Somatic Mutagenesis of Gerbera Jamesonii Hybr.: Irradiation and in Vitro Culture

Induced Mutations in Ornamental Plants

“…The proportion of mutants with uniformly altered inflorescences increased considerably in the second vegetative generation, regenerated again from leaf explants. Not surprisingly, the number of chimaeras was high even after two cycles of micropropagation, when plants were regenerated from axillary buds after irradiation of in-vitra shoots (Laneri et al, 1990). Among 1250 MV 2 plants, 187 mutants were found, of which only six were assumed to be solid.…”

“…After X-ray treatment of in-vitra shoots, in addition to mutants of this marker, a considerable variation in flower colour was obtained ranging from red to different shades of violet-pink up to cream. Laneri et al (1990) found six different flower colour mutants and 13 types of variations affecting flower morphology following irradiation of in-vitra shoots of a pink cultivar. Although, there have been considerable efforts to optimize methods for in-vitra mutagenesis in Gerbera, e.g.…”

“…After repeated selfing of selected mutants, three stable lines showing spray-type inftorescences with small ftowers of funnel-or bell-shaped form, respectively, were selected and submitted for registration as new cultivars (Nagatomi et ai., 1996). Datta, 1991a;Jerzy, 1990;Ahloowalia, 1992 B&vH; Simard et al , 1992;Cassels et al, 1993Nagatomi et al, 1996Walther and Sauer, 1986aLaneri et al, 1990Lysikov, 1990 B&vH; Banerji and Datta, 1986B&vH Schwaiger, 1992B&vH Mahna and Garg, 1989 B&vH; Datta, 1991a B&vH B&vH;Wa1tber and Sauer, 1986b;Datta, 1989Shukla et al, 1986B&vH B&vH Venkatachalam and Jayabalan, 1994b Induced alterations in flower shape were mentioned, but unspecified, for the following species: Canna, Muscari, Omithogalum, (B&vH) and Antirrhinum (MBNL,t 1992).…”

Effects of Gamma Irradiation on Shoot, Root and Survival Percent in Strawberry cv. Chandler under In vitro Conditions

“…In the present studies, the positive response of strawberry to low dose (5 Gy) of gamma irradiation agrees with the hypothesis proposed by Fowler and McQueen (1972), that the stimulatory effects of low doses of irradiation result in increased seedling vigour. Stimulation of growth with lower doses of gamma rays has been reported in various crops, such as Rudbeckia laciniata (Shukla et al, 1986), Gerbera Jamesonii (Laneri et al, 1990). Enhancement in multiplication ratio at low doses (15 Gy) of Musa species have also been reported by Kulkarni et al, (1997).…”

Induced mutations in cassava using somatic embryos and the identification of mutant plants with altered starch yield and composition

“…The results of mutation breeding experiments in Gerbera jamesonii suggested that the chosen dose should result in the highest survival of the irradiated explants as well as a low inhibition of the rate of production of new shoots (Laneri et al 1990). This ensures the highest efficiency in recovering useful mutants.…”