Journal
PLANT SCIENCE
Volume 169, Issue 5, Pages 908-916Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2005.06.009
Keywords
acclimation; elevated CO2; elevated temperature; gas exchange; nitrogen; photosynthetic capacity; stomatal conductance
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The short and long-term responses of flag leaf stomatal conductance (g(s)) and rate of photosynthesis (An) to elevated CO2 (757 mu mol mol(-1)), 4 degrees C warmer temperatures and N supply were investigated in spring wheat (Triticum aestivum L. cv. Alcala) crops grown in two seasons in field conditions under temperature gradient tunnels in a Mediterranean environment. Plants grown at elevated CO2 had lower g, and An measured at 700 mu mol mol(-1) CO2 than ambient CO2-grown plants, indicating acclimatory responses to elevated CO2. N supply, which was lower in 2003 than 2002, reduced this acclimation in both years. Warmer temperatures at high nitrogen supply also decreased An acclimation. Acclimatory responses of An and g, were highly correlated. The analysis of the gs An relationship indicated that both parameters are probably linked and respond in parallel to elevated CO2 at ambient temperatures, but non-parallel responses were observed at above-ambient temperatures. (c) 2005 Elsevier Ireland Ltd. All rights reserved.
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