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Relating Stomatal Conductance to Leaf Functional Traits
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Stomatal conductance increases with rising temperature.

Josef Urban1,2, Miles Ingwers3, Mary Anne McGuire4

  • 1a Department of Forest Botany, Dendrology and Geobiocenology , Mendel University in Brno , Czech Republic.

Plant Signaling & Behavior
|August 9, 2017
PubMed
Summary
This summary is machine-generated.

Rising temperatures cause stomatal conductance to increase in plants, enhancing cooling and photosynthesis. However, this response may accelerate soil water depletion, impacting plant survival during climate change.

Keywords:
Ball-Berry modelelevated temperatureevaporative coolingglobal changeheat wavesphotosynthesisstomatal conductance

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Area of Science:

  • Plant physiology
  • Environmental science
  • Climate change biology

Background:

  • Stomatal conductance is crucial for plant water relations and photosynthesis.
  • Temperature's impact on stomatal conductance is understudied despite its rapid change and rising global trends.
  • Understanding temperature effects on stomata is vital for predicting plant responses to climate change.

Purpose of the Study:

  • To investigate the direct effect of increasing temperature on stomatal conductance in plants.
  • To elucidate the underlying mechanisms of temperature-induced stomatal opening.
  • To assess the implications of altered stomatal conductance for plant water use and photosynthesis under warming conditions.

Main Methods:

  • Measurements of stomatal conductance in poplar and loblolly pine across a temperature gradient (30°C to 40°C) at a constant vapor pressure deficit (1 kPa).
  • Analysis of plant water status (leaf water potential), transpiration rates, intercellular CO2 concentrations, and photosynthetic rates.
  • Evaluation of potential contributions from hydraulic conductance changes and water viscosity.

Main Results:

  • Stomatal conductance significantly increased by approximately 40% with a 10°C rise in temperature in both broadleaf and coniferous species.
  • The temperature response of stomatal conductance was partly independent of water status and carbon metabolism.
  • Stomatal conductance increased despite decreased leaf water potential and increased intercellular CO2, suggesting a direct thermal response possibly linked to hydraulic conductance.

Conclusions:

  • Plants exhibit a direct stomatal opening response to increasing temperatures, potentially aiding evaporative cooling and photosynthesis during heatwaves.
  • This temperature-driven stomatal response may lead to increased soil water depletion, posing a risk of drought stress.
  • The findings highlight a critical, yet underappreciated, plant adaptation mechanism to rising global temperatures.