- Publication
Water & Environment Journal, 2015, Vol 29, Issue 1, p151
- ISSN
1747-6585
- Publication type
Article
- DOI
10.1111/wej.12081