By: Nirmal Kumar J.l.*, Manmeet Kaur Amb, Rita N Kumar and Anubhuti Bora
Three strains of filamentous-heterocystous cyanobacteria such as Anabaena fertilissi,na,Aulosira fertilissima and Westiellopsis prolifica were screened for their photosynthetic pigments, stress metabolites and enzymatic activities in response t0 2,4-dichloro phenoxy
acetic acid ethyl ester and l-(4-chlorobenzyD-I-cyclopentyl-3-phenylurea (Pencycuron).
Amongst them, Westiellopsis prolifica grew maximally in BGii medium amended with both the pesticides concentrations. In 2,4-D ethyl ester treated cultures the phycobilin pigments showed superior plummet as compared to chlorophyll-a and carotenoids in all three
cyanobacterial species. Phycoerythrin showed highest reduction by 86% at 60 ppm in Anabaena fertilissi,na cells grown in medium amended with Pencycuron. After 4 days of inoculation slight raise in protein content at lower concentrations of 2,4-D was recorded in three species, whereas in Pencycuron treated cultures Anabaena fertilissi,na (10% at 60ppm) and Aulosira fertilissima (7% at 60ppm) showed minor lapse, and W. prolifica was unaffected in all treated concentrations. However, carbohydrates and amino acids have shown inhibitor effect on the three species of cyanobacteria in response of the increasing
concentration of both the pesticides, on the other hand, phenols exhibited the increasing trend. Activity of nitrate reductase, glutamine synthetase and succinate dehydrogenase were adversely affected in all three species when treated with the increasing concentrations of both the pesticides.
Three strains of filamentous-heterocystous cyanobacteria such as Anabaena fertilissi,na,Aulosira fertilissima and Westiellopsis prolifica were screened for their photosynthetic pigments, stress metabolites and enzymatic activities in response t0 2,4-dichloro phenoxy
acetic acid ethyl ester and l-(4-chlorobenzyD-I-cyclopentyl-3-phenylurea (Pencycuron).
Amongst them, Westiellopsis prolifica grew maximally in BGii medium amended with both the pesticides concentrations. In 2,4-D ethyl ester treated cultures the phycobilin pigments showed superior plummet as compared to chlorophyll-a and carotenoids in all three
cyanobacterial species. Phycoerythrin showed highest reduction by 86% at 60 ppm in Anabaena fertilissi,na cells grown in medium amended with Pencycuron. After 4 days of inoculation slight raise in protein content at lower concentrations of 2,4-D was recorded in three species, whereas in Pencycuron treated cultures Anabaena fertilissi,na (10% at 60ppm) and Aulosira fertilissima (7% at 60ppm) showed minor lapse, and W. prolifica was unaffected in all treated concentrations. However, carbohydrates and amino acids have shown inhibitor effect on the three species of cyanobacteria in response of the increasing
concentration of both the pesticides, on the other hand, phenols exhibited the increasing trend. Activity of nitrate reductase, glutamine synthetase and succinate dehydrogenase were adversely affected in all three species when treated with the increasing concentrations of both the pesticides.
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