Volume 10 Number 1 (Jan. 2019)

Bioscience Discovery, 10(1):36-42, Jan. - 2019

A study on toxicity of organophosphorous pesticides on cynobacterium Westiellopsis prolifica Janet

Vijayakanth P.1*, V. Ravi V.2 and O. Sivapriya O.3

1*Department of Botany, Arignar Anna College (Arts & Science), Krishnagiri-635 115, Tamil Nadu
2Department of Botany, Govt., Arts College for Men, Krishnagiri-635001, Tamil Nadu
3Department of Microbiology, Govt., Arts College for Men, Krishnagiri-635001, Tamil Nadu
*Email: apvijayakanth@gmail.com

Article info
Received: 26-10-2018,
Revised: 01-12-2018,
Accepted: 12-12-2018

Abstract
Effect of two widely used organophosphate pesticide such as Triazophos and Monocrotophos on the growth, biochemical metabolites like protein, carbohydrate, photosynthetic pigment chlorophyll a and accessory photosynthetic pigment phycobillin contents and stress induced non protein amino acid proline content in strain of freshwater cyanobacrteium Westiellopsis prolifica Janet was studied. The various concentrations of Triazophos and Monocrotophos were exposed to W. prolifica the inhibitory concentration (EC 50) was determined. The EC50 value of Triazophos and Monocrotophos were 125 µm and 350 µm respectively for W. prolifica. Both the organophosphate insecticides used in the study reduced the protein content of W. prolifica. It was interesting to note that organophosphate insecticides inhibit the synthesis of photosynthetic pigments too in the cyanobacteria which was reduced with 51% (Triazophos) and 48% (Monocrotophos) at respective EC50 concentration. The organophosphate pesticide changes the ratio and production of Phycobilin content in W. prolifica. The pesticide Triazophos and Monocrotophos inhibited Phycocyanin content 65% and 34%, Allophycocyanin 61 % and 43% Phycoerytherin 45% and 39% respectively. Phycocyanin and Allophycocyanin content of W. prolific was severely inhibited by pesticide Triazophos, whereas reduction was comparatively less by Monocrotophos. There was no signification variation noticed in Phycoerytherin content in both stresses imposed in W. prolifica similar response was noticed in production of carbohydrate content in Triazophos treated W. prolifica the reduction was 73%. The enhanced level Proline synthesis was noted in Triazophos treated W. prolifica it has 16 fold increase whereas as only 3 fold increase in Monocrotophos treated culture at respective EC 50 value. Thus reduction in all the biochemical parameters and increased level of proline revealed that Triazophos was more toxic to W. prolifica than Monocrotophos.

Keywords
Cyanobacteria, EC 50, Monocrotophos, photosynthetic pigment, proline, Triazophos, Westiellopsis prolifica.

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How to cite this article
Vijayakanth P., V. Ravi V. and O. Sivapriya O., 2019. A study on toxicity of organophosphorous pesticides on cynobacterium Westiellopsis prolifica Janet. Bioscience Discovery, 10(1):36-42.

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