RESISTANCE BREEDING OF APRICOTS AT THE HORTICULTURAL FACULTY IN LEDNICE

During the breeding process of apricots in the Horticultural Faculty in Lednice we searched for donors against sharka disease (Plum pox virus - PPV). As donors of resistance to PPV for crossing was the choice of cultivars as ‘Stark Early’, ‘Orange’, ‘Orangered, Harlayne’, ‘Henderson’, ‘Goldrich’, ‘Orangered’, ‘Harlayne’, ‘Mari de Cenad’ and ‘Alfred’. From crossing of this combinations we obtained results indicating to a polygenic character, when in case of the SEO resistance donor the segregation ratio 3:1 was susceptible/resistant. Back crossing the progenies with this donor we obtained either the same ratio or 5:3. The progeny with immune cultivar ‘Harlayne’ had the ratio of 7:1.