天竺葵嵌合型外植体培养中的二倍体选择现象

ifferent explants from the cytochimeral clone `Weißer Liebling` with diploid-haploid -haploid and clone `Kleiner Liebling` 5/74/2 with polyploid-haploid-haploid of Pelargonium zonale were used first time to investigate regenerated ability of different ploidy cells In vitro on the same medium in the same conditions. Regenerated plants contained diploids, tetraploids and mixoploidy. 44.5% from clone `Weißer Liebling` and 68.0% of regenerates from explants of clone `Kleiner Liebling` 5/74/2 were plants with diploid chromosome number. The results showed that diploids had an advantage by competition between the different ploidy cells during shoot development, i.e. diploid Selection Phenomena. Diploid shoots were possibly produced not only from the double of the haploid origin, but also from the somatic reduction of the polyploid origin