Journal of Experimental Botany, Vol 49, 583-591, Copyright © 1998 by Oxford University Press
D Sims, J Seemann and Y Luo
The rate and extent of leaf thickness and area development are important
determinants of whole plant photosynthetic capacity. The interactive
effects of photon flux density (PFD), nitrogen supply
and CO2 concentration on leaf expansion rate were measured as well as final
leaf size and thickness of soybean. Leaf thickness and final area were not
correlated with leaf relative expansion rate (RER)
suggesting that these parameters are controlled by different mechanisms and
that final leaf dimensions are determined by the duration rather than the
rate of leaf expansion. Carbohydrate supply did not explain the variation
in leaf RER since RER increased
with increasing CO2 concentration, but decreased with increasing
PFD. Leaf thickness and final area were related to
resource supply but not in a simple fashion. Both positive and negative
correlations between leaf thickness and carbohydrate and nitrogen
concentrations were obtained depending on the environmental variable
responsible for the variation. In contrast, there was a simple proportional
relationship between whole plant relative growth rate and a correlate of
leaf thickness (leaf water content per unit area), suggesting that leaf
thickness responds to the balanced supply of all resources, in the same
fashion as RGR, rather than to any individual
resource.Keywords: Anatomy, carbohydrates,
Glycine max, microscopy, water content.
ARTICLES
Elevated CO2 concentration has independent effects on expansion rates and thickness of soybean leaves across light and nitrogen gradients
Desert Research Institute, Reno, NV, USA; Department of Biochemistry, University of Nevada, Reno, NV 89506, USA; Corresponding author address: University of Nevada, Reno, NV 89506, USA; Fax: +1 702 784 1419; E-mail: dsims@maxey.dri.edu
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