The response of a unicellular cyanobacterium Gloeocapsa to 2,4-D (2, 4 dichlorophenoxy acetic acid) and methylparathion was studied. 2,4-D inhibited growth when introduced at 175 and 200 ppm concentrations, whereas 100, 125 and 150 ppm concentrations had no pronounced effect. Nitrogenase activity was inhibited in the presence of 175 and 200 ppm 2,4-D. Meanwhile, methylparathion was found to be comparatively less toxic to Gloeocapsa, while 1 ppm methylparathion was a mere growth stimulator; 5, 10, 50 and 100 ppm concentrations had no significant effect on growth. However, 10, 50 and 100 ppm methylparathion inhibited nitrogenase activity considerably.
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