Abstract
Wheat plants (Triticum aestivum L. cv. Kolibri) treated with the photosynthesis inhibiting herbicide methabenzthiazuron (N-(benzothiazol-2-yl)-N,N′-dimethylurea) responded by a decreased chlorophyll a/b ratio and an increased proportion of grana to stroma lamellae. The concentration of soluble reducing sugars was simultaneously reduced, but the concentrations of soluble amino acids and soluble proteins were increased. These results are integrated into the results from earlier experiments with methabenzthiazuron treated wheat plants, and the correlations with the available evidence on chloroplast ultrastructure in photosynthetically inhibited and in shaded plants are discussed.
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