Studied in this paper was the effect of PETI and ANN5 cytoplasms on plant height, hectoliter mass, seed kernel content, and seed husk content of four inbred sunflower lines as well as of the crosses of the lines' sterile forms with three restorers. In the crosses, heterosis relative to the parental mean (H1) and heterosis relative to the better parent (H2) were calculated. PETI cytoplasm affected plant height in lines L-1, L-10, and L-14, hectoliter mass in all of the lines, and on seed husk content in lines L-11 and L-10. ANN5 cytoplasm, for its part, influenced plant height in lines L-10. L-14, and L-19 and on hecto- liter mass in lines L-1, L-10, and L-14. PET1 cytoplasm caused no significant increase in the seed kernel content of the lines, and ANN5 cytoplasm did not significantly increase the lines' kernel and husk contents, either. The said cytoplasms' effects on the expression of the quantitative traits under study were not equally significant in all of the crosses. The incorporation of PET1 cytoplasm proved the most useful in the L-10P x RHA-1 cross, where it caused highly significant increases of plant height, hectoliter mass, and seed kernel content as well as a decrease of seed husk content. ANN5 cytoplasm, on the other hand, was most effective in the cross L-14A x RHA-2, in which it produced a highly significant increase in hectoliter mass, a significant increase in seed kernel content, and a highly significant decrease of seed husk content as well as a certain decline in plant height.