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Relating Stomatal Conductance to Leaf Functional Traits
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An integrated model of stomatal development and leaf physiology.

Graham J Dow1, Dominique C Bergmann1,2, Joseph A Berry3

  • 1Department of Biology, Stanford University, 371 Serra Mall, Stanford, CA, 94305, USA.

The New Phytologist
|November 21, 2013
PubMed
Summary

Plant stomatal size and number (Anatomical g(smax)) accurately predict operational stomatal conductance (g(s)). This finding links plant anatomy to gas exchange, aiding predictions in changing CO₂ environments.

Keywords:
Arabidopsis thalianaBall-Woodrow-BerryCO2 responsesclimate changeg smaxmodelstomatal conductancestomatal development

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Area of Science:

  • Plant Physiology
  • Plant Anatomy
  • Ecology

Background:

  • Stomatal conductance (g(s)) is crucial for plant gas exchange.
  • Maximum stomatal conductance (Anatomical g(smax)) is determined by stomatal traits.
  • The link between Anatomical g(smax) and operational g(s) is not well understood.

Purpose of the Study:

  • To investigate the relationship between Anatomical g(smax) and operational g(s).
  • To determine if Anatomical g(smax) can predict operational g(s) under various atmospheric conditions.
  • To develop a model for estimating g(s) based on stomatal anatomy and environmental factors.

Main Methods:

  • Leaf-level gas-exchange measurements were conducted on six Arabidopsis thaliana genotypes.
  • Genotypes with varying Anatomical g(smax) were selected.
  • Measurements were performed under conditions maximizing stomatal opening (high light, low CO₂, high humidity).

Main Results:

  • Anatomical g(smax) accurately predicted operational g(s) under optimal conditions.
  • Scaled g(s) showed similar responses to increasing CO₂ across genotypes.
  • An empirical model predicting g(s) using Anatomical g(smax), humidity, and CO₂ was developed and validated.

Conclusions:

  • A direct link exists between stomatal development (anatomy) and leaf physiology (gas exchange).
  • Anatomical g(smax) can be used to predict operational g(s) across different CO₂ levels.
  • This research provides a tool to quantify plant gas flux in current and future CO₂ conditions.