Structural characteristics and diversity of the rhizosphere bacterial communities of wild Fritillaria przewalskii Maxim. in the northeastern Tibetan Plateau

Summary

This field survey investigated rhizosphere bacterial communities in wild populations of Fritillaria przewalskii, a Chinese endemic medicinal plant, across the northeastern Tibetan Plateau. Using high-throughput 16S rRNA sequencing and multivariate statistical analysis, the authors found that soil physicochemical properties—particularly pH—were the primary drivers of bacterial community differences, with alkaline soils associated with lower carbon and nitrogen content and reduced medicinal bulb biomass. Specific bacterial genera (Pseudonocardia, Ohtaekwangia, Flavobacterium) were significantly correlated with plant biomass, suggesting potential roles in regulating plant growth and nutrient cycling in this high-altitude environment.

Regional applicability

The findings are of limited direct applicability to UK farming systems, as they concern a wild endemic medicinal plant in alpine Tibetan conditions. However, the methodological approach of linking rhizosphere microbiota to soil chemistry and plant phenotype may inform UK research on soil-plant-microbe interactions in marginal or specialty crop production.

Key measures

16S rRNA gene sequencing; bacterial community composition and diversity; co-occurrence network complexity; soil pH, C and N content; plant bulb biomass; relative abundance of dominant bacterial phyla and genera

Outcomes reported

The study characterised bacterial community composition and diversity in rhizosphere versus bulk soil across 12 wild F. przewalskii sites, and identified correlations between soil physicochemical properties, plant phenotypic characteristics, and bacterial community structure. Soil pH and specific bacterial genera were associated with bulb biomass of the medicinal plant.

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