Author of the famous “Resynthesis of the domestic plum” discovery, based on the related plum species (Prunus cerasifera Ehrh.) and blackthorn (P. spinosa L.). He established for the first time in science, the diploid number of chromosomes (2n=2x=34) to 10 species of apple (Malus Mill.) and discovered meantime, forms and triploid species, explaining the cause of pollen sterility; obtained for the first time in the former Soviet Union autotetraploide forms of tobacco (Nicotiana L.), hemp and bean (Vicia faba) performed the cariology and systematic analysis of Solanum genus. As acknowledgment of scientific merit, one of the potato species Solanum rybinii was denominated. The classical works constitutes an important contribution to theoretical bases of selection, distant hybridization, polyploidy and evolution. On a practical level, V. Rîbin has elaborated the method of “amphidiploids’ synthesis” and demonstrated its effectiveness in the selection of plum in the winter hardiness based on hybrid trispecific: P. spinosa x P. ussuriensis x Renclod violet (ln=6x=48), with the participation of ussurian plum that resist heavy frosts of 55° C.