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JXB Advance Access published online on January 24, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri072
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Journal of Experimental Botany © Society for Experimental Biology 2005; all rights reserved
Received June 2, 2004
Accepted November 2, 2004

RESEARCH PAPER

Lateral gas diffusion inside leaves

Roland Pieruschka 1, Ulrich Schurr 1, and Siegfried Jahnke 2*

1 Forschungszentrum Jülich GmbH, ICG III: Phytosphere, D-52425 Jülich, Germany
2 Forschungszentrum Jülich GmbH, ICG III: Phytosphere, D-52425 Jülich, Germany; FB 9-Botanik, Universität Duisburg-Essen, D-45117 Essen, Germany

* To whom correspondence should be addressed.
Siegfried Jahnke, E-mail: s.jahnke{at}fz-juelich.de


  Abstract

Diffusion of CO2 inside leaves is generally regarded to be from the substomatal cavities to the assimilating tissues, i.e. in the vertical direction of the leaf blades. However, lateral gas diffusion within intercellular air spaces may be much more effective than hitherto considered. In a previous work it was demonstrated that, when ‘clamp-on’ leaf chambers are used, leaf internal ‘CO2 leakage’ beyond the leaf chamber gaskets may seriously affect gas exchange measurement. This effect has been used in the present paper to quantify gas conductance (gleaf,l, mmol m-2 s-1) in the lateral directions within leaves and significant differences between homo- and heterobaric leaves were observed. For the homobaric leaves, lateral gas conductance measured over a distance of 6 or 8 mm (the widths of the chamber gaskets) was 2-20% of vertical conductance taken from published data measured over much smaller distances of 108-280 µm (the thickness of the leaves). The specific internal gas diffusion properties of the leaves have been characterized by gas conductivities (gleaf*, µmol m-1 s-1). Gas conductivities in the lateral directions of heterobaric leaves were found to be small but not zero. In homobaric leaves, they were between 67 and 209 µmol m-1 s-1 and thus even larger than those in the vertical direction of the leaf blades (between 15 and 78 µmol m-1 s-1). The potential implications for experimentalists performing gas exchange measurements are discussed.

Keywords: Gas conductance; gas conductivity; gas exchange measurement; heterobaric leaf anatomy; homobaric leaf anatomy; respiration.
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