Resources of arbuscular mycorrhizal fungi in ginger rhizosphere soil of Baise,Guangxi

【Objective】 Symbiosis of arbuscular mycorrhizal(AM) fungi in the rhizosphere soil of ginger in Baise, Guangxi and ginger and the physical and chemical character differences in rhizosphere soil were investigated to provide reference for the exploration of effective strains which could promote the growth of ginger and control disease in Guangxi and the application of AM fungi in ginger production.【Method】 In July, 2020, soil samples and root samples were collected from five ginger rhizosphere soils in Baise, Guangxi. The physical and chemical properties of soil were determined, the mycorrhizal colonization rate and AM fungal spore density were determined. The morphological identification of AM fungal spores was carried out to study the colonization characteristics and species diversity of AM fungi.【Result】 There were obvious differences in soil physical and chemical properties between different points. Soil pH at different points was 4.95-6.37. Soil total nitrogen, available phosphorus, organic matter and exchangeable magnesium contents were 0.175%- 0.327%, 8.5-95.0 mg/kg, 25.1-40.0 g/kg and 0.51-3.61 cmol/kg, respectively. All ginger in different sampling sites were infected by AM fungi. The colonization rate of AM fungi on ginger was 3.23%-29.06%. A total of 13 species belonging to 8 genera of AM fungi were isolated and identified from the 5 sampling points, including 3 species of Acaulospora, 2 species of Glomus, 3 species of Rhizophagus, 1 species of Paraglomus and 4 species of unknown genera were identified in the soil samples. The dominant species Rhizophagus mosseae was distributed in the soil of five ginger sampling sites. The number of spores was 44-288 spores/20 g dry soil. The correlation analysis results showed that the colonization rate of AM fungi in roots was extremely significantly positively correlated with soil organic matter content(R=0.501, P<0.01), and soil spore density was significantly positively correlated with soil available phosphorus content(R=0.603, P<0.05).【Conclusion】 There are abundant AM fungal resources in rhizosphere soil of ginger at different sampling points, and the diversity of AM fungal species is different. The spore density of AM fungi in newly planted ginger plot is higher than that in continuous cropping ginger plot. Soil organic matter and available phosphorus content are the main soil factors affecting the composition and distribution of AM fungal community in rhizosphere soil of ginger.