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Revisiting the cry-for-help hypothesis in plant-microbe interactions.

Courtney L Tharp1, Gordon F Custer2, Gabriel Castrillo3

  • 1Department of Plant Science and Huck Institutes of the Life Sciences, The Pennsylvania State University, PA, USA; One Health Microbiome Center, The Pennsylvania State University, University Park, PA, USA.

Trends in Plant Science
|August 23, 2025
PubMed
Summary

The cry-for-help hypothesis (CHH) oversimplifies plant-microbe interactions. This study revisits CHH limitations, advocating for a more nuanced understanding of rhizosphere ecology and beneficial microbial recruitment under stress.

Keywords:
abiotic stressexudatesmicrobial ecologymicrobial traitsrhizosphere

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Area of Science:

  • Plant-microbe interactions
  • Rhizosphere ecology
  • Microbial ecology

Background:

  • The cry-for-help hypothesis (CHH) is widely applied to explain how root exudates shape microbial communities.
  • CHH suggests plants signal distress via exudates to attract beneficial microbes.
  • This hypothesis is crucial for understanding plant stress responses and soil health.

Purpose of the Study:

  • To critically evaluate the common misconceptions and limitations of the cry-for-help hypothesis.
  • To advocate for a reassessment of the CHH in plant-microbe interaction studies.
  • To highlight the ecological complexities in the rhizosphere.

Main Methods:

  • Literature review and critical analysis of existing research on the CHH.
  • Exploration of theoretical frameworks for plant-microbe communication.
  • Synthesis of evidence challenging the simplistic view of CHH.

Main Results:

  • Identified significant limitations and oversimplifications in the current application of the CHH.
  • Highlighted that plant-microbe interactions are more complex than CHH suggests.
  • Demonstrated the need for alternative or refined models.

Conclusions:

  • The cry-for-help hypothesis requires re-evaluation to accurately reflect rhizosphere ecological dynamics.
  • A more comprehensive understanding of plant-microbe interactions under stress is needed.
  • Future research should focus on the intricate mechanisms of microbial recruitment and plant responses.