Inheritance of spike productivity elements in F1 winter bread wheat hybrids

Purpose and Objectives. Our purpose was to study the inheritance of spike productivity elements by F1 hybrids from tester crosses winter bread wheat varieties different geographical origins.
 Materials Methods. Twenty hybrid combinations were studied. Field studies conducted in 2017–2019. The experiments laid out accordance with requirements breeding field experiments. their parents sown a hand planter within optimal timeframe. row length 1 meter; distance between rows 20 cm; depth 4–6 predecessor black fallow. kernels per sown. Data statistically processed, as B.A. Dospekhov recommended. phenotypic dominance degree for traits calculated B. Griffing’s formula. obtained data grouped G.M. Beil. R.E. Atkins’s classification.
 Results Discussion. In 2018, 50% hybrids, ‘spike length’ trait inherited overdominance; 2019 2020, this type prevailed, accounting 95% 70%, respectively. Positive train 2018 observed five (25%). one combination (5%) two (10%), Intermediate four (20%) three (15%) 2020. Negative recorded Vodohrai Bilotserkivskyi / Arktis (hct = -0.9) Korovaina Kanada -0.8) 2020.
 ‘spikelet number spike’ overdominance 85% combinations; 2019, 100% combinations. combinations, namely 1.0) 0.7), positive dominance, Ladyzhynka 0.1) - intermediate inheritance. (Vodohrai Viglanka 0.8)); negative (Ladyzhynka Donera -1.0)) – (Korovaina -0.3)).
 ‘kernel 55% 20% (4 combinations) 10% (2) 0.8). (10%) 0.4) seven not any years.
 “kernel weight 75%, 0.9) 0.8); 0.3), 0.5), Khvala ). (Khvala =1.0)).
 ‘thousand kernel weight’ similarly 2020: prevailing 70% (14 combinations). 15% (3 also (3) overdominance, 75% (15 combinations); (2 Dyvo 0.8) ( hcт 0.6)) 0.4)). addition, that year, -1.1) (depression) < -1).
 Conclusions. Across years, all studied traits, specifically (50%, respectively), spikelet (85% 2020 2019), (70% 2020), (75% 2020) thousand 2019). On average across investigated identified: Viglanka. showed highest combining ability.