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THE EFFECTS OF CADMIUM ON PHOTOSYNTHESIS OF PHASEOLUS-VULGARIS - A FLUORESCENCE ANALYSIS
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
1993 (English)In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 88, no 4, 626-630 p.Article in journal (Refereed) Published
Abstract [en]

Bean plants (Phaseolus vulgaris L. cv. Scarlett), germinated in darkness for 1 week, were transferred to light (200 mumol m-2 s-1) and cultivated for 1 week in a complete nutrient solution. After this period, cadmium ions in the form of CdSO4 were added at the concentrations of 0, 10, 20 and 50 muM. The effects of this metal on the properties of photosystem II photochemistry were studied by means of modulated fluorescence analysis. Steady state photochemical quenching, non-photochemical quenching and terminal fluorescence were determined in control and cadmium-treated plants. We postulate that, during short term exposure of plants to cadmium in the early stages of growth, the Calvin cycle reactions are more likely than photosystem II to be the primary target of the toxic influence of cadmium. The reduced demand for ATP and NADPH upon Calvin cycle inhibition causes a down-regulation of photosystem II photochemistry and of the yield of linear electron transport.

Place, publisher, year, edition, pages
1993. Vol. 88, no 4, 626-630 p.
Identifiers
URN: urn:nbn:se:umu:diva-46868DOI: 10.1034/j.1399-3054.1993.880414.xISI: A1993LW02900014OAI: oai:DiVA.org:umu-46868DiVA: diva2:455550
Available from: 2011-11-10 Created: 2011-09-16 Last updated: 2017-12-08

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Oquist, Gunnar

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