Abstract: The changes of carbohydrates distribution in Phalaenopsis' leaves and axillary buds were studied by two different temperature treatments. The experimental group was cultivated at 25℃/20℃(day/night), while the control group (control) was carried out in the plastic greenhouse. The results showed that areas of the young leaves increased faster in control than those of the experimental groups in primary stage of the experiment, but their area of mature leaves were approximately equal; while the dry mass of specific leaf area in experimental group exceeded that of control after 15 d treatment. Reducing sugar content of Phalaenopsis' leaves in experimental group dropped after reaching a peak at 20 d, and then elevated rapidly after 30 d and got the largest value which was 31.08 mg·g^-1DM at 50 d. While reducing sugar content in the axillary buds descended gradually. The content of soluble sugar, starch and total sugar in Phalaenopsis' leaves rose under the two treatments, but these carbohydrates of Phalaenopsis' axillary buds in experimental group increased rapidly in 15 d and then decreased slowly, at the same time these substances in axillary buds of control increased during the whole experiment. However, the total carbohydrates contents in both leaves and axillary buds in the experimental group were higher than those in control during the period of treatment.

Key words: Phalaenopsis, Floral induction, Carbohydrate