The Péclet effect on leaf water enrichment correlates with leaf hydraulic conductance and mesophyll conductance for CO2

Authors

  • JUAN PEDRO FERRIO,

    Corresponding author
    1. Department of Crop and Forest Science, Universitat de Lleida, E-25198, Lleida, Spain
    2. Institute of Forest Botany and Tree Physiology, University of Freiburg, D-79110, Freiburg im Breisgau, Germany
    Search for more papers by this author
    • JPF and AP contributed equally to this work.

  • ALÍCIA POU,

    1. Plant Physiology Lab, Department of Biology, Universitat de les Illes Balears, E-07122, Palma de Mallorca, Spain
    Search for more papers by this author
    • JPF and AP contributed equally to this work.

  • IGOR FLOREZ-SARASA,

    1. Plant Physiology Lab, Department of Biology, Universitat de les Illes Balears, E-07122, Palma de Mallorca, Spain
    Search for more papers by this author
  • ARTHUR GESSLER,

    1. Institute for Landscape Biogeochemistry, Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e.V., D-15374 Müncheberg, Germany
    Search for more papers by this author
  • NAOMI KODAMA,

    1. Agro-meterology Division, National Institute for Agro-Environmental Sciences (NIAES), 305-8604, Tsukuba, Japan
    Search for more papers by this author
  • JAUME FLEXAS,

    1. Plant Physiology Lab, Department of Biology, Universitat de les Illes Balears, E-07122, Palma de Mallorca, Spain
    Search for more papers by this author
  • MIQUEL RIBAS-CARBÓ

    1. Plant Physiology Lab, Department of Biology, Universitat de les Illes Balears, E-07122, Palma de Mallorca, Spain
    Search for more papers by this author

J. P. Ferrio. Fax: +34 973 702924; e-mail: pitter.ferrio@pvcf.udl.cat

ABSTRACT

Leaf water gets isotopically enriched through transpiration, and diffusion of enriched water through the leaf depends on transpiration flow and the effective path length (L). The aim of this work was to relate L with physiological variables likely to respond to similar processes. We studied the response to drought and vein severing of leaf lamina hydraulic conductance (Klamina), mesophyll conductance for CO2 (gm) and leaf water isotope enrichment in Vitis vinifera L cv. Grenache. We hypothesized that restrictions in water pathways would reduce Klamina and increase L. As a secondary hypothesis, we proposed that, given the common pathways for water and CO2 involved, a similar response should be found in gm. Our results showed that L was strongly related to mesophyll variables, such as Klamina or gm across experimental drought and vein-cutting treatments, showing stronger relationships than with variables included as input parameters for the models, such as transpiration. Our findings were further supported by a literature survey showing a close link between L and leaf hydraulic conductance (Kleaf = 31.5 × L−0.43, r2 = 0.60, n = 24). The strong correlation found between L, Klamina and gm supports the idea that water and CO2 share an important part of their diffusion pathways through the mesophyll.

Ancillary