Inheritance and linkage relationships among genes for fertility restoration ( Rf 1 ), resistance to rust, Puccinia helianthi Schw. ( R 1 ), resistance to downy mildew, Plasmopara halstedii (Farl.) Berl. et de Toni ( Pl 2 ), resistance to Verticillium wilt, Verticillium dahliae Kleb. (V), recessive branching ( b 1 ), and genetic male‐sterility ( ms ) were studied in sunflowers, Helianthus annuus L. The monogenic inheritance of each of these traits was confirmed. A close repulsion linkage, or allelic relationship, of R 1 with Pl 2 was identified on the basis of inoculations with races 1, 2, and 3 of rust and the Red River race of downy mildew, respectively. No recombinant types were recovered from among 543 F 3 lines and 105 F 4 lines tracing to two crosses. Independent inheritance was shown for Rf 1 with R 1 , b 1 , Pl 2 , and V ; R 1 with V ; Pl 2 with b 1 and V ; V with b 1 ,; and ms with b 1 .
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Fick et al. (1975) studied this question.