Soil microbial diversity of Bletilla striata

Sandy loam and sandy clay soils differed significantly in their physicochemical properties as well as in the structure and composition of their microbial communities. The accumulation of secondary metabolites such as militarine in B. striata was significantly higher in sandy clay than in sandy loam soil. Conversely, B. striata grew better in sandy loam soil. Pot experiment results further confirmed that the accumulation of secondary metabolites such as militarine was higher in soil transplanted with loam microbiota than in soil transplanted with clay microbiota.

砂质壤土（sandy loam）与砂质黏土（sandy clay）两类土壤在理化性质及微生物群落结构与组成上均存在显著差异。白及（B. striata）体内米尔它林（militarine）等次生代谢产物的积累量，在砂质黏土土壤中显著高于砂质壤土。反之，白及在砂质壤土中生长状况更佳。盆栽试验结果进一步证实，接种壤土微生物群落的土壤中，米尔它林等次生代谢产物的积累量高于接种黏土微生物群落的土壤。