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The morphological and physiological effects of Lilium lancifolium Thunb. according to several DIF treatments were investigated. Plants were grown under 16 different day/night temperature combinations with 16, 20, 24, and 28℃ set in 4 growth chambers which were maintained in a 12 hour photoperiod, 9,900 lux light intensity, and 75% relative humidity. Plant height increased with increasing DIF from negative to positive. Particularly, stem elongation during 2 weeks to 4 weeks which were early stages of growth was highly responsed to DIF. Average daily temperature (ADT) affected flowering rate which was profoundly decreased as ADT increased. In addition, flowers abortion appeared when ADT became above 24℃, regardless of DIF. Leaf orientation increased with increment from - to + DIF at later stage of growth than early stage. Lilium lancifolium was found to be cool season crop under considering that photosynthetic rate did not increased although temperature increased from 16 to 28℃. This fact could be reconfirmed by leaf unfolding rate which was more increased by lower ADT. Fresh and dry weight are more affected by ADT than by DIF and both increased as temperature decreased. Therefore, there was no relationship between fresh weight and plant height. The optimum day/night temperature combination which could shorten stem length without interfering flowering was found to be 16℃ for DT and 24℃ for NT.
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