Genetic control of the form of the ray flowers in sunflower

«OIL CROPS» Scientific bulletin, VNIIMK, 2006, is 2 (135). Genetic control of the form of ray flowers in sunflower with collection accessions was researched. Three non-allelic genes ("tu1" "tu2" and "hb")., determined different types of the tube of ray flowers and two genes ("lr", "shs")., determined differences in the form of the ray flowers were identified. Intergenic and allelic interactions for all genes were estimated. The gene linkage for "tu1" and "l" (lemon ray flowers). with 4.2 % of crossing-over was revealed.