Sexual differentiation in cucumber : The effects of abscisic acid and other growth regulators on various sex genotypes

概要

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AbA, ethephon and gibberellin were applied to cucumber plants of monoecious, gynoecious, andromoneocious and hermaphrodite inbred lines, as well as to F_1 (gynoecious × monoecious) plants. Exogenous AbA enhanced the male tendency in monoecious cucumber plants and the female tendency in gynoecious plants, irrespective of light regime. Exogenous ethephon treatments increased the female tendency in monoecious plants, and decreased it in gynoecious ones. These effects were influenced by day length. Exogenous AbA counteracted the effect of gibberellin (A_<4+7>) treatment in gynoecious plants, but had no such effect in monoecious. ones. In addition to its differential effect on sexual differentiation, AbA stimulated flower development in gynoecious plants and inhibited it in monoecious plants. These responses to AbA are discussed in the light of previously reported effects of plant growth regulators on various sex types of cucumber. The present results are being integrated into an updated working hypothesis on sex control in cucumbers.