Tsilynko M. Efficiency of selection for increasing productivity in rice breeding

Object: hybrids, lines and varieties on increasing of rice productivity. Aim: to development of methods of breeding of elite plants on direct of increasing of productivity and other economical properties. Methods: field, laboratory-field, phenological investigations, statistic. Novelty: it was investigated, that the indexes of variability and heritability of rice plant height as well as panicle length and the characteristics of its productivity had different values within the studied hybrid combinations. A direct correlation at medium level (r>0.70) between the number of grains in the main panicle and its productivity and compactness was found. The productivity of the main panicle considerably depended on its compactness and inessentially – on 1000-grain weight. Most of the component traits had a direct genotypically conditioned influence on the productivity. Results: the individual selection for different factorial traits causes quite high level of the marker trait reproduction; however, the number of the promising breeding lines with the resulted traits is less and depends on the degree of correlation between separate quantitative characters, their heritability, the intensity of selection and the growing space of the maternal plants. The maximum efficiency of selection was revealed when the marker trait «the number of grains per the main panicle» and the elite plants selection intensity of 5% with the growing space of the maternal plants of 15х15 cm were used. Application stage: it was took 6 author papers on rice liners, which were registreted on National center of genetic plant recourses of Ukraine (UIR-3471, UIR-3472, UIR-5161, UIR-5814, UIR-8458, UIR-5815). Application area: SIE of NAAN, MinAPK of Ukraine.