Changes in 14CO2 absorption rates by the successive leaves in buckwheat and white mustard plants of various ages

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Abstract
The experiments with different-aged buckwheat (Fagopyrum esculentum Mnch.) and white mustard (Sinapis alba L.) plants showed that the sub-apical and middle leaves, before they had reached their approximate final sizes, had the highest rates of 14CO2 absorption. The intensity of this process decreases in each leaf with age of the plant. White mustard leaves showed a little higher absorption rate of 14CO2 than analogous leaves of buckwheat plants. In the investigated leaves no close relationship between the intensity of 14CO2 assimilation and chlorophyll a and b concentration was observed. Some possible reasons for the higher intensity of photosynthesis in the sub-apical leaves are discussed.

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