Abstract
The leaf anatomy was investigated with respect to the arrangement of cells involved in photosynthesis. The full-grown leaf has one vascular bundle consisting mainly of phioem cells. In similarity to terrestrial C4 plants the vascular bundle is surrounded by mesophyll bundle sheath cells. However, in contrast to C4 plants, these cells do not contain chlorophyll or starch inCeratophyllum. The early products in photosynthesis (10 seconds14C labelling) were analyzed. Although no complete separation of all radioactivity in the plant extracts was reached, it was clear that malate was the major labelled component, indicating C4 activity in the plants. No light saturation could be proven inCeratophyllum in several stages of post-dormancy in a statistically significant way, although a tendency to light saturation was observed at intensities higher than 36 Wm−2. The photosynthetic activity was only slightly depressed by enhancement of the O2 concentration in the medium.
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