Abstract
The flowering time and flower quality of three hybrid Dendrobium nobile cultivars in relation to light intensity during cooling and duration of vernalization were studied in the first experiment. Mature Dendrobium Red Emperor âPrinceâ, Den. Sea Mary âSnow Kingâ, and Den. Love Memory âFizzâ plants were vernalized at 10 °C under 300 to 350 Îźmol¡mâ2¡sâ1 photosynthetic photon flux (PPF) (12-h photoperiod) or darkness, each with four cooling durations (2, 4, 6, or 8 weeks). Plants were forced in a greenhouse after vernalization. At least 4 weeks of 10 °C cooling in light was needed for complete flower initiation of Den. Red Emperor âPrinceâ, whereas Den. Sea Mary âSnow Kingâ and Den. Love Memory âFizzâ only needed 2 weeks of 10 °C cooling regardless of light. For all three cultivars, darkness during vernalization slightly delayed flowering and resulted in fewer but larger flowers. Longer cooling duration delayed flowering, decreased flower longevity, and produced more and larger flowers. In a second experiment, Den. Love Memory âFizzâ plants were vernalized at 15 °C for 4 weeks under a 12-h photoperiod and PPF of 0, 50, 100, or 200 Îźmol¡mâ2¡sâ1. Compared with 200 Îźmol¡mâ2¡sâ1, low PPF at 50 or 100 Îźmol¡mâ2¡sâ1 did not affect flowering time or flower qualities; however, darkness delayed flowering and reduced flower qualities except flower diameter.
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