title: [Study on correlations between total saponins content in rhizome or mycorrhizal infection rate of Pairs polyphylla var. yunnanensis and soil factors].
abstract: OBJECTIVE
  Through correlation and path analysis between total saponins content in rhizome/mycorrhizal infection rate in roots of Pairs polyphylla var. yunnanensis and soil factors, to make an inquiry into the role of soil factors in the quality formation of P. polyphylla var. yunnanensis.
  
  
  METHODS
  Tested total saponins in rhizome, mycorrhizal fungal infection rate in root and physical and chemical properties in rhizosphere soil in 25 different growth areas, and statistically analyzed the relationship between total saponins in rhizome/mycorrhizal infection rate in roots of P. polyphylla var. yunnanensis and soil factors by using correlation and path analysis.
  
  
  RESULTS
  The symbiosis relationship between AM mycorrhizal and roots of P. polyphylla var. yunnanensis were better established under natural condition, of which the infection ratio between 36.41%, 83.37%. There were significantly positive correlation between total saponins content in rhizome and urease activity or alkaline phosphatase activities or organic matter in soil, but there was significantly negative correlation between total saponins content and bulk density. There was significantly positive correlation between AM infection ratio and alkaline nitrogen. Path analysis indicated that total saponins of rhizome mainly affected by alkaline nitrogen in soil rhizosphere, secondly by soil organic matter and soil urease activity. While the mycorrhizal fungal colonization ratio was mainly affected by soil pH, secondly by alkaline nitrogen, urease activity, and available phospherus in soil.
  
  
  CONCLUSIONS
  There is closed relationship between quality formation of P. polyphylla var. yunnanensis and soil factors. Path analysis is better for reflecting the contribution of soil factors to total saponins and mycorrhizal infection ratio.
authors.affiliation: College of Resource and Environment, Yunnan Agricultural University, Kunming 650201, China.
authors.forename: Yantao
authors.initials: Y
authors.lastname: Duan
authors.forename: Zhongjun
authors.initials: Z
authors.lastname: He
authors.forename: Shewang
authors.initials: S
authors.lastname: Liang
authors.forename: Yin
authors.initials: Y
authors.lastname: Wang
authors.forename: Junfen
authors.initials: J
authors.lastname: Xiong
authors.forename: Fangdong
authors.initials: F
authors.lastname: Zhan
authors.forename: Rui
authors.initials: R
authors.lastname: Zeng
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D019668:Liliaceae / Q000737:chemistry* / Q000382:microbiology*; D038821:Mycorrhizae / Q000254:growth & development*; D027343:Rhizome / Q000737:chemistry*; D012503:Saponins / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014510:Urease / Q000378:metabolism
chemical_list: D012503:Saponins; D012987:Soil; D000469:Alkaline Phosphatase; D014510:Urease