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A second gene for bitterfree foliage in cucumber ( Cucumis sativus  L.) was discovered. In a cross between two inbred lines having bitterfree foliage (NCG-093 and WI2757), the F 1  progeny were bitter, the F 2  progeny segregation frequency fit a ratio of 9 bitter : 7 bitterfree, and the BC 1  segregation frequencies fit a ratio of 1 bitter : 1 bitterfree. Thus, a second factor nonallelic to the previous bitterfree gene,  bi , controls the bitterfree trait. When F 2  and BC 1  progeny resulting from crosses of bitterfree NCG-093 with other bitter lines were studied, the second factor for bitterfree in NCG-093 fit a recessive, single-gene model. The existence of a second, recessive bitterfree gene was confirmed in additional crosses, and the gene was designated  bi-2.  Further analysis of two crosses indicated that  bi-2  was linked with the short petiole ( sp ) gene (map distance = 11 cM).

Two-gene Interaction and Linkage for Bitterfree Foliage in Cucumber