Deferring flowering of nobile dendrobium hybrids by holding plants under low temperature after vernalization |
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| Authors: | Min Lin Terri W Starman Yin-Tung Wang Genhua Niu J Tom Cothren |
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| Institution: | 1. Department of Horticultural Sciences, Texas A&M University, College Station, TX 77843-2133, USA;2. Matsui Nursery, 1645 Old Stage Road, Salinas, CA 93908, USA;3. Texas AgriLife Research at El Paso, Texas A&M University, El Paso, TX 79927, USA;4. Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474, USA |
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| Abstract: | Orchids are currently the most valuable potted crop in the United States. To date, no studies focused on making possible the year-round greenhouse production of flowering nobile dendrobium orchids. This experiment was aimed at developing a strategy to defer flowering of nobile dendrobium orchids by holding them under low temperature. Mature Den. Red Emperor ‘Prince’ and Den. Sea Mary ‘Snow King’ were held at 10 °C for various durations (0, 4, 8, 12 or 16 weeks) after vernalization (4 weeks at 10 °C). Plants were forced in a greenhouse after holding. Time to flower, flower differentiation (flowering node percentage, number of aerial shoot and aborted bud) and flower quality (total flower number, flower diameter, flower number per flowering node and flower longevity) were determined. Increase of low temperature holding duration from 0 to 16 weeks extended time to flower up to 3 months and did not affect parameters of flower except producing larger flowers and reducing flower number per flowering node for Den. Red Emperor ‘Prince’. Notably, the flower longevity was not adversely affected. Defoliation was aggravated in Den. Red Emperor ‘Prince’ by longer duration of cooling and was considered a detrimental effect of low temperature holding. |
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| Keywords: | Orchid Dendrobium nobile Flowering control Vernalization |
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