Huba I. Features of creation of multi-flowered sourse material in breeding of winter rye

The dissertation presents a theoretical generalization and a new solution of the scientific problem, which is to study the peculiarities of creating a multiflowered source material of winter rye for the manifestation of multi-flowered and its impact on fruit formation and productivity of winter rye in the northern ForestSteppe of Ukraine. As a result of studying the varieties of winter rye for the shape of spike were identified the valuable sources of multi-flowerness. (var. compositum Lam., var. monstrosum Koern.), collection samples of winter rye in the shape of in spike and the efficiency of using multi-flowered varieties as parent components to create a multi-flowered source material was determined. Eight collection samples of winter rye, which had third flowers with grains – № 147-13, Stoir, Iryna, Velyten, Vitvitske, Siverske, Intensyvne 95, Intensyvne 99. The five collection samples – № 14-14, № 15-14, № 16-14, № 17-14, № 25-14, which were four-flowered, because they formed the fourth additional flowers in the spikelets and formed a mass of grains from them. In addition, breeding numbers such as № 15-14 and № 16-14 had a high genetic potential for grain formation from the fifth additional flowers in spikelets. Siverske variety, breeding numbers – № 15-14, № 17-14 and multi-flowered var. composirum Lam. provided of increase the number of flowers formed in the spike and grain productivity in plants of hybrid populations of winter rye. It is advisable to make hybridization with multi-flowered numbers of winter rye to increase the number of flowers formed in the spike, followed by breeding for optimal tying of grains in the spike, which potentially leads to an increase in the percentage of winter rye seed formation. To expand the genetic diversity of multi-flowered forms as a source material, have created F1 and F2 generations with increased indicators of the number of flowers formed in the spike: Pamiat’ Khudoierka / № 17-14, Siverske / № 17-14, № 17-14 / № 15-14 and № 17-14 / 155-10, characterized by optimal grain productivity. Key words: winter rye, multi-flowered source material, spike, number of flowers, variety, collection sample, hybrid combination, var. compositum Lam., var. monstrosum Koern., crossbreeding, seed formation, grain percentage, grain productivity, plant breeding