Linkage between genes for hairy first leaf and chlorophyll deficiency in Brassica oleracea

The fourth linkage group of B. oleracea L. has two genes: Hr-1, (hairy first leaf), a dominant seedling marker from “Dwarf Green” curly kale, and pg-2, (pale green seedling), a recessive chlorophyll mutant from green sprouting broccoli. Recombination between Hr-1 and pg-2 ranged from 7.4 to 20.1% in the six progenies studied, with a mean of 13.15±0.68%. Hr-1 segregated independently of the three other linkage groups (two genes of each were tested) and of two unlocated genes for male sterility.