Abstract
SUMMARYThe effects of NTG, a potent mutagen, were studied on the nuclear cytology of Spirogyra paradoxa Rao. Five different concentrations 10, 20, 50, 100 and 200 μg/ml were applied for 2 and 4 hr. 200 μg/ml for 24 hr and 100 μg/ml for 48 hr were found to be lethal and sublethal doses respectively to the alga. The various nuclear and chromosomal aberrations as a result of treatment with different concentrations were assessed both qualitatively and quantitatively. Anaphase bridges, laggards, micronuclei, chromosomal/chromatid breaks and chromatid exchanges are reported for the first time in algae as a result of the treatment with NTG.
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