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PH-DEPENDENT CADMIUM TRANSPORT INHIBITS PHOTOSYNTHESIS IN THE CYANOBACTERIUM SYNECHOCYSTIS-AQUATILIS
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: 0000-0001-5900-7395
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1993 (English)In: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 33, no 2, 331-337 p.Article in journal (Refereed) Published
Abstract [en]

Short-term (5-120 sec) transport of cadmium (Cd-109) into cells of the unicellular cyanobacterium Synechocystis aquatilis was studied using a rapid filtration technique. The transport was strongly pH-dependent, occurring at pH 7, but not at pH 5.5, and was also observed in long-term (40 min) experiments. For this process the optimum pH was approximately 7.5; uptake was considerably reduced at lower pHs. The entrance of cadmium disturbed photosynthetic activity and related processes. At pH 7, cadmium (8.9 muM) decreased CO2 fixation by about 55%, inhibited carbonic anhydrase activity (completely in intact cells, by 65%, in cell-free extracts) and photosynthetic O2-evolution by about 50%. At pH 5.5 no effects were observed.

Place, publisher, year, edition, pages
1993. Vol. 33, no 2, 331-337 p.
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URN: urn:nbn:se:umu:diva-46913DOI: 10.1016/0098-8472(93)90079-UISI: A1993LA09400014OAI: oai:DiVA.org:umu-46913DiVA: diva2:447237
Available from: 2011-10-11 Created: 2011-09-16 Last updated: 2017-12-08

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Gardeström, PerSamuelsson, Göran

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