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Updated: Jun 28, 2026

Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
General trait relationships in stems: a study on the performance and interrelationships of several functional and
Christiane Wittmann1, Hardy Pfanz
1Department of Applied Botany, University of Duisburg-Essen, 45117 Essen, Germany. christiane.wittmann@uni-due.de
Abstract:
We addressed corticular photosynthesis, focusing on parameters of underlying dark and light reactions as well as structural differentiation. To unveil general stem traits and underlying principles that may be valid across several tree species, CO(2) exchange rates and chlorophyll-fluorescence parameters were measured in current-year to 3-year-old stems of five deciduous tree species (including climax and pioneer species). Across species, dark CO(2) efflux rates (R(d)) of stems exhibited a common regression relationship with photosynthetic rates (A) and light-adapted quantum efficiency of photosystem II (PSII) (Delta F/Fm'), a pattern analogous to leaf trait correlations. Furthermore, A and Delta F/Fm' were closely interrelated to each other. Consistent correlations of stem structure and function were also assessed among species. Changes in tissue structure during ageing significantly affected several stem functional parameters. Stem CO(2) efflux during the dark and corticular photosynthetic rates declined with increasing stem age as well as light-adapted quantum efficiency of PSII. Furthermore, a strong relationship between stem R(d) and peridermal PFD-transmittance (T) as well as between R(d) and total bark chlorophyll was evident. Consistent results were found for the relationships between corticular photosynthesis (or primary photosynthetic reactions like Delta F/Fm') and selected structural traits. The found correlation patterns among functional and/or structural traits of stems and their concordance with leaf trait relationships may aid in identifying underlying mechanisms and scaling relationships that link traits to plant and ecosystem function.
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