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The relationship between photosynthesis measured by C-14 incorporation and by uptake of inorganic carbon in unicellular algae
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0003-2133-6526
1984 (English)In: Journal of Experimental Marine Biology and Ecology, ISSN 0022-0981, E-ISSN 1879-1697, Vol. 81, no 3, 241-250 p.Article in journal (Refereed) Published
Abstract [en]

The traditional 14C method of estimating photosynthetic rates was compared with net photo-synthesis in two species of unicellular algae. Net photosynthesis was defined as the disappearance of inorganic carbon from the algal medium and was determined using a described infra-red gas analyser (IRGA) technique. For Amphidinium carterae Hulbert, the 14C method always led to lower calculated rates of photosynthesis than the IRGA technique. This difference was, on average, ≈100%. For Scenedesmusobliquus (Turpin) Kützing, the 14C method could lead to over-estimates, good agreement with, or underestimates of net photosynthesis. Although the under-estimates were only of the order of 15%, the over-estimates were in some cases > 100%. There is some indication that respiration rate is an important factor in the relationship between photosynthetic rates calculated by the two methods for this organism.

Place, publisher, year, edition, pages
1984. Vol. 81, no 3, 241-250 p.
Keyword [en]
14CO2 incorporation; phytoplankton; measurement of photosynthesis; infra-red gas analysis (IRGA)
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:umu:diva-46948DOI: 10.1016/0022-0981(84)90144-8ISI: A1984TV01900004OAI: diva2:441504
Available from: 2011-09-16 Created: 2011-09-16 Last updated: 2015-04-29Bibliographically approved

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Samuelsson, Göran
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)
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