초록

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Abstract ▼ AI-Helper

The effects of high temperature (HT) and day length on abnormal flower formation and delay in flowering were examined using four spray chrysanthemums (‘Lerbin’, ‘Relance’, ‘Wembley’, and ‘Kinhusha’). Examination was focused on the flower development stage, especially from 14 days to 27 days after sh...

The effects of high temperature (HT) and day length on abnormal flower formation and delay in flowering were examined using four spray chrysanthemums (‘Lerbin’, ‘Relance’, ‘Wembley’, and ‘Kinhusha’). Examination was focused on the flower development stage, especially from 14 days to 27 days after short day (SD). The delay in flowering caused by HT (35/20℃) was the least on ‘Wembley’, and in ascending order of ‘Kinhusha’, ‘Relance’, and ‘Lerbin’. Among the four cultivars, abnormal flowers occurred only in ‘Lerbin’ at HT. Flowering was delayed in all cultivars as day length increased from 13 to 14 hours (h) and abnormal flower formation was induced at over 13 h day length only in ‘Lerbin’. The effect of HT was different depending on the exposed placement within a day. The plants exposed to HT just before nighttime showed severe abnormality and flowering delay. Flowering of ‘Kinhusha’ was slightly delayed at 4 h HT just before night time, without any abnormal flowers. However, ‘Relance’ and ‘Wembley’ were not affected by the heat period in a day. These results suggest that although formation of abnormal flowers and delay in flowering were equally induced by HT and the long day condition, physiological mechanisms associated with these disorders are probably different from each other.

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