Involvement of abscisic acid in the regulation of sex expression in the cucumber

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Abstract
The interaction between abscisic acid (ABA), gibberellin (GA) and ethephon on sex determination in cucumber (Cucumis sativus L.) flowers was examined. ABA promoted the female tendency of gynoecious plants, but did not change the sex expression of monoecious ones. When ABA was applied together with GA4+7 the promoting activity of the GA on male flower formation in the gynoecious line was reduced. ABA also inhibited tendril appearance and internode length, characteristic of GA treatments. A combined ABA and ethephon treatment resulted in a synergistic activity inhibiting growth and increasing the period of female flower appearance in the monoecious line. It is suggested that ABA participates in the sex regulation of the cucumber by inhibiting GA activity.

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