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Combining ability, inheritance and transgressive segregation of spring barley hybrids by grain weight per plant
Results of systemic estimation of topcross of spring barley hybrids in contrasting weather years are given. The degree of phenotypic dominance, the level of true heterosis, degree and frequency of transgression by grain weight per plant have been determined. General and specific combining ability by grain weight per plant of spring barley accessions previously selected from the gene pool for economically valuable traits: Kaya (TUR); Ria, Hanka, Ditta, Madeira, Barke, Scarlett (DEU); Dominique (NDL); Sebastian (DNK); Sylvianna (FRA) has been determined. Sources of high general combining ability by grain weight per plant – Barke, Sebastian, Sontsedar, Obolon have been identified. The efficiency of hybridization of Western European spring barley accessions with domestic varieties to create breeding material with increased level of recombination of traits and positive transgressions has been proved. By means of hybridization new hybrid combinations with high degree and frequency of transgressions – Barke / Sontsedar, Sebastian / Yukatan, Hanka / Obolon, Sebastian / Sontsedar, Ria / Obolon, Scarlett / Sontsedar have been developed.
Key words: spring barley, grain weight per plant, combining ability, degree of phenotypic dominance, heterosis, transgression.
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