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Soil water deficits decrease the internal conductance to CO2 transfer but atmospheric water deficits do not.

C R Warren1

  • 1School of Biological Sciences, Heydon-Laurence Building A08, The University of Sydney, Sydney NSW 2006, Australia. charles.warren@bio.usyd.edu.au

Journal of Experimental Botany
|February 2, 2008
PubMed
Summary
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Soil water deficits reduce internal conductance to CO2 in plants, impacting photosynthesis. However, increased vapor pressure deficit (VPD) does not affect internal conductance, suggesting different water stress responses.

Area of Science:

  • Plant physiology
  • Photosynthesis research
  • Plant water relations

Background:

  • Internal conductance to CO2 is a key factor limiting photosynthesis.
  • Soil water deficits are known to reduce internal conductance.
  • The effect of atmospheric water deficits (vapor pressure deficit, VPD) on internal conductance is unknown.

Purpose of the Study:

  • To investigate how atmospheric and soil water deficits affect internal conductance.
  • To compare responses in Eucalyptus regnans, Solanum lycopersicum, and Phaseolus vulgaris.

Main Methods:

  • Internal conductance was measured using the variable J method.
  • Concurrent measurements of gas exchange and fluorescence were employed.
  • Responses were assessed under varying VPD and soil water conditions.

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Main Results:

  • Stomatal conductance decreased with increasing VPD, but internal conductance remained unaffected.
  • Soil water deficits reduced both stomatal and internal conductance in all species.
  • The proportionality between stomatal and internal conductance changes varied among species.

Conclusions:

  • Soil water deficits, but not atmospheric water deficits (VPD), impact internal conductance.
  • The distinct responses suggest differing physiological effects or root-shoot signaling pathways.
  • Understanding these differences is crucial for predicting plant responses to water stress.