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<p class="AralkYok1">The effects of elevated-CO<sub>2</sub> and UVR on photosynthetic performance and nitrate reductase activity of <em>Ulva flexuosa </em>Wulfen 1803</p>

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Title Statement <p class="AralkYok1">The effects of elevated-CO<sub>2</sub> and UVR on photosynthetic performance and nitrate reductase activity of <em>Ulva flexuosa </em>Wulfen 1803</p>
 
Added Entry - Uncontrolled Name Yildiz, G
This study supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) Grants no 113Y071.
 
Uncontrolled Index Term Carbonic anhydrase, Chlorophyll fluorescence, Nitrate reductase, Ocean acidification
 
Summary, etc. <p class="AralkYok1" style="text-align: justify;">After the industrial revolution, increasing anthropogenic CO<sub>2</sub> emission causes a number of changes in seawater. These changes are known as ocean acidification and affect the seaweeds in various ways. Therefore, this study is aimed to determine the ecological succession of <em>Ulva flexuosa</em> Wulfen 1803<strong> </strong>in future predicted CO<sub>2</sub>-induced low pH conditions alone and in combination with naturally relevant ultraviolet radiation (UVR). For this purpose, acidification experiments with and without UVR were conducted on <em>U. flexuosa</em> from the Mediterranean coast, and important physiological features of algae was investigated. In this study, the Fv/Fm ratios of <em>U. flexuosa</em> ranged from 0.718±0.01 to 0.754±0.009. While rETRmax values of samples exposed to elevated-CO<sub>2</sub> were measured between 112.13 – 151.93 µmol e<sup>-</sup>m<sup>-2</sup>s<sup>-1</sup>, it was determined between 111.7 – 158.4 µmol e<sup>-</sup>m<sup>-2</sup>s<sup>-1 </sup>in samples exposed to ambient sea water. According to our results, increased CO<sub>2</sub> concentration in seawater did not improve the photosynthetic efficiency of <em>U. flexuosa</em>. However, when the specimens were exposed to elevated-CO<sub>2</sub>, nitrate reductase activity of <em>U. flexuosa</em> was declined drastically. According to the results, it is suggested that the elevated CO<sub>2</sub> may regulate the nitrogen preference of <em>U. flexuosa</em>. Besides, the data also show that <em>U. flexuosa</em> was not sensitive to UVR.</p><p class="AralkYok1" style="text-align: justify;"> </p>
 
Publication, Distribution, Etc. Indian Journal of Geo-Marine Sciences (IJMS)
2022-09-30 00:37:52
 
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http://op.niscair.res.in/index.php/IJMS/article/view/32971
 
Data Source Entry Indian Journal of Geo-Marine Sciences (IJMS); ##issue.vol## 50, ##issue.no## 04 (2021)
 
Language Note en