Makarchuk O. The inbred lines and testers of different genetical structure using for maize breeding for heterosis.

Subject of research - the regularities of economic characters in self-pollinated maize lines and hybrids. The aim - to identify and to use new inbred lines, to ascertain criterian of tester selection for line combining ability determination when developed maize hybrids. The methods - visual, measuring and weight, biometric, mathematical and statistical. The value and novelty of research - details of line combining ability manifestation in consequence of using testers of different genetical structure are esteblished, the most efficient testers are picked out; genetical sources that are distinguished by the detailsof grain productivity from a plant are revealed. The introduction - inbredmaize lines are entered in the National Catalogue of Inbred Lines of the National Centre of Plant Genetic Resources of Ukraine and are introdused in breeding work. The branch of application - breeding research institutions.