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Related Experiment Videos

Lateral gas diffusion inside leaves.

Roland Pieruschka1, Ulrich Schurr, Siegfried Jahnke

  • 1Forschungszentrum Jülich GmbH, ICG III: Phytosphere, D-52425 Jülich, Germany.

Journal of Experimental Botany
|January 26, 2005
PubMed
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Lateral CO2 diffusion within leaves is significant, especially in homobaric types. This internal leaf gas conductance impacts gas exchange measurements and varies between leaf types.

Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Leaf Gas Exchange Dynamics

Background:

  • CO2 diffusion in leaves is typically viewed as vertical, from stomata to tissues.
  • Previous work highlighted CO2 leakage from leaf chambers affecting measurements.
  • Lateral diffusion within leaf intercellular air spaces may be underestimated.

Purpose of the Study:

  • To quantify lateral gas conductance within leaves.
  • To compare internal gas diffusion properties between homobaric and heterobaric leaves.
  • To assess the impact of lateral diffusion on gas exchange measurements.

Main Methods:

  • Utilized 'clamp-on' leaf chambers and measured CO2 leakage beyond gaskets.
  • Quantified lateral gas conductance (g(leaf,l)) over 6-8 mm distances.

Related Experiment Videos

  • Characterized leaf internal gas diffusion using gas conductivities (g*(leaf)).

    • Main Results:

    • Significant differences in lateral gas conductance were found between homobaric and heterobaric leaves.
    • In homobaric leaves, lateral conductance was 2-20% of vertical conductance.
    • Lateral gas conductivities in homobaric leaves (67-209 micromol m(-1) s(-1)) exceeded vertical values (15-78 micromol m(-1) s(-1)).

    Conclusions:

    • Lateral gas diffusion is a crucial factor in leaf internal transport.
    • Homobaric leaves exhibit higher lateral gas conductance than heterobaric leaves.
    • Experimentalists must consider lateral diffusion to improve gas exchange measurement accuracy.