Yurchenko T. Variability of agronomic traits in hybrid generations of soft winter wheat in response to mutagens

Object of study - the regularities and peculiarities of variability and inheritance of characteristics of soft winter wheat productivity in hybrid-mutant combinations. The purpose of research - to study variability spectrum for agronomic traits and their inheritance in soft winter wheat hybrid generations in response to chemical mutagens. It is established that treatment of seeds of F1 hybrid populations improves frequency of transgressive variability for the agronomic characteristics in older generations. In assessing hybrid-mutant populations F3M2-F5M4 it was established the increase of variability range for traits such as stem length, total and productive tillering, spike length, spikelet number, grain number, indices of spikelet grain set, spike density and spike development synchrony, grain weight per main spike and per plant . By laboratory methods breeding value of new genotypes for their frost-resistance, heat and drought tolerance and grain quality in hybrid-mutant populations F2M1–F3M2 was determined. The range of variability of these traits appeared to increase in response to mutagenic treatment. Resulted from the research a collection of mutants of winter wheat was created and transferred for use in breeding process to NSC "Institute of Agriculture of NAAS" and Bila Tserkva National Agrarian University.The soft winter wheat varieties Horlytsia myronivs'ka, Trudivnytsia myronivs'ka, MIP Retro were created in collaboration. MIP Valensia variety (Line Erythrospermum 37328 – Yermak / Demetra, NMU-0.005 %) was developed by the mutagenesis program and submitted to the State strain testing.