Vegetative Growth Characteristics of Phalaenopsis and Doritaenopsis Plants under Different Artificial Lighting Sources

• Published in: Weon'ye gwahag gi'sulji Vol. 35; no. 1; pp. 21 - 29
• Main Authors: Lee, Hyo Beom, An, Seong Kwang, Lee, Seung Youn, Kim, Ki Sun
• Format: Journal Article
• Language: English
• Published: 한국원예학회HST 01.02.2017; 한국원예학회
• Subjects: 농학; closed plant - production system; light quality; light-emitting diodes; light intensity; orchid
• ISSN: 1226-8763; 2465-8588
• DOI: 10.12972/kjhst.20170003

This study was conducted to determine the effects of artificial lighting sources on vegetativegrowth of Phalaenopsis and Doritaenopsis (an intergeneric hybrid of Doritis and Phalaenopsis )orchids. One - month - old plants were cultivated under fluorescent lamps, cool - white light -emitting diodes (LEDs), or warm - white LEDs at 80 and 160 μmol·m-2·s-1. The blue (400 - 500 nm) : green(500 - 600 nm) : red (600 - 700 nm) : far - red (700 - 800 nm) ratios of the fluorescent lamps, cool-whiteLEDs, and warm-white LEDs were 1 : 1.3 : 0.8 : 0.1, 1 : 1.3 : 0.6 : 0.1, and 1 : 2.7 : 2.3 : 0.4, respectively. Each light treatment was maintained for 16 weeks in a closed plant-production systemmaintained at 28°C with a 12 h photoperiod. The longest leaf span, as well as the leaf length andwidth of the uppermost mature leaf, were observed in plants treated with warm-white LEDs. Plants grown under fluorescent lamps had longer and wider leaves with a greater leaf span thanplants grown under cool-white LEDs, while the maximum quantum efficiency of photosystemII was higher under cool-white LEDs. The vegetative responses affected by different lightingsources were similar at both 80 and 160 μmol·m-2·s-1. Leaf span and root biomass were increased bythe higher light intensity in both cultivars, while the relative chlorophyll content was decreased. These results indicate that relatively high intensity light can promote vegetative growth ofyoung Phalaenopsis plants, and that warm - white LEDs, which contain a high red-lightratio, are a better lighting source for the growth of these plants than the cool-white LEDs orfluorescent lamps. These results could therefore be useful in the selection of artificial lighting tomaximize vegetative growth of Phalaenopsis plants in a closed plant - production system. KCI Citation Count: 10