Effects of light quality during supplemental lighting on Phalaenopsis flowering

The purpose of this study was to understand the effects of supplemental lighting (SL) quality from light emitting diodes (LEDs) on the year-round flowering of Phalaenopsis. First, we examined the effects of SL quality of different white LEDs on flowering responses using Phalaenopsis amabilis, which is a wild species and the breeding parent of commercial cultivars.
We compared the effect of SL using a warm white LED (WW-LED; 2700 K) and a cool white LED (CW-LED; 5000 K). The lighting was delivered at 100 µmol m^‑2 s^‑1 PPFD from 6:00 to 22:00 in a greenhouse.
Both LED types had higher number of inflorescences and florets than those plants not provided SL. However, the effect of the WW-LED was greater than that of the CW-LED. Second, to verify the practical effect of the WW-LEDs, we conducted a demonstration test of SL using the same two LEDs in a commercial greenhouse with Phalaenopsis Sogo Yukidian V3. The lighting was delivered at 50 µmol m^‑2 s^‑1 PPFD from 2:00 to 22:00. Both LED types promoted the growth of inflorescences and increased the number of florets and floret size compared to plants not provided SL. However, the WW-LED was more effective.
Therefore, high-quality potted flowering plants could be produced in the future using SL from WW-LEDs.

III International Orchid Symposium

Y.G. Magar, A. Noguchi, S. Furufuji, H. Kato, W. Amaki

artificial light, flower quality, light emitting diode, Phalaenopsis amabilis, photomorphogenesis

https://doi.org/10.17660/ActaHortic.2019.1262.11