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Effect of Shading Level on the Induction of Inflorescence and Growth of Phalaenopsis Hybrid  

Lee, Dong Soo (Floriculture Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Yae, Byeong Woo (Floriculture Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Lee, Yong Beom (Department of Environmental Horticulture, University of Seoul)
Lee, Young Ran (Floriculture Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Publication Information
FLOWER RESEARCH JOURNAL / v.19, no.1, 2011 , pp. 37-41 More about this Journal
Abstract
This experiment was carried out to find an optimum shading level for the growth of root and shoot, and to find the effect of shading level after August on the induction and growth of inflorescence of Phalaenopsis hybrid. The shading levels were 50%, 60%, 70%, 80% and 90% of natural light($1200{\mu}molm^{-2}s^{-1})$. The $CO_2$ uptake, transpiration rate, carbohydrate content, fresh weight and dry weight of Phalaenopsis hybrid were higher at 50-60% level than the others. But, it was diminished when the shading level was increased from 70% to 90%. Inflorescence length, the number of inflorescence and flower per plant all increased under 50-60% shading level and the day needed for the flowering after treatment decreased. Especially, the induction of inflorescence was depressed and flowering is not occurred under 90% during experiment period. These results suggest that the optimal shading level for the growth of Phalaenopsis including inflorescence was founded to be 50-60% in the season of light intensity and amount of sunshine decrease after august.
Keywords
carbohydrate content; $CO_2$ uptake; dry weight; fresh weight; relative growth rate;
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