| Popis: |
The inheritance of resistance to Orobanche cumata (sunflower broom-rape) in the resistant sunflower lines SW-501 and RW-637 and the hybrid Sunbred-254 was studied in crosses with susceptible sunflower cultivars Aya and DI-1, in the field and in the growth chamber. Resistance in SW-501 and RW-637 was conferred by a single dominant gene. SW-501 was homozygously resistant, and RW-637 was heterozygously resistant, having one resistance allele and one susceptible allele. The testcross progeny of Sunbred-254 (SW-501 X RW-637) to the susceptible Aya segregated 3 resistant: 1 susceptible, indicating that Sunbred-254 is composed of two genotypically different subpopulations in equal parts, representing the genetic differences between RW-637 and SW-501 in the resistance to Orobanche cumana |
