Muzafarova V. Breeding value of winter bread wheat varieties for resistance to leaf mycotic spots and its inheritance

Object: selected-genetical peculiarities in winter bread wheat resistance to leaf spots' pathogens, the search for the sources of resistance and economic traits, the elucidation of the composition of local populations of leaf spots' pathogens, the estimation of breeding value of winter bread wheat varieties by the resistance to mycosic leaf spots and its inheritance. Aim: the estimation of breeding value of winter bread wheat varieties by the resistance to leaf spots pathogens and creation of the initial material with the resistance to mycosic leaf spots for this crop's breeding in the conditions of the eastern part of the Forest-Steppe of Ukraine. Methods: field, laboratory, statistic. Novelty: breeding value of winter bread wheat varieties for a complex of agronomic traits, immunologic characteristics and their correlation and combining ability has been determined; on its basis in complex the valuable specimens of winter bread wheat with high productivity and resistance to the pathogenes of mycosic leaf spots which combine high phenotypic effects with ecological plasticity, have been chozen. A specific composition of the local populations of leaf spot pathogenes by means of the samples of the world collection and current varieties has been determined, a dominant species has been proved, its share in the population of spots' pathogenes has been evaluated. The peculiarities in inheritance have been determined as well as the correlation and heritability of the trait for resistance to leaf spot pathogenes in F1 and F2 hybrids obtained by the scheme of topcrosses. Results: Four sources for the resistance of winter bread wheat (Alyans, Doskonala, Crimson, the line 157/8-4) of economic traits have been chozen; 14 specimens from the world collection with a high and medium resistance (6-8 scores) to a group of diseases have been found; 32 hybridic combinations have been developed, these 6 are characterized by breeding value as to their productivity and resistance to leaf spots. Application stage: 3 specimens of winter bread wheat as to their resistance to disease pathogenes (Lutescens 20191, Charmany, Crimson) have been registered in the National Gene bank of Ukraine and 6 hybridic combinations have been introduced in the breeding programs of scientific-research institutes of Ukraine, such as: Myronivskyi Wheat Institute nd. a. V.M. Remeslo of NAAS, Plant Production Institute nd. a. V.Ya. Yuryev of NAAS. Application area: breeding institutions.