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Related Experiment Video

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Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

Published on: September 11, 2016

Microbe-mediated local adaptation to limestone barrens is context dependent.

Renee H Petipas^1,2, Amy C Wruck¹, Monica A Geber¹

¹Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, 14853, USA.

|May 5, 2020

Summary

Plant root microbes help St. John's wort adapt to local environments. Their impact varies with plant age and habitat, demonstrating microbe-mediated adaptation crucial for plant fitness.

Keywords:

Hypericum perforatum (St. John’s wort)alvar context dependency evolutionary ecology geographic mosaic limestone barrens local adaptation microbe-mediated adaptation

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Area of Science:

Ecology
Microbiology
Evolutionary Biology

Background:

Plant-root-associated microbes significantly influence plant traits and stress tolerance.
These microbes are hypothesized to be key drivers of plant local adaptation to diverse environments.

Purpose of the Study:

To investigate the role of root microbes in the local adaptation of Hypericum perforatum (St. John's wort).
To compare the effects of microbes on plant adaptation in stressful limestone barrens (alvars) versus neighboring old-fields.

Main Methods:

Factorial experiments were conducted to assess plant-microbe interactions.
Hypericum perforatum from alvar and old-field habitats were grown with their native or non-native microbial communities.

Main Results:

Alvar plants showed greater benefit from microbes during early life stages.
Microbial effects on plant fitness varied by life-history stage and habitat.
Alvar plants with alvar microbes outperformed old-field plants in the alvar habitat, indicating microbe-mediated local adaptation.

Conclusions:

Rhizosphere microbes are critical for plant fitness and influence local adaptation patterns.
The contribution of microbes to plant adaptation is contingent upon life-history stage and specific habitat conditions.