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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2018.08.033
|2 doi
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|a pubmed24n0960.xml
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|a (NLM)30176432
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|a (PII)S0981-9428(18)30390-5
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|a DE-627
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|e rakwb
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|a eng
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|a Váczi, Peter
|e verfasserin
|4 aut
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|a Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 26.11.2018
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2018 Elsevier Masson SAS. All rights reserved.
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|a 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
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|a Journal Article
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|a Chlorophyll fluorescence
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|a Coccomyxa
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|a Lichen cortex
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|a Nephroma arcticum
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|a Trebouxia
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|a UV-screening
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|a Umbilicaria spodochroa
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|a Photosystem II Protein Complex
|2 NLM
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|a Gauslaa, Yngvar
|e verfasserin
|4 aut
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|a Solhaug, Knut Asbjørn
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 132(2018) vom: 05. Nov., Seite 89-94
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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|g volume:132
|g year:2018
|g day:05
|g month:11
|g pages:89-94
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|u http://dx.doi.org/10.1016/j.plaphy.2018.08.033
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