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Defenses Against Pathogens and Herbivores

Defenses Against Pathogens and Herbivores

Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.

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Updated: Mar 15, 2026

Combining Clearing and Fluorescence Microscopy for Visualising Changes in Gene Expression and Physiological Responses to Plasmodiophora brassicae

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Picturing pathogen infection in plants.

Matilde Barón, Mónica Pineda, María Luisa Pérez-Bueno

Zeitschrift Fur Naturforschung. C, Journal of Biosciences

|September 15, 2016

Summary

Imaging techniques like chlorophyll fluorescence, multicolour fluorescence, and thermography help monitor plant stress from pathogens. These non-destructive tools aid in disease detection and precision agriculture for better crop management.

Area of Science:

Plant Pathology
Plant Physiology
Biophysics

Background:

Biotic stress significantly impacts host plants, necessitating advanced monitoring tools.
Understanding plant-pathogen interactions requires analyzing metabolic changes during pathogenesis.
Traditional methods for evaluating plant stress are often destructive or lack spatial resolution.

Purpose of the Study:

To review the application of chlorophyll fluorescence, multicolour fluorescence, and thermography imaging techniques in studying plant responses to viral, bacterial, and fungal infections.
To highlight the potential of these imaging methods for early disease detection and disease signature identification.
To discuss the utility of these techniques in precision agriculture and high-throughput plant phenotyping.

Main Methods:

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Chlorophyll fluorescence (Chl-F) imaging to assess photochemical processes and energy dissipation.
Multicolour fluorescence imaging (UV-induced blue and green fluorescence) to analyze secondary metabolism.
Thermography to visualize leaf transpiration and stomatal function.

Main Results:

Chl-F parameters serve as indicators of pathogenesis by reflecting changes in photosynthetic performance.
Multicolour fluorescence changes correlate with the upregulation of plant secondary metabolism and phenolic compounds involved in defense.
Thermography reveals transpiration patterns, emphasizing the role of stomata in plant immunity and pathogen detection.

Conclusions:

Parallel application of multiple imaging techniques can establish specific disease signatures for pathogens.
These imaging methods offer powerful, non-destructive tools for presymptomatic pathogen detection and precision agriculture.
The adaptability of these techniques from lab-scale to field remote sensing and high-throughput phenotyping enhances their practical utility in crop management.