BVOC emissions, photosynthetic characteristics and changes in chloroplast ultrastructure of Platanus orientalis L. exposed to elevated CO2 and high temperature |
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Authors: | Violeta Velikova Tsonko Tsonev Mauro Centritto Miroslava Stefanova Francesco Loreto |
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Institution: | a Bulgarian Academy of Sciences, Institute of Plant Physiology, Acad. G. Bonchev, Bl. 21, 1113 Sofia, Bulgaria b US Department of Agriculture, Agricultural Research Center, Arid-Land Agricultural Research Center (USDA, ARS) Maricopa, AZ, USA c Consiglio Nazionale delle Ricerche, Istituto di Biologia Agroambientale e Forestale, 00016 Monterotondo Scalo (RM), Italy d Sofia University, Faculty of Biology, 1000 Sofia, Bulgaria e Bulgarian Academy of Sciences, Institute of Biophysics, 1113 Sofia, Bulgaria |
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Abstract: | To investigate the interactive effects of increasing CO2] and heat wave occurrence on isoprene (IE) and methanol (ME) emissions, Platanus orientalis was grown for one month in ambient (380 μmol mol−1) or elevated (800 μmol mol−1) CO2] and exposed to high temperature (HT) (38 °C/4 h). In pre-existing leaves, IE emissions were always higher but ME emissions lower as compared to newly-emerged leaves. They were both stimulated by HT. Elevated CO2] significantly reduced IE in both leaf types, whereas it increased ME in newly-emerged leaves only. In newly-emerged leaves, elevated CO2] decreased photosynthesis and altered the chloroplast ultrastructure and membrane integrity. These harmful effects were amplified by HT. HT did not cause any unfavorable effects in pre-existing leaves, which were characterized by inherently higher IE rates. We conclude that: (1) these results further prove the isoprene's putative thermo-protective role of membranes; (2) HT may likely outweigh the inhibitory effects of elevated CO2] on IE in the future. |
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Keywords: | Carbon dioxide Global climate change High temperature Isoprene emission Thermotolerance |
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