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Effect of Long Day Period Before Short Day treatment on the Dry Matter Production and Flower Quality of Greenhouse-Grown Cut Chrysanthemum cv, Reagan Improved  

백철기 (전남대학교 응용식물학부)
이정현 (네덜란드 와게닝겐 대학)
안규빈 (호남대학교 환경원예학과)
한태호 (전남대학교 응용식물학부)
정순주 (전남대학교 응용식물학부)
Publication Information
Journal of Bio-Environment Control / v.12, no.1, 2003 , pp. 1-6 More about this Journal
Abstract
This study was conducted under the condition of greenhouse to investigate the relationships between the period of long day (LD) treatment before short day treatment, the dry matter production and flower quality of cut chrysanthemum (Indicum group) cv. Reagan Improved at Wagenigen University in the Netherlands. Rooted cuttings of chrysanthemum (Indicum group) cv. Reagan Improved were transplanted on 6th, 13th, loth of September and all of them were treated with short-days (SD) on 21th September. The periods from planting until final harvest were 70, 77, 84 days after being planted for 1, 2, and 3 week-LD period, respectively. The time of flower initiation was similar in all treatments. The number of flowers per plant was greater in the plot of 3 week-LD period than that in the plot of 1 or 2 week-LD period. The fresh weight and dry weight of flowers also increased more in the plot of 3 week-LD period than that in the 1 week-LD period by 4g and 0.4g, respectively. The final dry matter production ($g{\cdot}m$^{-2}$ ) was greater in the treatment of 3 week-LD period than 1 or 2week-LD period. In this study, LD period before short day treatment did not affect the time of flower initiation and flower quality. As a result, 3 week-LD period before short day treatment was strongly recommanded for producing high quality cut flowers of greenhouse-grown chrysanthemum.
Keywords
Dendranthema grandiflorum; flowering; flower quality;
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