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Updated: Dec 23, 2025

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Do plant-microbe interactions support the Stress Gradient Hypothesis?

Aaron S David1, Khum B Thapa-Magar1, Eric S Menges2

  • 1Department of Biology, University of Miami, 1301 Memorial Drive, Coral Gables, 33146, Florida, USA.

Ecology
|April 22, 2020
PubMed
Summary
This summary is machine-generated.

Soil microbes can facilitate plant germination under stress, supporting the Stress Gradient Hypothesis (SGH). However, these beneficial microbial effects are life-history stage-dependent, impacting germination more than biomass.

Keywords:
Florida rosemary scrubStress Gradient Hypothesisfacilitationhabitat specializationplant-microbe interactionssoil microbessymbiosis

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Area of Science:

  • Ecology
  • Plant-Microbe Interactions
  • Environmental Stress Biology

Background:

  • The Stress Gradient Hypothesis (SGH) posits that facilitative plant interactions increase with environmental stress.
  • Microbes play a crucial role in mediating plant responses to stress, influencing plant performance.
  • Understanding plant-microbial interactions under stress is vital for predicting community dynamics.

Purpose of the Study:

  • To investigate whether plant-microbial interactions support the Stress Gradient Hypothesis (SGH) across a stress gradient.
  • To test if habitat specialization and germination frequency influence the support for SGH in plant-microbial interactions.
  • To determine the life-history stage dependency of microbial effects on plant germination and biomass.

Main Methods:

  • Factorial experiments were conducted with 12 plant species from Florida rosemary scrub.
  • Microbial presence was manipulated in soils collected along an elevational stress gradient.
  • Germination frequency and plant biomass were measured as indicators of plant performance.

Main Results:

  • Soil microbes facilitated germination for 5 of 12 species, with effects increasing along the stress gradient, supporting the SGH for germination.
  • Microbial facilitation of germination was observed in species with low germination rates.
  • Support for the SGH was not predicted by habitat specialization or germination frequency; biomass showed limited support for SGH.

Conclusions:

  • Plant-microbial interactions can support the Stress Gradient Hypothesis, particularly for germination, in stressful habitats.
  • Microbial facilitation of germination is a key mechanism benefiting plant species in high-stress environments.
  • The impact of microbes on plant performance is dependent on the life-history stage, with germination being more responsive than biomass.