The effect of ultraviolet radiation on ultrastructure and photosynthesis in the red macroalgae Palmaria palmata and Odonthalia dentata from Arctic waters

Plant Biology
A HolzingerChristian Wiencke

Abstract

In radiation exposure experiments, the effects of mild artificial UV conditions (4.7 W m(-2) UV-A and 0.20 W m(-2) UV-B) plus PAR (25 - 30 micromol photons m(-2) s(-1)) on photosynthesis and ultrastructure of two red algal species from the Arctic have been investigated. While Palmaria palmata was collected from the upper sublittoral of the Kongsfjord (Spitsbergen, Norway), Odonthalia dentata represents a typical deepwater species at this high latitude. After 6 h and 24 h exposure to UV, chlorophyll fluorescence of photosystem II (PS II efficiency, F(v)/F(m)) was determined as an indicator for photosynthetic performance, and the relative electron transport rates in response to increasing photon fluence rates were recorded. In parallel, tissue samples were prepared for the transmission electron microscope (TEM). The presented data clearly demonstrate a significant influence of experimental UV on photosynthetic performance. Photochemical efficiency of PS II of both red algal species decreased to about one third of the initial value under UV. While the PI (photosynthesis-irradiance) curve parameter alpha (positive slope at limiting photon fluence rates) strongly decreased in both plants, the I(k) values (initial value of light-satu...Continue Reading

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Citations

Nov 17, 2012·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Zenilda L BouzonEder C Schmidt
Jul 20, 2010·Micron : the International Research and Review Journal for Microscopy·Nelso P NavarroEstela M Plastino
Aug 8, 2009·Micron : the International Research and Review Journal for Microscopy·Andreas HolzingerCornelius Lütz
Jun 6, 2015·Environmental Science and Pollution Research International·Luca PaoliStefano Loppi
Dec 27, 2005·Micron : the International Research and Review Journal for Microscopy·Andreas Holzinger, Cornelius Lütz
Mar 9, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·D-P HäderR C Worrest
Jun 7, 2018·Toxicology and Industrial Health·Avdulla J AlijaPeter M Eckl
Jul 30, 2020·The Science of the Total Environment·Ruihua DaiTingting Tang
Jul 15, 2009·Micron : the International Research and Review Journal for Microscopy·Eder Carlos SchmidtZenilda Laurita Bouzon
Aug 25, 2010·Micron : the International Research and Review Journal for Microscopy·Eder C SchmidtZenilda L Bouzon

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