Reprint of Efficient fungal UV-screening provides a remarkably
high UV-B tolerance of photosystem II in lichen photobionts

J 2019

Reprint of Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts

VÁCZI, Peter, Yngvar GAUSLAA a Knut Asbjorn SOLHAUG

Základní údaje

Originální název

Reprint of Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts

Autoři

VÁCZI, Peter (703 Slovensko, domácí), Yngvar GAUSLAA a Knut Asbjorn SOLHAUG (garant)

Vydání

Plant Physiology and Biochemistry, Paris, Elsevier, 2019, 0981-9428

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10611 Plant sciences, botany

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.720

Kód RIV

RIV/00216224:14310/19:00113485

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1016/j.plaphy.2018.09.030

UT WoS

000455692000013

Klíčová slova anglicky

Chlorophyll fluorescence; Coccomyxa; Lichen cortex; Nephroma arcticum; Trebouxia; Umbilicaria spodochroa; UV-screening

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 1. 4. 2020 21:32, Mgr. Marie Šípková, DiS.

Anotace

V originále

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-B-BE 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.

Návaznosti

MUNI/A/0967/2009, interní kód MU

Název: Fyziologie rostlin (Akronym: FYZIOR)

Investor: Masarykova univerzita, Fyziologie rostlin, DO R. 2020_Kategorie A - Specifický výzkum - Studentské výzkumné projekty

Citovat

VÁCZI, Peter, Yngvar GAUSLAA a Knut Asbjorn SOLHAUG. Reprint of Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts. Plant Physiology and Biochemistry. Paris: Elsevier, 2019, roč. 134, JAN 2019, s. 123-128. ISSN 0981-9428. Dostupné z: https://dx.doi.org/10.1016/j.plaphy.2018.09.030.

@article{1641936,
   author = {Váczi, Peter and Gauslaa, Yngvar and Solhaug, Knut Asbjorn},
   article_location = {Paris},
   article_number = {JAN 2019},
   doi = {http://dx.doi.org/10.1016/j.plaphy.2018.09.030},
   keywords = {Chlorophyll fluorescence; Coccomyxa; Lichen cortex; Nephroma arcticum; Trebouxia; Umbilicaria spodochroa; UV-screening},
   language = {eng},
   issn = {0981-9428},
   journal = {Plant Physiology and Biochemistry},
   title = {Reprint of 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/S0981942818304297?via%3Dihub},
   volume = {134},
   year = {2019}
}

TY  - JOUR
ID  - 1641936
AU  - Váczi, Peter - Gauslaa, Yngvar - Solhaug, Knut Asbjorn
PY  - 2019
TI  - Reprint of Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts
JF  - Plant Physiology and Biochemistry
VL  - 134
IS  - JAN 2019
SP  - 123-128
EP  - 123-128
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/S0981942818304297?via%3Dihub
L2  - https://www.sciencedirect.com/science/article/pii/S0981942818304297?via%3Dihub
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-B-BE 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 Asbjorn SOLHAUG. Reprint of Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts. \textit{Plant Physiology and Biochemistry}. Paris: Elsevier, 2019, roč.~134, JAN 2019, s.~123-128. ISSN~0981-9428. Dostupné z: https://dx.doi.org/10.1016/j.plaphy.2018.09.030.

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