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Negative Impact on Growth and Photosynthesis in the Green Alga Chlamydomonas reinhardtii in the Presence of the Estrogen 17alpha-Ethynylestradiol
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. Smart Lighting ERC, Rensselaer Polytechnic InstituteTroy, NY, United States.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2014 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, no 10, e109289- p.Article in journal (Refereed) Published
Abstract [en]

It is well known that estrogenic compounds affect development of fertilized eggs of many species of birds, fish and amphibians through disrupted activity of carbonic anhydrase (CA). The most potent activity comes from the most commonly occurring synthetic sterol, 17alpha-Ethynylestradiol (EE2). Less is known about the responses of aquatic phytoplankton to these compounds. Here we show for the first time that, in comparision to the control, the addition of 7 microM EE2 reduced the growth rate of the green alga Chlamydomonas reinhardtii by 68% for cells grown at high CO2. When cells were grown in ambient air (low Ci) with a fully activated carbon concentrating mechanism through the induction of CA activity, the growth rates were reduced by as much as 119%. A reduced growth rate could be observed at EE2 concentrations as low as 10 pM. This was accompanied by a reduced maximum capacity for electron transport in photosystem II as determined by a lower FV/FM for low Ci-grown cells, which indicates the involvement of CAH3, a CA specifically located in the thylakoid lumen involved in proton pumping across the thylakoid membranes. These results were in agreement with an observed reduction in the chloroplastic affinity for Ci as shown by a strong increase in the Michaelis-Menten K0.5 for HCO3-. In itself, a lowering of the growth rate of a green alga by addition of the sterol EE2 warrants further investigation into the potential environmental impact by the release of treated waste water.

Place, publisher, year, edition, pages
2014. Vol. 9, no 10, e109289- p.
National Category
Biological Sciences
URN: urn:nbn:se:miun:diva-23216DOI: 10.1371/journal.pone.0109289ISI: 000343210300042PubMedID: 25310092ScopusID: 2-s2.0-84907895409ISBN: 1932-6203 (Electronic) 1932-6203 (Linking)OAI: diva2:755622
Available from: 2014-10-15 Created: 2014-10-15 Last updated: 2016-10-24Bibliographically approved

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Publisher's full textPubMedScopusNegative impact on growth and photosynthesis in the green alga Chlamydomonas reinhardtii in the presence of the estrogen 17α-ethynylestradiol

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