Variation in the effects of ethephon on flowering and extension growth in chrysanthemum as a function of temperature,season, and genetics |
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Authors: | K Sumitomo T Kunitake M Douzono T Onozaki M Shibata T Hisamatsu |
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Institution: | 1. National Institute of Floricultural Science (NIFS), National Agriculture and Food Research Organisation (NARO), 2-1 Fujimoto, Tsukuba, Ibaraki 305-8519 Japanjordi.marsal@irta.es;3. Fukuoka Agricultural Research Center, 587 Yoshiki, Chikushino, Fukuoka 818-8549 Japan;4. National Institute of Floricultural Science (NIFS), National Agriculture and Food Research Organisation (NARO), 2-1 Fujimoto, Tsukuba, Ibaraki 305-8519 Japan |
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Abstract: | SummaryEthephon (2-chloroethylphosphonic acid), an ethylene-releasing agent, is used in the production of Summer-to-Autumn-flowering chrysanthemums (Chrysanthemum morifolium Ramat.) to avoid early budding under long-day conditions. This study was carried out to show the variation in response to ethephon due to temperature, season, and cultivar. The seasonality of growth and flowering capacities, growing temperatures, and the genetic background of chrysanthemum make the effects of ethephon unstable and variable. The most important factor modifying the effect was the response to temperature, which showed seasonal variation. Ethephon briefly suppressed extension growth and flowering after chilling and at high growing temperatures. On the other hand, it induced dormancy and rosette formation, and suppressed flowering after Summer, and at lower temperatures. This suggests that ethylene is involved in the induction of dormancy. |
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