Journal
CHEMOSPHERE
Volume 247, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.125948
Keywords
Biodegradation; Chlorpyrifos; Pesticide; Plant growth promoting activity; HPLC
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Funding
- National Research Foundation of Korea (NRF) from the Korean government (MSIP, South Korea) [2018R1D1A1B07050040]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government (MOTIE) [20194110100100]
- King Saud University [RGP-1438-029]
- National Research Foundation of Korea [2018R1D1A1B07050040] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The present study explores the rapid chlopyrifos (CPs) biodegradation potential of plant growth promoting (PGP) psychrophilic bacteria isolated from brackish water by enrichment culture technique. Based on biochemical tests and 16 S rDNA sequencing the isolate was identified as Shewanella sp. The isolate Shewanella BT05 showed significant growth rate in various concentrations of (10-50 mg/L) CPs. The isolate produced plant growth promoting factors, IAA (20.8 +/- 1.2 and 15.4 +/- 1.0 ug/mL) and siderophores (60.67 +/- 1.2 and 57.5 +/- 0.9%) in the absence and presence of CPs. Further, the isolate BT05 solublized phosphate (16.5 +/- 1.0 and 12.0 +/- 1.0 mm in size respectively), and produce hydrogen cyanide (excellent and moderate) in the presence and absence of CPs. The isolate BT05 degraded 94.3, 91.8, 87.9, 82.6, and 80.5% of CPs at 10, 20, 30, 40, and 50 mg/L, respectively, within 24 h. Further, the media conditions were optimized for enhanced CPs removal and observed 93% removal in the presence of 3.5% glucose in pH 7.0 at 32.5 degrees C. Fourier-transform infrared spectroscopy and high-performance liquid chromatography results indicated the role for Shewanella BT05 in the biomineralization of CPs. The results suggested the isolate BT05 could be used for CPs removal as well as PGP activity in contaminated soil. (C) 2020 Elsevier Ltd. All rights reserved.
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