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Updated: Jul 3, 2026
Microscopy Techniques for Interpreting Fungal Colonization in Mycoheterotrophic Plants Tissues and Symbiotic Germination of Seeds
Published on: May 17, 2022
Thin PTFE-like membranes allow characterizing germination and mechanical penetration competence of pathogenic fungi
Stefan Küster1, Nancy Ludwig, Guido Willers
1Fraunhofer Institute for Mechanics of Materials, Polymer Applications, Biological Materials and Interfaces, Walter-Hülse-Strasse 1, D-06120 Halle (Saale), Germany.
Abstract:
Investigating the penetration behavior of pathogenic fungi often fails because natural substrata vary significantly with respect to morphological and microstructural properties. To establish in vitro penetration assays, reproducible production of thin membranes with defined properties such as thickness, mechanical and chemical stability, roughness and hydrophobicity is essential. In this paper we describe the fabrication and characterization of membranes mimicking plant surfaces with respect to hydrophobicity and report on penetration assays with plant pathogenic fungi known to exert enormous force during the infection process. In order to reach high hydrophobicity, polytetrafluoroethylene-like membranes were used. By varying membrane thickness, the penetration competence of different pathogens could be evaluated and quantified. In addition, a relationship between surface roughness in the nanometer scale and the germination rate has been observed.
Insights
Researchers developed artificial plant surfaces to study how pathogenic fungi penetrate plant tissues. These polytetrafluoroethylene-like membranes mimic natural hydrophobicity and allow for quantifiable penetration assays, revealing insights into fungal infection processes.
Area of Science:
- Plant pathology
- Materials science
- Mycology
Background:
- Studying pathogenic fungal penetration is challenging due to natural substrate variability.
- Reproducible in vitro assays require membranes with defined properties like thickness, stability, roughness, and hydrophobicity.
Purpose of the Study:
- To fabricate and characterize membranes that mimic plant surfaces for in vitro fungal penetration assays.
- To evaluate the penetration competence of plant pathogenic fungi on these artificial substrates.
Main Methods:
- Fabrication of polytetrafluoroethylene-like membranes with controlled hydrophobicity.
- Characterization of membrane properties including thickness, mechanical stability, and surface roughness.
- Conducting in vitro penetration assays with plant pathogenic fungi.
Main Results:
- Developed highly hydrophobic membranes mimicking plant surfaces.
- Quantified fungal penetration competence by varying membrane thickness.
- Observed a correlation between nanometer-scale surface roughness and fungal germination rate.
Conclusions:
- The fabricated membranes provide a reproducible platform for studying fungal penetration.
- Membrane thickness and surface roughness are critical factors influencing fungal infection dynamics.
- This approach advances in vitro studies of plant-pathogen interactions.
