Journal
ENVIRONMENTAL POLLUTION
Volume 158, Issue 4, Pages 983-991Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.10.022
Keywords
Stomatal conductance; Maximum electron transport; Maximum carboxylation capacity; Gas exchange; Clonal differences; Populus tremuloides
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Photosynthetic acclimation under elevated carbon dioxide (CO2) and/or ozone (O-3) has been the topic of discussion in many papers recently. We examined whether or not aspen plants grown under elevated CO2 and/or O-3 will acclimate after 11 years of exposure at the Aspen Face site in Rhinelander, WI, USA. We studied diurnal patterns of instantaneous photosynthetic measurements as well as A/C-i measurements monthly during the 2004-2008 growing seasons. Our results suggest that the responses of two aspen clones differing in O-3 sensitivity showed no evidence of photosynthetic and stomatal acclimation under either elevated CO2, O-3 or CO2 + O-3. Both clones 42E and 271 did not show photosynthetic nor stomatal acclimation under elevated CO2 and O-3 after a decade of exposure. We found that the degree of increase or decrease in the photosynthesis and stomatal conductance varied significantly from day to day and from one season to another. Published by Elsevier Ltd.
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