Shifts in Rhizosphere Bacterial Community Composition and Predicted Functional Potential Associated with Impatiens parviflora Invasion in Temperate Forest.
Wiśniewski P, Maździarz M, Kwietniewska K, Krawczyk K
Invasive Species
That weedy, orange-flowered plant carpeting the shady corners of urban parks and woodland edges may be quietly starving the soil of the bacteria that break down leaf litter and recycle nitrogen, making it harder for native forest plants to recover even after the invader is removed.
Researchers looked at the tiny bacteria living in the soil around the roots of a fast-spreading invasive plant called small balsam in Polish forests. They found that the invaded soil had more types of bacteria overall, but the kinds normally in charge — the ones that break down dead leaves and recycle nutrients — were consistently fewer. This hints that the plant may be rewriting the underground rulebook in ways that favor its own spread.
Key Findings
Bacterial species richness was significantly higher in invaded soils, but overall diversity (Shannon and Simpson indices) did not change, meaning invasion mainly boosted rare, low-abundance bacteria rather than reshaping the dominant community.
No single bacterial group was significantly enriched in invaded plots, but dominant bacterial orders were uniformly depleted — an unusual pattern compared to most other invasive plants studied.
37 inferred metabolic functions were consistently less abundant in invaded soils, including nitrogen cycling and degradation of complex plant polymers like cellulose and lignin.
chevron_right Technical Summary
A small invasive plant called small balsam is reshaping the soil bacteria around its roots in European forests, suppressing communities involved in nutrient cycling and organic matter breakdown — changes that may help explain how it outcompetes native plants.
Abstract Preview
Impatiens parviflora is a widespread invasive plant in temperate European forests, yet its influence on rhizosphere microbial communities remains poorly understood. This study provides initial meta...
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Impatiens parviflora is a species of annual herbaceous plants in the family Balsaminaceae, native to some areas of Eurasia, naturalized elsewhere and found in damp shady places. Impatiens parviflora can grow in sandy, loamy, and clay soils and prefers moist soil. The name comes from the fact that...