The Interaction of Endophytic Fungi and Different Phosphorus Levels on Growth of Rhynchostylis gigantea Seedlings

Purpose Our aim was to study regularity of mycorrhizal Rhynchostylis gigantea seedlings' nutrients.Method According to the three different beneficial endophytic fungus isolated from three wild plants of R. gigantea, Dendrobium sinense and cultivated Oncidium hybridum respectively and different phosphorus concentrations (0P, 1/8P, 1/4P and 1P) MS liquid fertilizer were inoculated against R. gigantea seedlings in substrate for symbiotic culture. The data included the plant growth, morphology, biomass and nutrient content, and compared the divergence.Results Phosphorus had different influences on the growth of R. gigantea that restrained the growth of the plant leaf width and plant height but promoted the growth of leaf length under low phosphorus condition. In correlation analysis, we also found a positive correlation between the leaf length and P level and the seedlings had significant promoting effect at 1/8P. The plant growth obviously promoted after the infection of beneficial endophytic fungi successfully. Compared with CK, Z and S, the treatment of inoculated with W had been significantly effect on the fresh and dry weight. The plant fresh weights of aboveground part and aboveground part of dry weight were 12.14 g and 0.91 g respectively which against CK was remarkable. The beneficial endophytic fungi had the obvious promoter action to plant's chlorophyll content and the accumulation of mineral elements. It was proved that W and 1/8 MS were good endophytic fungi and fertilizer to R. gigantea.Conclusion Interactions of endophytic fungi and phosphorus play a promoting role on the growth of R. gigantean seedlings by increased seedling's growth, biomass and the accumulation of mineral element nutrition.