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• W1963572018 abstract "Spatial and daily variation in photosynthetic water-use efficiency was examined in leaves of Betula pendula Roth with respect to distribution of hydraulic conductance within the crown, morphological properties of stomata, and water availability. Intrinsic water-use efficiency (An/gs) was determined from gas-exchange measurements performed both in situ in a natural forest stand and on detached shoots under laboratory conditions. In intact foliage, sun leaves demonstrated significantly higher (P < 0.001) An/gs than shade leaves, as photosynthesis in the lower canopy was chronically limited by low light availability. However, this difference reversed in the mid-day period under sufficient irradiance (I > 800 µmol m−2 s−1): An/gs averaged 28.8 and 24.0 µmol mol−1 (P < 0.01) for shade and sun leaves, respectively. This last finding coincided with the data obtained in laboratory conditions: under equivalent leaf water supply and light, An/gs in shade foliage was greater (P < 0.001) than in sun foliage across a wide range of irradiance. Thus, shade foliage of B. pendula is characterized by inherently higher An/gs than sun foliage, associated with more conservative stomatal behavior, and lower soil-to-leaf (KT) and leaf hydraulic conductances. Under unlimited light conditions, a within-crown trade-off between An/gs and KT becomes apparent. Differences in stomatal conductance between the detached shoots from sunlit and shaded canopy layers were largely attributable to the variation in stomatal morphology; significant relationships were established with characteristics combining stomatal size and density (relative stomatal surface, stomatal pore area index). Stomatal morphology is very likely involved in long-term adjustment of photosynthetic WUE." @default.
• W1963572018 created "2016-06-24" @default.
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• W1963572018 date "2009-09-30" @default.
• W1963572018 modified "2023-09-29" @default.
• W1963572018 title "Is distribution of hydraulic constraints within tree crowns reflected in photosynthetic water-use efficiency? An example of Betula pendula" @default.
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• W1963572018 doi "https://doi.org/10.1007/s11284-009-0641-2" @default.
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