Biochemical acclimation, stomatal limitation and precipitationpatterns underlie decreases in photosynthetic stimulation of soybean(Glycine max) at elevated [CO₂] and temperatures under fully open airfield conditions

Authors

David M. Rosenthala, Ohio UniversityFollow
Ursula M. Ruiz-Vera, University of Illinois at Urbana-Champaign
Matthew H. Siebers, University of Illinois at Urbana-Champaign
Sharon B. Gray, University of Illinois at Urbana-Champaign
Carl J. Bernacchi, University of Illinois at Urbana-Champaign, USDA Agricultural Research Service, Institute for Genomic Biology
Donald R. Ort, University of Illinois at Urbana-Champaign, USDA Agricultural Research Service, Institute for Genomic BiologyFollow

Date of this Version

2014

Citation

Plant Science 226 (2014) 136–146; http://dx.doi.org/10.1016/j.plantsci.2014.06.013

Comments

U.S. Government Work

Abstract

The net effect of elevated [CO₂] and temperature on photosynthetic acclimation and plant productivityis poorly resolved. We assessed the effects of canopy warming and fully open air [CO₂] enrichment on (1)the acclimation of two biochemical parameters that frequently limit photosynthesis (A), the maximumcarboxylation capacity of Rubisco (V_c,max) and the maximum potential linear electron flux through photo-system II (J_max), (2) the associated responses of leaf structural and chemical properties related to A, as wellas (3) the stomatal limitation (l) imposed on A, for soybean over two growing seasons in a conventionallymanaged agricultural field in Illinois, USA. Acclimation to elevated [CO₂] was consistent over two grow-ing seasons with respect to Vc,maxand Jmax. However, elevated temperature significantly decreased Jmaxcontributing to lower photosynthetic stimulation by elevated CO₂. Large seasonal differences in precipi-tation altered soil moisture availability modulating the complex effects of elevated temperature and CO₂ on biochemical and structural properties related to A. Elevated temperature also reduced the benefit ofelevated [CO₂] by eliminating decreases in stomatal limitation at elevated [CO₂]. These results highlightthe critical importance of considering multiple environmental factors (i.e. temperature, moisture, [CO₂])when trying to predict plant productivity in the context of climate change.