Vol. 11 No. 1
Effect of different doses of gamma rays on survivability and rooting ability in chrysanthemum (Chrysanthemum morifolium Ramat.)
Abstract: Mutation breeding plays a major role to create genetic variation in crop plants. Chrysanthemum is one among them where it has been exploited many a times to generate variation. Generally rooted cuttings are used for irradiation treatment. The present study was aimed to know the response of unrooted cuttings to gamma radiation. Stock plants of three varieties BC-8-05, Winter Queen and Bidhan Shova of Chrysanthemum were subjected to different levels of gamma irradiation 0, 10, 15, 20, 25 and 30 Grays to study the rooting potential. Number of roots, as well as root length increased significantly in several cases at 10 Grays in comparison to control. But further increase in dose reduced the length and also resulted in poor morphological appearance. Increase in radiation doses also resulted in delayed root initiation period and survival percentage. Pronounced intervarietal difference in respect of LD50 values was found and it was higher in case of unrooted cuttings as compared to the rooted cuttings. Unrooted cuttings of Winter Queen recorded highest LD50 (20.1 Grays), whereas it was found to be lowest in case of rooted cuttings of Bidhan Shova (10.2 Grays).
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