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Related Experiment Videos

Estimating stomatal conductance with thermal imagery.

I Leinonen1, O M Grant, C P P Tagliavia

  • 1Division of Environmental and Applied Biology, University of Dundee, Scotland. i.leinonen@scri.sari.ac.uk

Plant, Cell & Environment
|August 11, 2006
PubMed
Summary

This study introduces three infrared thermography methods to estimate stomatal conductance (gs) in plants. A new approach using a dry reference leaf offers a robust, non-contact method for drought response studies.

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Area of Science:

  • Plant Physiology
  • Environmental Science
  • Agricultural Engineering

Background:

  • Drought stress significantly impacts plant water use and crop yield.
  • Traditional methods for measuring stomatal conductance (gs) can be time-consuming and invasive.
  • Infrared thermography (IRT) offers a non-contact approach to assess plant physiological status.

Purpose of the Study:

  • To develop and compare three novel IRT-based methods for directly estimating absolute stomatal conductance (gs).
  • To evaluate the accuracy and robustness of these methods against traditional porometry measurements.
  • To identify the most suitable IRT approach for field studies on plant drought responses.

Main Methods:

  • Proposed three extensions of thermal 'stress indices' for direct gs estimation using IRT.

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  • Utilized leaf temperature, air temperature, and boundary layer resistance as primary inputs.
  • Compared methods using field data from a Portuguese vineyard, analyzing errors and theoretical variability.

    • Main Results:

    • Thermal estimates of stomatal conductance showed errors comparable to porometer measurements.
    • Alternative methods using reference surfaces, particularly a dry reference leaf, demonstrated advantages over full energy balance.
    • Relative differences in stomatal conductance were sensitively detected, despite some subjectivity in absolute value estimation.

    Conclusions:

    • IRT provides a viable, non-contact method for estimating stomatal conductance in plants.
    • The dry reference leaf approach is recommended for its robustness and practicality in field conditions.
    • IRT is effective for detecting treatment differences in stomatal conductance, aiding drought stress research.