Abstract
A dominant gene, Hr-2, from curly kale was studied in 10 F2 and 8 backcross progenies. Hr-2 acted additively with Hr-1 (hairy leaf margins) of linkage group 4 to produce relatively long hairs on the leaves, petioles and stems, whereas Hr-2 — hr-1 hr-1 plants had minute hairs best seen on the lower midribs. The data indicate linkage with 39.9 ± 0.7% recombination between Hr-1 and Hr-2 but the linkage could be spurious. An alternative hypothesis of incomplete penetrance of Hr-2 in an hr-1 hr-1 background is considered. Hr-2 was unmistakably linked to 1e, leaf excrescence, with 10.4 ± 0.6% recombination. If Hr-2 does in fact belong to linkage group 4, the gene order is pg-2 Hr-1 Hr-2 1e.
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