**9. Conclusion**

The interaction of mycorrhizal fungi and MHB can promote plant growth, reduce the occurrence of soil-borne diseases, and improve the availability of nutrients in soil and plant absorption rate. Plant microorganisms encode more genes than the host plant itself and affect the growth, development, and health of plants through the cooperation and competition between microorganisms and plants. The number of fungi in mycorrhizal rhizosphere is large, indicating that the rhizosphere microenvironment is conducive to the growth and development of fungi. The differences in species composition reflected that mycorrhiza and its metabolites changed the growth environment of soil fungi. The differences in dominant species indicated that some fungi in mycorrhizal rhizosphere adapted to the environment of mycorrhizal rhizosphere and survived. Endophytic bacteria symbiotic AMF significantly promoted the increase of chlorophyll content and promoted the utilization of photosynthesis in host plants. Endophytic bacteria symbiotic AMF significantly increased chitinase activity and activity of phenylalanine ammonia-lyase (PAL) and promoted host plant resistance to disease stress. These endophytic fungi are host plant mycorrhizal fungi. The effect of AM fungi inoculation combined with appropriate agronomic measures on improving soil fertility, promoting plant growth, and increasing plant yield is greater than any single effect.
