RESUMO
OBJECTIVE: To provide the scientific basis for the application of mycorrhizal fungi in Dendrobium officinale artificial cultivation. METHODS: The dominant strain was screened in a planting base by using biomass as the index. The effects of initial inoculums and supplementary inoculation on the growth and the chemical composition of D. officinale were further investigated. RESULTS: Mycorrhizal fungi M2(Mycena sp.) was found to be the advantageous strain. After 16 months of growth, the stem dry weight(SDW) and plant dry weight(PDW) of the three M2-treatment groups were significantly higher than those of CK, and the SDW of group M(M2 initial inoculums of 1.0 g·clump-1) was the highest, which increased by 39.2% and 11.1% compared with CK and group L(M2 initial inoculums of 1.0 g·clump-1)(P<0.05), respectively. Furthermore, M2 had no effect on the chemical properties of stem polysaccharide, and could improve the contents of naringenin and bibenzyls in the stems. The supplementary inoculation of M2 enhanced the plant-growth-promoting effects of M2. The SDW of the supplementary group increased by 18.0%(P<0.05) compared with the non-supplementary group, while supplementary inoculation had a certain effect on the chemical properties of polysaccharide. CONCLUSION: Mycorrhizal fungus M2 has good application prospects for D. officinale artificial cultivation.