Enhancement of lipase production by ethyl methane sulfonate mutagenesis of soil fungal isolate
DOI:
https://doi.org/10.14719/pst.2019.6.sp1.674Keywords:
Ethyl methane sulfonate, fermentation processes, spores, Submerged fermentation, Solid State Fermentation, mutagenesisAbstract
Strain improvement through random mutagenesis is an extremely developed practice and it plays an important role in the economic growth of microbial agitation processes. The present study comprises of genetic improvement of fungus isolated from petrol pump soil by ethyl methane sulfonate (EMS) mutagenesis for increased production of extracellular lipase. Random mutagenesis was performed by incubating the spore suspension of fungus with EMS at a concentration of 5% (v/v) and 8% (v/v) for 30, 60 and 90 min, respectively. Control set was prepared by incubating the spore suspension with sterile distilled water. Control plate showed maximum number of fungal colonies whereas number of colonies was decreased as we increased exposure time of EMS from 30 to 90 min. The lipase activity of six mutagenic strains and wild strain was determined under submerged fermentation and solid state fermentation. Treated culture named as EMS5%-60min (obtained after 60 min exposure with 5% EMS) exhibited maximum activity (32.09 ± 1.84 IU/ml/min) in SmF as compared to wild strain (8.77 ± 3.52 IU/ml/min) and another treated strain named as EMS8%-90min (obtained after 90 min exposure with 8% EMS) exhibited maximum activity (7.99 ± 0.12 IU/g/min) in SSF as compared to wild strain (1.77 ± 0.71 IU/g/min). The activity of mutagenic strain i.e. EMS5%-60min was increased to 365.90% as compared to 100% activity of wild strain in SmF whereas activity of another mutagenic strain i.e. EMS8%-90min was increased to 451.41% as compared to 100% activity of wild strain in SSF.
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