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Related Experiment Video

Updated: May 3, 2026

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM
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A system for measuring leaf gas exchange based on regulating vapour pressure difference.

W Agata1, Y Kawamitsu, S Hakoyama

  • 1Department of Agriculture, Faculty of Agriculture, Kyushu University, Hakozaki, 812, Fukuoka, Japan.

Photosynthesis Research
|January 21, 2014
PubMed
Summary

A new system precisely controls leaf to air vapor pressure difference for accurate plant gas exchange measurements. Regulating this difference enhances CO2 assimilation and leaf conductance in rice plants.

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Area of Science:

  • Plant Physiology
  • Environmental Science
  • Biophysics

Background:

  • Accurate measurement of leaf gas exchange is crucial for understanding plant responses to environmental conditions.
  • Leaf to air vapor pressure difference (VPD) significantly influences gas exchange processes like photosynthesis and transpiration.
  • Previous methods lacked precise control over VPD, potentially confounding experimental results.

Purpose of the Study:

  • To develop and validate a novel system for precisely regulating leaf to air vapor pressure difference (VPD) during leaf gas exchange measurements.
  • To investigate the impact of VPD regulation on photosynthetic parameters and stomatal conductance in plants.
  • To enhance the accuracy and reliability of gas exchange measurements under controlled environmental conditions.

Main Methods:

  • Development of an integrated system including an assimilation chamber, temperature controllers, mass flow controllers, dew point controllers, and a personal computer.
  • Simultaneous control of leaf temperature and relative humidity to regulate VPD during light-response curve measurements.
  • Feed-forward control of dew point temperature to manipulate VPD during temperature-response curve measurements.
  • Continuous monitoring of photosynthetic parameters and environmental conditions by the computer.

Main Results:

  • Regulated VPD led to increased net CO2 assimilation, transpiration, and leaf conductance in rice plants at high light intensities.
  • Under regulated VPD (12 mbar), the maximum rate and optimum temperature for CO2 assimilation in rice leaves increased by 5 μmolCO2 m(-2) s(-1) and 5°C, respectively.
  • Stomatal conductance was found to increase with leaf temperature under constant VPD conditions, confirming the system's ability to isolate VPD effects.

Conclusions:

  • The developed system enables accurate and intensive measurements of leaf gas exchange by precisely controlling leaf to air vapor pressure difference.
  • VPD regulation significantly impacts key physiological processes in plants, affecting assimilation rates and conductance.
  • This technology is valuable for studying inter- and intra-specific variations in plant gas exchange characteristics with high precision.