Nenka O. Comprehensive assessment of sugar beet pollinators bred in Uman to create genetic sources of valuable agronomic traits

The thesis focuses to revealing patterns of inheritance and variability of productivity component signs as well as seeds sowing qualities components in interline diallel and topcross hybrids of sugar beet created with pollinators of Uman geneplasm, resulting in creating improved genetic resources of agronomic traits and prospective CMS sugar beet hybrids. Established are the genetic parameters of valuable agronomic traits, such as yield, sugar content, sugar yield, germination vigour and weight of 1000 seeds. Based on the Hayman model, defined were level and direction of dominance, established relative share of dominant and recessive genes controlling a sign in male and female parent lines, inheritance indexes, the number of genes or groups of genes. The structure of genotypic variability of agronomic traits was determined as well as its components share of influence in forming genotype of the hybrids obtained as a result of diallel and top crosses. Two genetic sources of high productivity were created and brought to breeding stations to create new lines of recombinant sugar beet pollinators. Based on the hybridization of female forms of different genetic structure (CMS lines, simple sterile hybrids) and genetic-valuable lines BP 1 and BP 2 created and selected were prospective CMS sugar beet hybrids, whose productivity makes up 112.5 to 116.3% to group standard.