Abstract
Abstract Flower development of tuberous-rooted Dahlia ‘Park Princess’ and ‘Miramar’ was studied during 2 forcing seasons using scanning electron and light microscopy techniques. Each cultivar had a flat, rectangular (0.2 × 0.1 mm) vegetative meristem which domed and increased in diameter as the last leaf primordia developed. Subsequently, 8 outer involucrate bract primordia were formed and the meristem bacame round with a diameter of approximately 0.35 mm. The first visible sign of floral initiation was the formation of inner involucrate bract primordia. The floret primordium developed after the subtending bract primordium. The first unpinched plants of ‘Park Princess’ were reproductive 20 days after planting and 100% were reproductive after 30 days. ‘Miramar’ was reproductive 10 days later with a corresponding delay in anthesis. Unpinched ‘Park Princess’ and ‘Miramar’ were reproductive when the 4th and 6th leaf pairs had separated, respectively. When pinched, over 80% of the lateral branches of ‘Park Princess’ and ‘Miramar’ were reproductive after 12 days.
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