Degradation of chlorpyrifos and BPMC by the bacteria isolated from contaminated shallot farm soil

Abstract

Accumulation of insecticide residues is harmful to the environment and human living. The research was conducted to explore the chlorpyriphos and BPMC degrading bacteria from contaminated shallot farm soils and to formulate bacterial consortium to be applied as the insecticides bioremediation agent. Among nineteen bacterial isolates, K10 and K14 bacterial isolates could degrade up to 38.3% and 43.3% chlorpyrifos contained in its growth medium in 5 days, respectively. Two bacterial isolates namely B21 dan B17 could degrade BPMC up to 75.9% dan 77% in 5 days of incubation. Bacterial consortium of K10+K14, K10+B21, and B17+B21 isolates could enhance in-vitro degration of chlorpyrifos up to 89.6%, 88.9%, and 88.1% respectively, while its BPMC degradation enhanced up to 75.9%, 70.3%, dan 69.5% respectively. The highest in-vitro degradation was showed by K10+K14 bacterial consortium. It could degrade up to 79.9% for chlorpyrifos, and 71.9% for BPMC. Base on the 16S rDNA sequence analysis, the isolates have similarity 97.7% to A. baumannii, 96.3% to B. toyonensis, 94.4% to uncultured enterobacter sp. clone 150, and 78.08% to uncultured bacterium clonenck09g01c1 for K10, K14, B17, and B21 bacterial isolates, respectively.