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Arbuscular mycorrhiza fungi (AMFs) are a group of soil-dwelling fungi that form symbiotic associations with plants, to mediate the secondary metabolism and production of active ingredients in aromatic and medicinal plants. Currently, there is little research on  Salvia miltiorrhiza  Bge. inoculation with native AMFs and the concomitant effects on growth and secondary metabolites. In this study,  S. miltiorrhiza  was treated with eight AMFs, i.e.,  Glomus formosanum ;  Gl. tenebrosum ;  Septoglomus constrictum ;  Funneliformis geosporum ;  Rhizophagus manihotis ;  Ambispora gerdemanii ;  Acaulospora laevis ;  Ac. tuberculata , to investigate the influence of AMF inoculation on biomass and secondary production under greenhouse conditions in  S. miltiorrhiza  roots. The results showed that mycorrhiza formation rates were between 54.83 and 86.10%. Apart from  Ac. laevis  and  Gl. tenebrosum  treatment, the roots biomass of the other treatment groups was effectively increased, and the fresh and dry weight of the plant inoculated with  Fu. geosporum  were increased by 86.76 and 86.95%, respectively. Specifically, AMF treatments also impacted on phenolic acids production; inoculation with both  Fu. geosporum  or  Ac. laevis  significantly reduced total phenolic acids, whereas the other treatments effectively increased these levels, of which  Gl. formosanum  generated significant levels. Most AMF-plant symbiotic experiments facilitated phenolic acid accumulation in the secondary metabolites of  S. miltiorrhiza  (except  Ac. laevis ). This study showed that most native AMFs inoculation with  S. miltiorrhiza  promoted roots growth and increased secondary metabolites production (especially phenolic acids). Going forward, inoculation of native AMF is a promising method to improve the quality and yield of  S. miltiorrhiza  and should be considered during production.

Effects of Native Arbuscular Mycorrhizae Isolated on Root Biomass and Secondary Metabolites of Salvia miltiorrhiza Bge