Apparent photosynthesis of Potamogeton perfoliatus L. in different depths of Lake Balaton

Felföldy, Lajos (1960) Apparent photosynthesis of Potamogeton perfoliatus L. in different depths of Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 27. pp. 201-208. ISSN 0365-3005

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Abstract

Experiments were made in the apparent photosynthesis of Potamogeton perfoliatus L. The results may be summed up as- follows: 1. For photosynthetic experiments of short duration (only few hours) isolated leaves are more suitable than the apical portions of shoot. 2. As the calculations made on a dry matter, leaf surface or chlorophyll content basis show, the photosynthetic rate of the leaves of different plant specimens collected from natural habitats are very incongruous. Leaves of the same plant gave good and comparable results. The effect of various light intensities in different depths of water can be correctly measured by the relative measurement method of Meyer and co-workers (1941, 1943). 3. According to these studies, the photosynthetic activity of higher aquatic plants is never inhibited by lack of light on clear summer days, even if the water is very turbid. 4. Inhibition due to oversaturated light can be studied in the uppermost layers of optical clear water. 5. Compensation point of photosynthesis and of respiration can not develop in summer days in the shallow water of Lake Balaton.

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