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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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