Klymchuk O. Initial material for corn hybrids breeding for growing under monoculture conditions Forest-stepp Ukraine

The thesis is devoted to the study of breeding material of corn for growing under monoculture conditions. The estimation of 50 self-pollinated lines of different ecological and geografic origin and 86 simple hybrids was conducted, on the basic of that the classification breeding material of corn of different ripeness type for the crop productivity and resistance to the pests and diseases in the monoculture are made. Series of self-pollinated lines, which have the basic agronomic characteristics in their genotype, suitable to the growing under monoculture conditions and are the valuable initial material for selection high crop productivity hybrids in these conditions are studied and selected. The traits which characterize the resistance of the initial material of corn to the conditions of monoculture are investigated. On the basis of research results the basic principles of paternal pairs selection and the way of simple hybrids inheritance of high crop productivity and resistance to the pests and diseases under monoculture conditions are formulated.