Abstract
Gynoecious, gynomonoecious and monoecious cucumber varieties of foreign and Japanese origins were treated with gibberellin. Promoting effect of gibberellin upon staminate flower formation was strongest in gynoecious strains, weaker in gynomonoecious varieties and weakest in monoecious plants. As the result, the application of gibberellin diminshed the difference in sex expression between gynoecious and monoecious plants. It was also observed in all the treated varieties that gibberellin promoted the internode elongation of cucumber in low concentration but inhibited it in high concentration. Foreign gynoecious strains which had originally shorter internodes were more strongly offected than Japanese varieties in internode elongation, but no marked difference was found among Japanese varieties.
