title: Chlorpyrifos-induced changes in the antioxidants and fatty acid compositions of Chroococcus turgidus NTMS12.
abstract: This study investigated the effect of pesticide chlorpyrifos (CP) on a freshwater cyanobacterium Chroococcus turgidus NTMS12. The changes in chlorophyll-a, proline, superoxide dismutase (SOD), catalase (CAT) activities and fatty acid composition of the test organism were analysed. Organism was grown at 6, 9 and 12 mg l(-1) of CP, and based on the chlorophyll-a content, 6 mg l(-1) of CP was found to be the tolerable concentration. Hence, 6 mg l(-1) of CP was taken to evaluate the concentration of proline and activities of SOD and CAT at 48-h exposure. The changes in the fatty acid profile were analysed after 7 days of exposure. Upon pesticide exposure, increased concentration of proline and activities of SOD and CAT were found. Significant changes in fatty acid profile have also been observed. However, polyunsaturated fatty acid content was decreased in treated cultures when compared with the untreated control. Changes in biochemical activities indicate that cyanobacteria C. turgidus NTMS12 undergo adaptive changes against CP-induced oxidative stress.
  
  
  CONCLUSIONS
  : Chlorpyrifos induces oxidative stress in Chroococcus turgidus NTMS12. A strong inference was made on increased activity of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT) and proline content and lowering the level of unsaturated fatty acids under the pesticide-exposed condition. These significant changes are the defence mechanisms against the oxidative stress. Thus, this organism holds great promise in resisting toxic pesticide.
authors: Division of Microbial Biodiversity and Bioenergy, Department of Microbiology, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India; Department of Natural Resources and Environmental Engineering, Hanyang University, Seoul, South Korea.
authors: M S
authors: MS
authors: Kumar
authors: R
authors: R
authors: Praveenkumar
authors: B-H
authors: BH
authors: Jeon
authors: N
authors: N
authors: Thajuddin
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D004390:Chlorpyrifos / Q000633:toxicity*; D000458:Cyanobacteria / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism*; D005618:Fresh Water / Q000382:microbiology; D007306:Insecticides / Q000633:toxicity*; D018384:Oxidative Stress; D011392:Proline / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D005227:Fatty Acids; D007306:Insecticides; D002734:Chlorophyll; D011392:Proline; D002374:Catalase; D013482:Superoxide Dismutase; D004390:Chlorpyrifos; D000077194:Chlorophyll A
keywords: Chroococcus turgidus; catalase; chlorpyrifos; gas chromatography; proline; superoxide dismutase