Abstract
Abstract One representative species of each of the three photosynthetic pathways (C3, C4, CAM) were cultivated in growth chambers with high and low nitrogen nutrition level respectively once at 20°C day/13°C night temperature, once at 30°C day/13°C night. Leaf conductances and δ13C values of the leaves of each plant were determined. At 20°C day temperature the C3 species showed higher leaf conductance with low nitrogen nutrition level than with high nitrogen level, which is also reflected in a more negative δ13C value, whereas both C4 and CAM plants did not respond in this manner to nitrogen supply. An increase of day temperature to 30°C diminished the significant response of the C3 plant, while the response of C4 and CAM representatives to nitrogen nutrition did not change markedly.
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