| Summary: | <i>Dendrobium officinale</i> Kimura et Migo, a highly valued Chinese herbal medicine, is on the verge of extinction in the wild, and is not cultivated efficiently. In this study, we explored the possibility that orchid mycorrhizal fungi (OMF) might improve the growth and cultivation of <i>D. officinale</i>. <i>Serendipita</i> sp., <i>Tulasnella calospora</i> and <i>Tulasnella asymmetrica</i> isolated from three different orchids were co-cultured with sterile seedlings of <i>D. officinale</i>. The seedlings were found to stably coexist with fungi after 60 days of co-culture. The co-culture of <i>T. calospora</i> with plants upregulated the activity of antioxidant enzymes, stimulated the production of osmoregulatory substances and reduced electrical conductivity. Plants with <i>T. calospora</i> had longer roots (141.2%), thicker leaves (58.3%), increased root number (71.4%) and leaf number (11.1%), and increased weight (155.2%) and photosynthetic pigment content (99.6%), relative to controls. The content of total medicinal polysaccharides increased by 42.69 % due to the addition of <i>T. calospora</i>. <i>T. asymmetrica</i> was less effective, followed by <i>Serendipita</i> sp. When <i>T. calospora</i> established a symbiotic relationship with <i>D. officinale</i>, resistance indicators increased. The content of functional components was significantly increased. This study contributes to the protection and commercial reproduction of endangered orchid plants with mycorrhizal technology.
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