An interegeneric hybridization is conducted with species from the genera Tithonia and Helianthus. Hybrid plants F1 - F4 between H. annuus and T. rotundifolia are produced. The inheritance of characters in F1 is intermediary and specific depending on the forms used. Plants are produced in next generations witlr valuable characters which could be useful in breeding. A presence of restoring genes of fertility is fund in T. rotundifolia for the cytoplasms of H. petiolaris and H. argophyllus. On the basis of these genes new restorers are developed for these two cytoplasms.