Influence of heating a heterogeneous pollen population on some quantitative characters of the resulting sporophytic generation was studied in sunflower. Pollen of interspecific hybrids H. annuus cv. Lider x H. argophyllus and H. annuus cv. Yubileiny x H. bolanderi was treated with the temperature of 40-60℃ during 1-3 hours, then used for backcrossing. Heating pollen at 60ºC for 3 hours was most effective. This treatment significantly increased the frequency of taller plants as well as the portion of genotypes with longer emergence-flowering stage and minimum number of branches. Taking into consideration that the parental forms of the used hybrids differed in these traits, the conclusion can be drawn that heat treatment selectively affected pollen grains favoring gametes of a cultivated genotype.