KMID : 0903620040450030149
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Journal of the Korean Society for Horticultural Science 2004 Volume.45 No. 3 p.149 ~ p.153
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Floral Development of Chrysanthemum Influenced by Photoperiod
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Lee Byung-Joo
Won Mi-Kyoung Choi Won-Chun Yang Euy-Seog Lee Jong-Suk Atherton Jeffrey Gordon
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Abstract
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A development of floral morphogenesis was presented from the vegetative to the late reproductive stages by photoperiod for chrysanthemum (Dendranthema grandiflorum) cultivars ¡®Envy¡¯ and ¡®Lady Time¡¯. To quantify the flowering process, times to specific stage assigned numerical values. When the developments of floral stages were plotted against time after the commencement of short-day induction, they produced nearly straight lines on a graph and it was possible to compare the flowering progress among various photoperiod treatments. Optimum photoperiod for progress to anthesis was 10 h in both cultivars. Plants grown under 10 h photoperiod reached anthesis up to seven days earlier than those grown at 8 or 12 h photoperiods. In continuous 14 and 16 h photoperiods, both cultivars eventually initiated flower buds (crown buds), which failed to reach anthesis. Final leaf number at anthesis in ¡®Envy¡¯ was less affected by photoperiod. While overall plant growth, measured as dry weight, stem length and leaf area, increased as photoperiods were extended from 10 to 16 h.
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KEYWORD
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anthesis, crown bud, Dendranthema grandiflorum, reproductive stage
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