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Inheritance, Linkage, and Gene Interaction Studies in Lettuce


Two new lettuce genes are described and named: chlorophyll deficient-2 (cd-2) and Early flowering (Ef). Brown pericarp is either a pleiotropic effect of plump involucre (pl) or is caused by a closely linked gene. White pericarp (w) is epistatic to brown. Endive-like leaf (en) and white pericarp are linked, with P = 0.47. Virescent (vi) and fringe (fr) are linked, with a recombination value of p = 0.25. Genes for spininess and anthocyanin color are linked. Endive, white, virescent, fringe, and male sterile-6 (ms-6) form a linkage group. Three other double recessives have interactive relationships. Endive and fringe together are phenotypically extreme endive; virescent and golden (go) together are golden; golden and chlorophyll deficient-2 are golden and partially lethal.