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Antitranspirant functions of stem periderms and their influence on corticular photosynthesis under drought stress

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Abstract

Transpiration and photosynthesis of current-year stems and adult leaves of different deciduous tree species were investigated to estimate their probable influence on carbon balance. Peridermal transpiration of young stems was found to be rather small as compared to the transpiration of leaves (stem/leaf like 1/5–1/20). A characteristic that was mainly attributable to the lower peridermal conductance to water and CO2, which made up only 8–28% of stomatal conductance. Water vapour conductance was significantly lower in stems, but also non-responsive to PAR, which led to a comparatively higher water use efficiency (WUE, ratio assimilation/transpiration). Thus, although corticular photosynthesis reached only 11–37% of leaf photosynthesis, it may be a means of improving the carbon balance of stems under limited water availability. The influence of drought stress on primary photosynthetic reactions was also studied. Under simulated drought conditions the drying time needed to provoke a 50% reduction (t 50) in dark- and light-adapted PSII efficiency (Fv/Fm, ΔF/Fm′) was up to ten times higher in stems than in leaves. Nevertheless, up to a relative water deficit (RWD) of around 40–50% dark-adapted PSII efficiency of leaves and stems was rather insensitive to dehydration, showing that the efficiency of open PS II reaction centres is not impaired. Thus, it may be concluded that in stems as well as in leaves the primary site of drought damage is at the level of dark enzyme reactions and not within PSII. However, enduring severe drought caused photoinhibitory damage to the photosynthetic apparatus of leaves and stems; thereby RWD50 values (= RWD needed to provoke a 50% reduction in Fv/Fm ad ΔF/Fm′) were comparably lower in stems as compared to leaves, indicating a possibly higher drought sensitivity of the cortex chlorenchyma.

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Acknowledgments

We would like to thank Gudrun Friesewinkel, Sabine Kühr and Christa Kosch for technical assistance. Warm thanks also to Dipl. Umweltwiss. Sabine Flohr.

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  1. Institut für Angewandte Botanik, Universität Duisburg-Essen, Universitätsstr. 5, 45117, Essen, Germany

    Christiane Wittmann & Hardy Pfanz

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  1. Christiane Wittmann
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  2. Hardy Pfanz
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Correspondence to Hardy Pfanz.

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Communicated by H. Pfanz.

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Wittmann, C., Pfanz, H. Antitranspirant functions of stem periderms and their influence on corticular photosynthesis under drought stress. Trees 22, 187–196 (2008). https://doi.org/10.1007/s00468-007-0194-3

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  • DOI: https://doi.org/10.1007/s00468-007-0194-3

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