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@article{1463619, author = {Váczi, Peter and Gauslaa, Yngvar and Solhaug, Knut Asbjørn}, article_number = {November}, doi = {http://dx.doi.org/10.1016/j.plaphy.2018.08.033}, keywords = {Chlorophyll fluorescence; Coccomyxa; Lichen cortex; Nephroma arcticum; Trebouxia; Umbilicaria spodochroa; UV-screening}, language = {eng}, issn = {0981-9428}, journal = {Plant Physiology and Biochemistry}, title = {Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts}, url = {https://www.sciencedirect.com/science/article/pii/S0981942818303905}, volume = {132}, year = {2018} }
TY - JOUR ID - 1463619 AU - Váczi, Peter - Gauslaa, Yngvar - Solhaug, Knut Asbjørn PY - 2018 TI - Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts JF - Plant Physiology and Biochemistry VL - 132 IS - November SP - 89-94 EP - 89-94 PB - Elsevier SN - 09819428 KW - Chlorophyll fluorescence KW - Coccomyxa KW - Lichen cortex KW - Nephroma arcticum KW - Trebouxia KW - Umbilicaria spodochroa KW - UV-screening UR - https://www.sciencedirect.com/science/article/pii/S0981942818303905 L2 - https://www.sciencedirect.com/science/article/pii/S0981942818303905 N2 - Lichen photobionts in situ have an extremely UV-B tolerant photosystem II efficiency (Fv/Fm). We have quantified the UV-B-screening offered by the mycobiont and the photobiont separately. The foliose lichens Nephroma arcticum and Umbilicaria spodochroa with 1: intact or 2: removed cortices were exposed to 0.7 Wm-2 UV-BBE for 4 h. Intact thalli experienced no reduction in Fv/Fm, whereas cortex removal lowered Fv/Fm in exposed photobiont layers by 22% for U. spodochroa and by 14% for N. arcticum. We also gave this UV-B dose to algal cultures of Coccomyxa and Trebouxia, the photobiont genera of N. arcticum and U. spodochroa, respectively. UV-B caused a 56% reduction in Fv/Fm for Coccomyxa, and as much as 98% in Trebouxia. The fluorescence excitation ratio (FER) technique comparing the fluorescence from UV-B– or UV-A-excitation light with blue green excitation light using a Xe-PAM fluorometer showed that these photobiont genera did not screen any UV-B or UV-A The FER technique with a Multiplex fluorometer estimated the UV-A screening of isolated algae to be 13–16%, whereas intact lichens screened 92–95% of the UV-A. In conclusion, the cortex of N. arcticum and U. spodochroa transmitted no UV-B and little UV-A to the photobiont layer beneath. Thereby, the upper lichen cortex forms an efficient fungal solar radiation screen providing a high UV-B tolerance for studied photobionts in situ. By contrast, isolated photobionts have no UV-B screening and thus depend on their fungal partners in nature. ER -
VÁCZI, Peter, Yngvar GAUSLAA a Knut Asbjørn SOLHAUG. Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts. \textit{Plant Physiology and Biochemistry}. Elsevier, 2018, roč.~132, November, s.~89-94. ISSN~0981-9428. Dostupné z: https://dx.doi.org/10.1016/j.plaphy.2018.08.033.
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