Abstract:

In order to investigate the changes of nutrients in the Cymbidium flower bud differentiation process, the changes of carbohydrates of the leaves and axillary buds in Cymbidium were studied with two different treatments (Treated at an altitude of 1000 m high mountain intelligent greenhouses, control group was placed in the greenhouse within the plains). The results showed that: (1) the pseudobulb of treatment group grew faster than that of control group and the flower buds of 2 cm appeared in 90 d. (2) reducing sugar content in the two sets of leaves increased within 90 d, while the reducing sugar content decreased in the axillary bud. The treatment group changed faster than that of the control group. (3) treated leaf soluble sugar content reached the maximum value of 118.4 mg/gDM in 90 d; soluble sugar in axillary bud reached a high point of 107.6 mg/gDM in 50 to 60 d. (4) the starch content of the treated leaves and axillary buds in about 60 d to reach the maximum value of 65.8 mg/gDM and 43.8 mg/gDM; control group leaves and axillary bud starch content in 90 d to maximum value of 56.8 mg/gDM and 39.6 mg/gDM. The low day temperature and a larger temperature difference between day and night promoted accumulations of nutrients in Cymbidium, and facilitated flower bud differentiation for early flowering.