Distribution and infection situations of mycorrhizal fungi in 13 traditional Chinese medicines in Chongqing, China.

[Objective] The aim was to investigate the distribution and infection situations of VA mycorrhizal fungi in 13 traditional Chinese medicines produed in Chongqing City,China.[Method] Rhizosphere soils from 13 types of traditional Chinese medicinal materials were collected;and VA mycorrhizal fungi were isolated and identified.The infection situation was investigated as well.[Result] All the 13 types of traditional Chinese medicinal materials had spores of VA mycorrhizal fungi in the rhizosphere soil.7 types of VA mycorrhizal fungi were distributed in the rhizosphere soils of Scrophularia ningpoensis Hemsl,which were the most abundant.A.coreanu had the highest spore density of VA mycorrhizal fungi(118.5 per gram);while A.dahurica f.var.formosana showed the minimum spore density,which was 11.3 per gram.All the 13 traditional Chinese medicinal materials could be infected by VA mycorhiza;and the infection rate of Polygonatum odoratum(Mill.) Druce was the highest(82.29%).[Conclusion] There were abundant mycorrhizal fungi resources in 13 traditional Chinese medicinal materials produced in Chongqing;and the infection situation among different plant individuals differed a lot.