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Parthenocarpic Fruit Development from Grafted Ovaries of Cucuminis sativus L

^a Horticultural Experiment Station, Simcoe, Ontario, Canada

Reciprocal cleft and pistillate floral bud grafts were made between parthenocarpic `Fertilla' and nonparthenocarpic `MSU 713-5' cucumber (Cucumis sativus L.) lines to localize the site for stimulation of parthenocarpic fruit set. No fruit set on `MSU 713-5' controls, scion grafted to `Fertilla,' or rootstock with `Fertilla' as the scion. `Fertilla' controls, rootstock, and scions all produced parthenocarpic fruit when grafted to `MSU 713-5.' When pistillate floral buds of `MSU 713-5' were grafted to `Fertilla,' no fruit were produced. However, individual immature pistillate buds of `Fertilla' developed into mature fruits when grafted onto `MSU 713-5.' Hence, the immature ovary is the site of stimulation for parthenocarpic fruit set in cucumber.