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Plant function and evolutionary biology
RESEARCH ARTICLE

Leaf structural responses to pre-industrial, current and elevated atmospheric [CO2] and temperature affect leaf function in Eucalyptus sideroxylon

Renee A. Smith A , James D. Lewis A B C , Oula Ghannoum A and David T. Tissue A
+ Author Affiliations
- Author Affiliations

A University of Western Sydney, Hawkesbury Institute for the Environment, Richmond, NSW 2753, Australia.

B Fordham University, Louis Calder Center - Biological Field Station and Department of Biological Sciences, Armonk, NY 10504, USA.

C Corresponding author. Email: jdlewis@fordham.edu

Functional Plant Biology 39(4) 285-296 https://doi.org/10.1071/FP11238
Submitted: 28 May 2011  Accepted: 16 January 2012   Published: 20 March 2012

Abstract

Leaf structure and chemistry both play critical roles in regulating photosynthesis. Yet, a key unresolved issue in climate change research is the role of changes in leaf structure in photosynthetic responses to temperature and atmospheric CO2 concentration ([CO2]), ranging from pre-industrial to future levels. We examined the interactive effects of [CO2] (290, 400 and 650 μL L–1) and temperature (ambient, ambient +4°C) on leaf structural and chemical traits that regulate photosynthesis in Eucalyptus sideroxylon A.Cunn. ex Woolls. Rising [CO2] from pre-industrial to elevated levels increased light-saturated net photosynthetic rates (Asat), but reduced photosynthetic capacity (Amax). Changes in leaf N per unit area (Narea) and the number of palisade layers accounted for 56 and 14% of the variation in Amax, respectively, associated with changes in leaf mass per area. Elevated temperature increased stomatal frequency, but did not affect Amax. Further, rising [CO2] and temperature generally did not interactively affect leaf structure or function. These results suggest that leaf Narea and the number of palisade layers are the key chemical and structural factors regulating photosynthetic capacity of E. sideroxylon under rising [CO2], whereas the lack of photosynthetic responses to elevated temperature may reflect the limited effect of temperature on leaf structure and chemistry.

Additional keywords: leaf anatomy, leaf physiology, nitrogen, photosynthesis, pre-industrial [CO2], stomata, temperature.


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