Abstract
SummaryThe vegetative growth and flowering patterns of dwarf tomatoes were altered by 10–7 M to 5 x 10–3 M gibberellin A3 concentrations. The six dwarf cultivars studied differed in their sensitivity to the gibberellin as indexed by stem elongation, stem size, change in leaf angles, leaf area expansion, number of leaf nodes, cotyledon abscission, days to first anthesis and flower numbers on the inflorescences. Vegetative growth was more responsive to gibberellin than was flowering.A significant interaction in leaf area was observed between leaf position (or age) and gibberellin A3 concentration. In general, the leaf areas of the older maturing leaves located centrally on the main stem were inhibited, while the younger immature leaves near the growing apex were promoted by high gibberellin concentrations. A possible explanation for this phenomenon is discussed.
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