Abstract:The present experiment was undertaken to determine the mutagenic effectiveness and efficiency of gamma rays on different biological parameters in snake gourd. The research was conducted in two generations namely M 1 and M 2 during spring-summer season (mid-February) of 2012 and 2013 at the Horticulture research station, Mondoury, Bidhan Chandra Krishi Viswavidyalaya. The parent material, selfed seeds of BCSG-28 variety were irradiated with 100 Gy, 150 Gy, 200 Gy, 250 Gy and 300 Gy doses of gamma rays. The seeds along with control were space planted for raising M 1 generation. Each M 1 plant was harvested separately and desirable M 1 individual plant progeny rows were laid in RBD for raising M 2 generation. The effectiveness and efficiency of the mutagen used was assessed from the data on biological damage in M 1 generation. In M 1 generation, results showed a dose dependent retardation in biological parameters like seed germination, plant survival and 200 Gy was depicted as LD 50 indicating less damaging effect at lower doses on genetic material. In M 2 generation, Lower doses 100 Gy (28.80 effectiveness, 21.58 efficiency) and 150 Gy (18.33 effectiveness, 8.68 efficiency) treatments were found as effective and efficient and a wide range of induced variability was observed in almost all traits. The mutants with short fruit, higher fruit diameter and reduced vine length were isolated in M 2 generation.
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