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.
RESUMO
OBJECTIVE: To study the effect of mycorrhizal fungi on the growth and the main chemical composition accumulation of Dendrobium nobile seedlings. METHODS: Seedlings which inoculated mycorrhizal fungus MF23 grew for 18 months, and were sampled regularly. The stem height and the dry weight of plant organs were measured and the content of dendrobine and polysaccharide were determined to investigate the effect of MF23 on the plant growth and the main chemical composition accumulation of stem. RESULTS: After 18 months growth, the stem height and the dry weight of root, stem and leaf of inoculated seedlings were significantly higher than those of the control, increased by 25.34%, 29.28%, 34.64% and 47.12%, respectively. MF23 increased the highest amount of dendrobine and polysaccharide in stem and also prolonged the accumulation process of polysaccharide. After 12 months growth, the content of dendrobine in both the treatment and the control group reached the highest levels, which were 0.59% and 0.51%, respectively. The content of polysaccharide in the treatment and the control group reached the highest levels after 15 (20.05%) and 12 (17.89%) months growth, respectively. CONCLUSION: Mycorrhizal fungus MF23 significantly promotes the growth of D. nobile seedlings, and had a good application prospects on the cultivation and production of D. nobile.