Abstract
Distributions of assimilates at different times after assimilation of 14CO2 shortly after ear emergence of semidwarf spring wheat differing in leaf angle and row width were similar. The differences in leaf angle were obtained with a normal droopy cultivar and a mutant derived from it and characterized by erect upper leaves. Shortly after emergence, flag leaf laminae and spikes (especially glumes, paleas and lemmas) were the main photosynthesizing parts. Their position in the upper levels accounted for the little effect of canopy architecture on their relative importance for photosynthesis. Leaf sheaths and particularly flag leaf sheaths photo-synthesized as much as about one third of their corresponding lamina. Most of the residual radioactivity at maturity was in the grains.
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