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KMID : 0903620040450060345
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Journal of the Korean Society for Horticultural Science
2004 Volume.45 No. 6 p.345 ~ p.348
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High Temperature-Induced Flower Abnormalities at Bud Development in Chrysanthemum
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Huh Eun-Joo
Shin Hak-Ki
Kim Kwang-Jin
Choi Seong-Youl
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Abstract
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The effects of high temperature (HT) on flower development were examined on chrysanthemum [Dendranthema × grandiflorum (Ramat.) Kitamura]. Plants exposed to HT developed two types of abnormal flowers. One formed only ray florets, and the other developed ray florets with bracts at the center of the disk. These abnormal flowers occurred when the plants were exposed to a HT of 35℃ from 14 to 27 days after the start of short day (SD). The most susceptible developmental stage was 14 to 20 days after SD. Having a 4-h HT period before nighttime induced abnormal inflorescence and delayed flowering. This result suggested that HT just before night especially from 14 to 20 days after SD is responsible for abnormal flower formation in a single type of chrysanthemum.
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KEYWORD
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abnormal flower, days to flowering
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