Abstract:

The aim was to provide a theoretical basis for the flowering regulation of cymbidium. Before flower bud differentiation of cymbidium, GA3, IBA, NAA and PP333 with different concentrations sprayed leaves and pseudobulb. The effect of different treatments on flower bud differentiation of cymbidium was studied, and the endogenous hormone levels were also studied in pseudobulb. The results showed that: (1) the exogenous hormones may affect the flowering of cymbidium seedlings. GA3 and PP333 facilitated the bud differentiation of cymbidium. Depending on the different concentrations, earlier flowering time is from 2 to 12 days. The different concentrations of NAA treatment inhibited bud differentiation; the flowering delayed 4 to 11 days. (2) IBA treatment could significantly promote the growth of flower arrows; PP333 treatment inhibited the growth of the flower arrows. The treatments had no significant effects on Cymbidium flowers flowering and the number of single-branch. (3) In the process of bud differentiation of Cymbidium, ZT and GA3 content increased and then decreased; ABA had a slow rise; IAA decreased. The increase of ZT/IAA and ABA/IAA boosted bud differentiation.