Morphactin-induced parthenocarpy in the cucumber.

Area of Science:

• Plant reproductive biology
• Horticultural science
• Plant growth regulators

Background:

• Parthenocarpy, or the development of fruit without fertilization, is a desirable trait in cucumber cultivation.
• Understanding the hormonal and chemical control of fruit set is crucial for improving crop yields and fruit quality.

Purpose of the Study:

• To investigate the efficacy of morphactin in inducing parthenocarpy in cucumber (Cucumis sativus L.).
• To determine the optimal application timing and synergistic effects with Ethrel for enhanced parthenocarpic response.

Main Methods:

• Cucumber plants were treated with morphactin (chlorfluorenol) via foliar application.
• Application timing varied, including the flowering stage.
• Investigated combined treatments with Ethrel (2-chloroethylphosphonic acid).
• Evaluated effects on pistillate flower development and sex expression in different cucumber cultivars.

Main Results:

• Foliar morphactin application successfully induced parthenocarpy in cucumbers.
• Optimal induction occurred when morphactin was applied during the flowering stage.
• Prior treatment with Ethrel significantly enhanced the morphactin-induced parthenocarpic response.
• Morphactin promoted pistillate flower development in monoecious cucumber lines but did not alter sex expression in gynoecious lines.

Conclusions:

• Morphactin is an effective agent for inducing parthenocarpy in cucumbers.
• Timing of morphactin application and combination with Ethrel are key factors for maximizing seedless fruit production.
• Morphactin influences floral development pathways, specifically promoting female flower development in certain genotypes.