Abstract
Bud-wood from seven rose cultivars exhibiting five different colors were exposed to 0, 3, 4, and 5 krad of gamma rays. A similar response was observed for all exposed cultivars; it included dose response reductions in bud-take, number and height of shoots, survival, flowers, petal weight and pollen fertility.The LD 50 for white and mauve-flowered cultivars was found to be lower than the yellow, red andpink-flowered ones; the latter were more prone to mutations. Many phenotypically detectable variations in leaf, flower and growth habit were recorded in irradiated populations. Only three mutations, one in growth habit and two in flower colors, were successfully isolated and propagated. The results suggest that the Floribunda rose, i.e., Pink Parfait was more suitable for induction of mutations as compared with the six Hybrid Teas.
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