Study On The Relationship Between Flower Bud Physiological Differentiation And The Metabolism Of Some Substances In Waxberry Tree

The objective of this study was to evaluate the changes of some substances in 'Dongkui' waxberry trees (Myrica rubra Sieb. & Zucc.) during the flower bud physiological differentiation. The results showed as follows:1. The flower bud physiological differentiation of 'Dongkui' waxberry trees began shortly after the summer shoots ceased to grow, from the end of June to the middle of July with abundance at the beginning of July.2. The contents of soluble sugar and sucrose increased at the beginning of flower bud physiological differentiation, and then decreased, the high contents of soluble sugar and sucrose might had a positive effect on flower bud physiological differentiation in waxberry trees. So, the range of higher increasing of sucrose could be acted as an index of percentage of flower bud differentiation, the higher increasing, the higher percentage of flower bud differentiation. The content of starch was not a determinal factor in the flower bud differentiation of waxberry trees.3. The contents of total nitrogen and carbohydrate decreased at the beginning of flower bud physiological differentiation, and then increased, while the ratio of C/N had a reversed trend. The range of lower decreasing of total carbohydrate could be used as an another index of percentage of flower bud differentiation, the lower of content decreasing, the higher percentage of flower bud differentiation.4. The contents of ten mineral nutrients during the flower bud physiological differentiation were N>K>P>Ca>Mg>Mn>Fe>Zn>B>Cu. The contents of P and K decreased during the flower bud physiological differentiation, while that of Ca and Mn increased. The contents of Cu, B, Fe and Zn decreased before the climax of flower bud physiological differentiation, and then increased. The contents of N and Mg showed the opposited of Cu, B and Zn. Adding P,Fe and B before flower bud physiological differentiation, could heighten the percentage of flower bud differentiation (PF).5. The content of IAA increased during the flower bud physiological differentiation. The content of GA₃ decreased just at the start of flower bud physiological differentiation, and then increase. ABA was reversed. The reducing content of GA₃ was necessary to the flower bud physiological differentiation.