Abstract
The effects of the quality of night interruption (NI) on the morphogenesis and flowering were investigated in Petunia hybrida Hort. “Easy Wave Pink” (qualitative long-day plant), Pelargonium × hortorum L.H. Bailey “Ringo 2000 Violet” (day-neutral plant), and Dendranthema grandiflorum “gaya yellow” (qualitative short-day plant). Plants were grown in a closed-type plant factory under a light intensity of 180 μmol·m−2·s−1 PPFD (photosynthetic photon flux density) provided by white (W) light-emitting diodes (LEDs) under a condition of either long day (LD, 16 h light/8 h dark), short day (SD, 10 h light/14 h dark), or SD with 4 h NI. NI was provided by 10 ± 3 μmol·m−2·s−1 PPFD.
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