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Creation and selection of parental components in selection of single-sprout fodder beet hybrids on a sterile basis

The aim of the research was to create combinationcapable parental components and establishing criteria for their selection of single-sprout fodder beet hybrids on a sterile basis. It was determined that to obtain highly productive single-sprout fodder beet hybrids on a sterile basis, the crossing components should be characterized, in addition to high hybridization potential, increased basic productivity in accordance with their genetic structure and inheritance features of controlled traits. The root crop yield of singlesprout CМS lines should be within 90–95 %, the dry matter content should be 100–105 % of the best multi-germination standard fodder beet varieties. The level of pollen sterility of CМS lines plants should be 95–99 %, and seeds monogermity of should be 97– 100 %. Multi-germination pollinators of fodder beets should exceed the standard variety in terms of root crop yield by 5–10 % and be on a par with it in terms of dry matter content. The most highly productive experimental single-sprout fodder beet hybrids KBO 231/8, KBO 218/4, KBO 220/7, KBO 261/5, KBO 215/9 were created using the lines BK CМS 39/17, BK CМS 27/14, BK CМS 17/22 and multi-germination pollinators BKZ-133/8, BKZ-156/9, BKZ-141/46. These hybrids exceeded the standard in root crop yield by 3.4–5.1 %, dry matter content and yield by 1.4–4.2 % and 5.0–9.1 %, respectively. They are suitable for cultivation using intensive technologies without manual labor. According to the results of variety testing, five combinable O-type lines and their CМS analogues and six combinable multi-germination pollinators of fodder beets with an increased level of basic productivity were identified. Criteria for selecting parental components were established based on a complex of breeding, genetic and economically valuable traits, five highly productive single-sprout fodder beet hybrids on a sterile basis were created, which exceed the multi-sprout standard in terms of dry matter yield by 5–10 %.

Key words: fodder beet, source material, inbreeding, heterosis, hybrid, productivity, dry matter content.

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