Evaluation of the symbiotic ability of arbuscular mycorrhizal (AM) fungi in some medicinal plants grown in Vietnam. In addition, the effect of AM fungus on the growth of these medicinal plants was also investigated. One or two main strains of the AM fungi were identified, serving as a scientific basis for the preparation of symbiotic fungi for increasing productivity and quality of medicinal plants.

Theoretical results: The symbiotic of AM fungi on the medicinal plants (Ehretia asperula and Solanum procumben) was determined, but no symbiosis was detected in samples of Catharanthus roseus. The main AM fungus on the above medicinal plants was identified as Rhizophagus intradices species. After re- inoculating the fungus on the medicinal plants, results showed a significant effect of the fungi on the growth of medicinal plants (Ehretia asperula and Solanum procumben), when compared with the control plants without adding the fungi. The symbiosis of the fungi also enhance  the accumulation of polyphenols in biomass of the plants
Applied results: The obtained results of the study will serve as a scientific basis for the application of arbuscular mycorrhizas in medicinal gardens. Because the growing process of medicinal plants uses a lot of chemical fertilizers to boost the plant growth, but it reduces the concentraitonof medicinal substances. Therefore, the use of growth stimulants from microorganisms will limit the adverse factors of chemical fertilizers.

This is the first study on the arbuscualar mycorrhizal fungus on medicinal plants (Ehretia asperula and Solanum procumben) in Vietnam. The results showed a positive effect of symbiotic fungi on the growth as well as the accumulation of medicinal substances (polyphenols) in the biomass of the two above species.

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