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Monoecious cucumber (Cucumis sativus L.) parents with high, medium, and low percentage of nodes with distillate flowers had a stronger effect on the percentage of gynoecious plants in F 1 and F2 progenies than did degree of gynoecious expression in incompletely gynoecious parents. Highest percentages of gynoecious plants were obtained by using both gynoecious and monoecious parents with the highest level of distillate flowering tendency. According to our data, monoecious parents with a low percentage of distillate flowering nodes should be avoided when gynoe- ciousness is transferred to monoecious cultivars. Self-pollination of gynoecious F 2 plants, requiring induction of staminate flowers by chemical treatment, was more effective in obtaining a high percentage of gynoecious plants in F3 progenies than selfing predominately gynoecious plants, or sibmating predominately gynoecious plants. Monoecious plants of cucumber vary quantitatively in sex expression from predominately staminate to predominately dis- tillate. Some monoecious lines produce staminate and distillate flowers throughout the growing season. Others produce stami- nate flowers at the base, followed by a mixture of staminate and distillate flowers, and then only distillate flowers (Kubicki, 1965, 1969a, 1969b, 1972; Shifriss, 1961). Gynoecious plants bear only distillate flowers that are mostly solitary in the leaf axils of the main axis arid side branches. The gynoecious character is not always complete or stable in cucum- bers. In this report, "PG" will refer to plants or lines that produce predominately distillate flowers, while the term "gyn- oecious" will refer to completely distillate plants. Gynoecious cucumbers can be induced to produce staminate flowers, when

Parents and Mating Systems Affect the Transfer of Gynoecious Flowering to Chinese Monoecious Cucumbers