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Rate of Natural Outcrossing in Monoecious Cucumbers


The rate of natural outcrossing in cucumber (Cucumis sativus L.) was measured at 3 locations in North Carolina, using the dominant allele for scab resistance as the marker gene. Outcrossing was measured within and between 1.5 m plots in isolation blocks. Between-row outcrossing averaged 36% over the 3 locations, and within-row outcrossing averaged 17%. Self-pollination accounted for 47% of the pollinations. Results suggest that populations should be intercrossed either as single plants, or in family rows treated with growth regulators to control pollen flow and prevent sib- and self-pollination.