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Related Experiment Video

Updated: Jun 3, 2026

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores

Published on: March 26, 2019

Does a facultative mutualism limit species range expansion?

John Stanton-Geddes¹, Carolyn G Anderson

¹Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, St. Paul, MN 55108, USA. stant067@umn.edu

|March 8, 2011

Summary

Limited rhizobia availability beyond the northern range edge may restrict legume expansion. Inoculation benefited plant growth across all sites, suggesting rhizobia density, not quality, is key.

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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

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Last Updated: Jun 3, 2026

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores

Published on: March 26, 2019

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

Area of Science:

Ecology
Plant Biology
Microbiology

Background:

Mutualistic interactions with soil microbes, like rhizobia for legumes, are crucial for plant survival and expansion.
The availability and effectiveness of these mutualists can change geographically, potentially limiting a species' ability to colonize new areas.

Purpose of the Study:

To investigate if the availability and quality of rhizobia limit the range expansion of the legume Chamaecrista fasciculata.
To determine the impact of rhizobia inoculation on C. fasciculata growth at and beyond its range edge.

Main Methods:

Transplanted C. fasciculata seeds to sites within, at, and beyond its range edge.
Experimentally inoculated half the seeds with rhizobia and monitored nodulation and plant growth.
Isolated and cross-inoculated rhizobia in greenhouse experiments to assess regional differences in quality.

Main Results:

Seeds transplanted beyond the range edge showed lower nodulation rates without experimental inoculation.
Plant growth was enhanced by rhizobia inoculation across all tested sites.
Rhizobia from different regions (interior, edge, beyond edge) did not show significant differences in their impact on plant growth in greenhouse trials.

Conclusions:

Low densities of suitable rhizobia beyond the range edge may impede legume range expansion.
Rhizobia availability, rather than quality, appears to be a more significant limiting factor for C. fasciculata's expansion.
Conservation and restoration efforts may need to consider microbial mutualist availability when facilitating plant range shifts.