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  • Author or Editor: Herbert H. Grossman x
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Abstract

M2 progenies from geranium (Pelargorium X hortorum L.H. Bailey), which had been irradiated with 1, 2, and 3 krads of acute gamma radiation, were evaluated for stem and branch length and number of leaves and branches. After several weeks, the progenies from plants irradiated with 2 and 3 krads were significantly shorter than the controls. Progenies treated with 3 krads were 21% shorter and exhibited a 30% reduction in branch length compared to the controls at the termination of the experiment. These effects were similar to those observed in the M1 generation. Leaf and branch number did not differ significantly among progenies of the irradiated plants. It is suggested that gamma radiation induced changes in endogenous levels of GA in the M1 plants, and these changes were transmitted to the M2 progenies.

Open Access

Abstract

Seeds of Pelargonium × hortorum cv. ‘Carefree Deep Salmon’ were given 1, 2, or 3 krad of acute gamma radiation to determine the influence on germination, plant morphology and growth. Percent germination was stimulated by 1 krad and inhibited by 3 krad compared to the control. Plant height and branch length were initially greater for irradiated plants, but the controls eventually grew significantly taller and had greater branch length than plants irradiated with 2 and 3 krads. The growth differential appeared to reflect differences in internode elongation and it is suggested that gamma irradiation may have altered the gibberellin status of the plants. Similar effects were noted for leaf and branch number; however, only the 3 krad dose caused a significant reduction in these parameters.

Open Access