Abstract
Effects of gibberellin A4 (GA4) and three GA biosynthesis inhibitors, uniconazole (UCZ), prohexadione-calcium (PCa), and trinexapac-ethyl (TNE) on growth and flowering of Matthiola incana (L.) R. Br. were investigated. In an early flowering 'Sourei', UCZ inhibited stem elongation and flowering. GA4, PCa and TNE promoted flowering at 20°/15°C and 25°/20°C (day/night) under 12-hr photoperiod as compared to the control. However, only PCa and TNE induced flowering of a late flowering 'Banrei' at 20°/15°C. Flowering was not induced in any treatment at 25°/20°C and 30°/25°C but stem elongation of both cultivars was promoted by GA4 and PCa at all temperatures. Under green house conditions in the winter, PCa promoted flowering of 'Banrei'. Although GA4 and PCa promoted stem elongation, they did not induce flowering in the summer. These results indicate that biosynthesis of GA4 and its deactivation are important factors that control stem elongation and flowering.
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