The alien Acacia salicina invasive does not infiltrate the native soil rhizobial symbiosis networks
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View abstract on PubMed
Summary
This summary is machine-generated.Invasive Acacia salicina decreases soil health and forms unique partnerships with novel rhizobia, impacting native Lotus creticus symbionts. This invasion highlights complex plant-microbe interactions in ecosystem change.
Area Of Science
- Ecology
- Microbiology
- Plant-Microbe Interactions
Background
- Invasive species can disrupt native ecosystems by altering soil properties and microbial communities.
- Plant-microbe symbiosis, particularly with rhizobia, plays a crucial role in plant health and ecosystem function.
- Understanding the interaction networks between invasive plants, native plants, and their microbial symbionts is vital for predicting invasion success and ecological impact.
Purpose Of The Study
- To investigate the impact of invasive *Acacia salicina* on soil microbial biomass, respiration, and enzymatic activities.
- To identify the rhizobial symbionts associated with both invasive *A. salicina* and native *Lotus creticus*.
- To analyze the modularity and specialization of the interaction networks between *L. creticus*, *A. salicina*, and their respective rhizobia.
Main Methods
- Soil microbial biomass, basal respiration, and enzymatic activities were measured to assess soil health changes.
- Housekeeping gene-based phylogeny and *nodC* gene analysis were used to identify and characterize rhizobial symbionts.
- Network analysis, including modularity and specialization indexes, was applied to study plant-rhizobia interaction networks.
Main Results
- *Acacia salicina* invasion led to decreased soil microbial biomass, basal respiration, and enzymatic activities.
- Invasive *A. salicina* exclusively associated with a novel *Paraburkholderia* sp., while *L. creticus* associated with novel lineages of *Rhizobium*, *Allomesorhizobium*, and *Mesorhizobium*.
- Interaction networks were highly modular and specialized, with distinct symbiovars identified for each plant-legume symbiont pair. Network topology remained stable despite invasion, but native rhizobia composition changed significantly.
Conclusions
- The invasion of *A. salicina* negatively impacts soil health and establishes unique rhizobial partnerships.
- The distinct and non-overlapping interaction networks between invasive and native species suggest that co-invasion of plant and rhizobia is critical for successful plant invasion.
- These findings highlight the complex co-evolutionary dynamics and ecological consequences of plant invasions mediated by symbiotic relationships.
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