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A new trait, twin fused fruit, was discovered in gynoecious cucumber (Cucumis sativus L.) line B 5263. Plants with the twin fused fruit trait had two fruit fused into a single unit. In addition to having the twin fused fruit trait, line B 5263 had fruit with necks, large tubercles (warts), and dark green skin. The inheritance of twin fused fruit was studied in populations resulting from crosses between gynoecious line B 5263 (twin fused fruit) and monoecious line B 5404 (single fruit). Research was done in 1999 to 2001 in the greenhouses of the Research Institute of Vegetable Crops, Skierniewice, Poland. The F 1 progeny developed single fruit in all cases. The observed distribution of plant phenotypes in the F 2 fitted the expected ratio of 3 with single fruit: 1 with twin fused fruit. The observed distribution of plant phenotypes in the BO 1A fitted the expected ratio of 1 with single fruit: 1 with twin fused fruit. Twin fused fruit occurred only in gynoecious plants, and never in monoecious plants of the cross. In the F 2 progeny, the ratio of twin fused fruit within gynoecious plants fitted the expected ratio but the gene was not expressed in monoecious plants. In the F 2 generation, the observed distribution of plant phenotypes fitted the expected ratio of 9 gynoecious single: 4 monoecious single: 3 gynoecious twin fused: 0 monoecious twin fused, indicating that there was epistasis, with twin fused fruit hypostatic to monoecious. The new gene will be named tf(twin fused fruit).

Inheritance of a New Trait—Twin Fused Fruit—in Cucumber