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Effect of Root Zone Temperature on the Induction of Inflorescence of Phalaenopsis in Summer  

Lee, Dong-Soo (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Lee, Young-Ran (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Yae, Byeong-Woo (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Publication Information
Horticultural Science & Technology / v.29, no.1, 2011 , pp. 10-15 More about this Journal
Abstract
The influence of root zone temperature to the induction of inflorescence and growth of Phalaenopsis was investigated. Root zone temperatures were 15, 20, 25, and $30^{\circ}C$, while the air temperature was kept over $28^{\circ}C$ during three months. $CO_2$ uptake, fresh weight, dry weight and branched root number of Phalaenopsis were highest at $25^{\circ}C$ and lowest at $15^{\circ}C$. But, the anthocyanin content was highest at $15^{\circ}C$ and lowest at $25^{\circ}C$. Inflorescence was not induced by root zone cooling temperature below $25^{\circ}C$ for three months. The concentrations of K, Ca and Mg in leaves were changed according to the root zone temperature, but those of N and P were not changed. K content was high at $20^{\circ}C$, whereas Ca and Mg contents were high at $25^{\circ}C$ root zone temperature. This study indicates that Phalaenopsis perceives temperature by shoot and the optimum root-zone temperature for the vegetative growth is $25^{\circ}C$.
Keywords
anthocyanin; $CO_2$ uptake; fresh weight; nutrient content; root number;
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