Madhu BalaManpreet Singh2016-12-252016-12-252014http://krishikosh.egranth.ac.in/handle/1/92730The present investigation "Studies on induction of mutation in Chrysanthemum (Chrysanthemum morifolium Ramat.) through gamma irradiation" was carried out at Research Farm of Department of Floriculture and Landsacping, Punjab Agricultural University, during year 2012-2013. The rooted cuttings of two chrysanthemum varieties 'Gul-e-Sahir' and 'Bindiya' were treated with 0, 10, 20 and 30 Gy dose of gamma rays and planted in second week of August in Pots (20.32 cm). Evaluation was carried out for various vegetative and flowering characters. Maximum plant survival was recorded in untreated plants and reduction in plant survival increased with increasing doses of gamma irradiation. The maximum plant survival was 79.37% in 'Gul-e-Sahir' and 74.57% in 'Bindiya' at control i.e. 0 Gy dose. A reduction in number of branches and leaves per plant was recorded after gamma irradiation in both varieties at 30 Gy dose. The treatment with 30 Gy of gamma rays delayed the bud initiation as well as flowering in both varieties. Untreated plants of 'Gul-e-Sahir' and 'Bindiya' took 91.40 and 112.93 days to flower opening respectively. Flower size and number of ray florets also decreased with increased gamma irradiation. The leaf abnormalities were observed in terms of change in leaf shape, leaf size and floral abnormalities in terms of flower form which increased as the dose of gamma irradiation increased. In variety 'Gul-e-Sahir' four mutants were developed two at 10 Gy dose with green yellow colour and yellow colour with spoon shaped ray florets and other two at 20 Gy dose with yellow colour, flat and tubular ray florets. Three mutants were developed in variety 'Bindiya'. Two mutants were developed at 10 Gy with red colour, spoon and tubular ray florets. At 20 Gy one mutant was developed with red colour and irregular ray florets.ChrysanthemumChrysanthemum morifolium Ramat.)mutationGul-e-Sahirgamma raysBindiyairradiationFlowersThesis