Flowering responses, in terms of days to flowering and number of nodes below the flower, were studied in 23 cultivars or breeding selections by planting monthly at Taichung District Agriculture Improvement Station (lowland) and Chung-Yang farm (altitude 1100 m) in spring and summer, respectively. Fifteen out of 23 cultivars or selections flowered when planted monthly from March, 1999 to August, 1999 at lowland. Three groups can be classified according to their differences of days to flowering between two successive months from June to August. The groups I consisted of 12 cvs. or selections, which flowering was prevented or delayed for more than 20 days. Groups II contained four cvs or selections, which could flower but with heat delay for 10 to 20 days. In the group III, there were seven heat-tolerant cultivars or selsecions with heat delay fewer than ten days.
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