Interactions of Gibberellin, Vernalization, Photoperiod and Temperature in the Flowering of Endive

Abstract
Biweekly applications of the K salt of gibberellic acid (50 or 100 [mu]g/plant) to growing plants (but not to seed) qualitatively replaced the requirements both for vernalization and long day for flowering of Cichorium endivia grown at day/night temperatures of 23[degree]/23[degree]C, 23[degree]/17[degree]C and 23[degree]/10[degree]C. Gibberellic acid did not overcome the unfavorable effect of low (10[degree]C) or high (23[degree]C) night temperature on stem elongation.