IN-VITRO TENDRIL AND FLOWER DEVELOPMENT IN CUCUMBER (CUCUMIS-SATIVUS)MAY BE REGULATED BY GIBBERELLINS

Cucumber seeds and seed parts initiated flowers in vitro three to four weeks after explanting seeds and seed parts on Murashige and Skoog sa lts medium supplemented with either BA or GA(3); tendrils developed on medium with GA(4+7). The flowering responses to GA(3) and BA were sig nificantly different from cultures supplemented with GA(4+7) (P<0.05). The simultaneous and exclusive appearance of flowers and tendrils on medium with different growth regulators suggest that cells or tissues are uncommitted to specific types of organ differentiation until the n ecessary growth regulators to trigger differentiation are either produ ced or made available. The ability to control flowering could facilita te repeated cycles of inbreeding in vitro and speed up the breeding pr ocess for cucurbits.