Vlasyuk M. Genetic futures of pollinators and their influence on the formation of heterosis in sugar beet hybrids

Complex studies on breeding - genetic value of pollinators of Verkhnyachka, Lgov, Ivanovka and Veselopodil geneplasma of different levels of homo - and heterozygosis were carried out. The degree of the negative influence of inbreeding on reproductive sphere and productivity of pollinators was determined. The efficiency of selections on the basis of the given genetic material for pollen forming ability, morphophysiological indexes of pollen and germination was proved. The correlative relations between properties and limits of inbreeding depression of agronomic characters were determined. In the thesis, on the basis of application of regression analysis, the the adiquancy of the use of an additive - dominant model for evaluation of genetic value of pollinators was established. The component of genotypic variation of agronomic characters of MS hybrids? Developed on the background of the two pollen sterile lines of domestic and foreign origins, were studied with the aim of selecting methods of their genetic perfection. Differentiation of 26 pollinators with divergently remote geneplasma of different genetic structure for their effects of general and specific combining ability was carried out and the best of them were identified, on their basis, hybrid combinations with genetically called forth heterosis were developed. Two pollinators were transferred to the national centre of genetic resources of plants of Ukraine. The pollinators VP 16 and VP 135 were studied in the ecological variety testing of the "Betaintercross" system. With their participation, two hybrids were created with a guaranteed increase for sugar yield which were given to the state variety testing in 2006.