Studies On The Mechanism And Regulation Of Florescence Of Phalaenopsis

In this paper, the key techniques about the cultivation and regulation of florescence of pot Phalaenopsis were studied adopting the means of potted experiments and indoors analyzes combined with production. The results can be summarized as follows:1 Orthogonal experiment indicated that vegetative growth (especially total leaves) and bud differentiation were affected significantly by nitrogen and phosphorous respectively, while stalk thickness were influenced by calcium and leaves were fallen by high concentration magnesium for two cultivars. To'Queen beer', the optimum fertilization proportions (N-P2O5-K2O-CaO) for vegetative growth was 40-5-5-10-20, while to'2048'the optimum was 40:5:10:10:10. The variety'2048'was sensitive to fertilization proportions test. The optimal treatment for promoting bud differentiation was T9(N-P2O5-K2O-CaO: 20-40-20-5), which also made leaves thicker and ornamental value was better than the control.2 Great physiological and biochemical changes had happened in the leaves during the forcing cool temperature for bud differentiation: changes of nitrogen and phosphorous were in the same direction; changes of the soluble sugar were contrary to the starch; changes of free amino acid were opposite of the soluble protein. Peroxidase content increased gradually at the beginning, then arrived at a peak with bud appearance, then decreased rapidly. However, there were no rules to find in the leaves of control in sub-mountain. Great changes of Potassium had happened during stalk elongation.3 Bud differentiation rate with daubing or spraying 25mg/kg 6-BA was more 8.3% than that of the control; 50mg/kg GA and 25mg/kgPP333 were more16.6% than that of the control; Bud differentiation rate was not significantly affected by B9; TDZ was of no use to bud differentiation induction. There was no flower bud emergence in the control with three plant growth regulators (6-BA, B9, PP333) in sub-mountain. It could be concluded that cool temperature is the key factor to induce bud differentiation.The experiment of shortening stalk showed that the suitable treatment was 250mg/kg PP333 and the height of stalk was 6.97cm shorter than the control. PP333 was mainly shortened the first internode of florescence and delayed the flowering time.4 The experiment of flower bud induction revealed that 6-BA treatment was the best...