Abstract
This study deals with the comparative responses of the two cyanobacteria viz. Nostoc muscorum and Phormidium foveolarum against single and combined doses of low (UV-BL, 0.1μmolm−2s−1) and high (UV-BH, 1.0μmolm−2s−1) fluence rates of ultraviolet-B radiation with low (CPL, 1μgml−1) and high (CPH, 2μgml−1) doses of the insecticide chlorpyrifos by measuring changes in growth, ascorbate-glutathione cycle enzymes and related metabolites. CPL and UV-BL both caused lesser increase in ROS but significantly stimulated AsA-GSH cycle enzymes. On the other hand, CPH and UV-BH posed inhibitory effects by enhancing ROS and inhibiting AsA-GSH cycle enzymes. Inhibitions in CPH or UV-BH treated samples were significantly prevented when they were supplemented with UV-BL and CPL (after 72h), respectively by lowering down ROS and enhancing AsA-GSH enzymes and related metabolites which manifested in terms of improved biomass accumulation.
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