| Abstract: |
The present work was carried on Bougainvillea spp at the Experimental Farm of the Faculty of Agriculture, Zagazig University, at Zagazig, during the two successive seasons of 2005 and 2006. The aim of this investigation was to try to induce mutations in two cultivars of Bougainvillea, i.e, B. glabra white bracts (white flowering variety) and B. buttiana Mrs Butte (Red flowering variety). Physical (gamma ray 0.0, 2,0 4.0 and 6.0 Kr.) and chemical (N-nitroso-N-methyl urea NMU at 0.000, 0.010, 0.015, 0.020, 0.025%.) mutagens were used for this purpose.Results of physical (gamma –ray) and chemical (NMU) mutagens in first (M1) and second (M2) mutanted generations of Bougainvillea plants (var. white and var. red) will be presented below. It is known that, the effect of mutagens in M1- generation was mostly on the plant physiology, but M2 was the mutanted generation, in a sexual propagated plants.In a vegtatively propagated plants, assessing the mutations appeared in M2, and comparing the variation resulted from mutagens treatments and comparing the response of the plant type (var. white and var. red) is useful.1. Survival percentage:The survival percentage of rooted Bougainvillea cuttings were significantly reduced with the increase in gamma-rays and NMU doses, in M1 generation. It was highly significant with gamma –rays in white coloured one compared with the red one (significant). In M2 generation highly significant and significant reduction in survival percentage with gamma rays and NMU, respectively, and /also in both Bougainvillea type (var. red and var. white).When comparing the variations mean squares, it was in significant. That means no differences of the effect on survival of all the cases compared..
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