Purpose. To analyze genetic origin of new Myronivka varieties of bread winter wheat and to identify in their pedigree the carriers of germplasm of the varieties bred at Myronivka and samples of the world gene pool. Methods. The search work was carried out on the basis of primary sources (hybridization journals, main books of breeding material and catalogs of varieties) resulted in analysis of pedigrees of 14 bread winter wheat varieties bred at the V. M. Remeslo Myronivka Institute of Wheat of NAAS which have been put on the State Register of Plant Varieties of Ukraine during 2014–2018. Results. It was revealed significant diversity of initial forms (56 variety samples from 17 countries) which are traced in the pedigrees of new Myronivka wheat varieties. The largest number among them (18) are Ukrainian, 9 from Russia, 5 from Bulgaria, 4 varieties from Germany, Poland, and the Czech Republic, 3 from Italy and Hungary, 2 from Mexico and CIMMYT, 1 variety from Serbia, Yugoslavia, Tunisia, Colombia, France, Romania, and the USA. It was established that when creating 9 of 14 varieties studied (65 %), collection samples of various ecological and geographical origin were used in crossings both as the maternal component (in the varieties Berehynia myronivska, Balada myronivska, MІP Assol, MІP Dnіprianka, MІP Valensiia, MІP Kniazhna) and the paternal one (Horlytsia myronivska, Oberih Myronivskyi, Hospodynia myronivska). The most of new wheat varieties were created on the basis of germplasm of Myronivka varieties bred in previous years, such as Myronivska 808, Myronivska yuvileina, Myronivska 27, as well as promising lines (Erythrospermum 50713, 50137, 52334, Lutescens 52948, 30125). As for the varieties of foreign breeding, progenies of the Russian variety Bezostaya 1 are the most frequent. 93 % of new varieties have wheat-rye translocation (WRT) 1BL/1RS derived from the German varieties Hadmersleben 6508-74 and Weique. Conclusions. New bread winter wheat varieties are characterized with presence of wheat germplasm from Europe, America and Africa carrying by mainly Ukrainian varieties and their descents of previous years of breeding, which confirms the significant role of the local gene pool. The presence of WRT 1BL/1RS in genotypes of new varieties enhances their adaptive properties during crop formation period under stressful growing conditions.
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