NDLI: Is distribution of hydraulic constraints within tree crowns reflected in photosynthetic water-use efficiency? An example of Betula pendula

Content Provider	Springer Nature Link
Author	Sellin, Arne Eensalu, Eve Niglas, Aigar
Copyright Year	2009
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 (A $_{n}$/g $_{s}$) 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) A $_{n}$/g $_{s}$ 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$^{−1}$): A $_{n}$/g $_{s}$ 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, A $_{n}$/g $_{s}$ 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 A $_{n}$/g $_{s}$ than sun foliage, associated with more conservative stomatal behavior, and lower soil-to-leaf (K $_{T}$) and leaf hydraulic conductances. Under unlimited light conditions, a within-crown trade-off between A $_{n}$/g $_{s}$ and K $_{T}$ 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.
Starting Page	173
Ending Page	183
Page Count	11
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	25
Issue Number	1
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2009-09-30
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Betula pendula Hydraulic constraints Stomatal conductance Stomatal size Water-use efficiency Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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