Message - 7th IAL Symposium

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Lichen: from genome to ecosystem in a changing world 4B-P (4B-P9) Submission ID: <strong>IAL</strong>0292-00001 BLUE LIGHT SCREENING REDUCE BLUE LIGHT PHOTOSYNTHETIC EFFICIENCY OF CYANOLICHENS COMPARED WITH CHLOROLICHENS Xie L. 1 , Solhaug K. 1 1 Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway Cyanolichens have phycocyanins that mainly absorb light in the green part of the spectrum. Thereby, phycocyanins enhance the absorption of light transmitted through a canopy. The combination of phycocyanins and chl a may thus improve photosynthesis in shaded forest sites. We compared the chlorolichens Lobaria pulmonaria and Peltigera leucophlebia with the cyanolichens L. hallii and P. praetextata by measuring light response curves for photosynthetic CO 2 uptake, O 2 evolution, as well as photosystem II efficiency in blue, green and red light, respectively. Maximal photosynthetic CO 2 uptake was slightly higher for both cyanolichens than for the chlorolichens in green light. In red light there was no difference in maximal CO 2 uptake, whereas both cyanolichens had substantially lower photosynthesis in blue light. The same trend occurred for photosynthetic O 2 evolution. Apparent electron transport rate (ETR) did not differ between red and green light in any of the species. For the cyanolichens, ETR showed no sign of light saturation in blue light, indicating that little blue light absorbed is used in photosynthesis. Reflectance spectra showed that green light was less reflected in the cyanolichens, which may partly explain the slightly higher cyanobacterial photosynthetic CO 2 uptake in green light. However, low reflectance of blue light for all lichens cannot explain the reduced photosynthesis in cyanolichens in blue light. Transmittance of light through the combined cortex and photobiont layer showed that also the blue light was efficiently absorbed. Screening was estimated indirectly by comparing chlorophyll fluorescence ratios between chlorophyll fluorescence excited with blue and red light. Much lower blue/red ratios occurred in the cyanolichens L. hallii and P. praetextata than in the chlorolichens L. pulmonaria and P. leucophlebia, indicating that screening of blue light in the cyanolichens inhibited blue light from reaching the photosynthetic apparatus. The UV and blue light absorbing compound scytonemin in cyanobacteria and in some lichens was suggested as a candidate for screening. HPLC analyses showed that L. hallii contained some scytonemin that partly may explain the blue light screening, whereas P. praetextata contained no scytonemin, Therefore, the mechanism for blue light screening and low blue light photosynthesis in cyanolichens remains unknown. 194
SPONSORS The 7 th International Association for Lichenology <strong>Symposium</strong> 2012 Petroleum Authority of Thailand (PTT) Thailand Convention and Exhibition Bureau Thailand Research Fund Office of the National Research Council of Thailand National Center for Genetic Engineering US National Science Foundation and Biotechnology The Field Museum, Chicago The British Lichen Society SUPPORTERS: • Aair Lichens Company • Becthai Bangkok Equipment & Chemical Co., Ltd. • Rushmore Pricision Co., Ltd. 195
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The 7 th IAL Symposium 2012 Lichens
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The 7 th International Association
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Welcome Message The 7 th Internatio
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Report The 7 th International Assoc
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IAL COUNCIL (2008-2012): The 7 th I
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