Potential Impact of Cypermethrin on Selected Groups of Soil Microorganisms
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Date
2017-06-01
Journal Title
Journal ISSN
Volume Title
Publisher
Egyptian Academic Journal of Biological Sciences
Abstract
Application of cypermethrin as insecticide during agricultural practices
is a global concern due to its toxicity and potential accumulation of its
metabolites in the aquatic environment. A mesocosm plot of agricultural land
(500 m2) was demarcated and deliberately contaminated with cypermethrin to
study its impact on the autochthonous microorganisms. Potential effects of 3-
phenoxybenzoic acid (3-PBA), a known suicide metabolite of cypermethrin,
on hydrolytic activities were also investigated by using fluorescein diacetate
assay (FDA). A significant increase in the abundance of total heterotrophic
bacteria from 3.55 x 106cfu g-1to 1.30 x 108cfu g-1in 12 weeks as against the
control was induced by the insecticide in the mesocosm. The number of
starch hydrolysing bacteria increased after the second insecticide treatment
from 6.25 x 106cfu g-1to 2.70 x 107 cfu g-1in three weeks. However, there was
no significant increase in the microbial count of fungi, presumptive
actinomycetes and nitrogen fixing bacteria during the twelve weeks of
experiment. The hydrolytic activity of soil microorganisms was apparently
inhibited insoil treated with different concentration of 3-PBAthan in untreated
soil. These results suggest that the application of a commercial cypermethrin
formulation increased the abundance of selected soil microorganisms while3-
PBA reduced the soil microbial hydrolytic activity.
Description
Keywords
Cypermethrin;, Microbial Abundance;, Soil;, 3-Phenoxybenzoic acid
Citation
Anozie Patience C.; Ilori Matthew O; Amund Olukayode O; Schmidt Stefan (2017).Potential Impact of Cypermethrin on Selected Groups of Soil Microorganisms. Egyptian Academic Journal of Biological Sciences, G. Microbiology, 9(1), 39-50. doi: 10.21608/eajbsg.2017.16342