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

J 2018

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

VÁCZI, Peter; Yngvar GAUSLAA a Knut Asbjørn SOLHAUG

Základní údaje

Originální název

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

Autoři

VÁCZI, Peter; Yngvar GAUSLAA a Knut Asbjørn SOLHAUG

Vydání

Plant Physiology and Biochemistry, Elsevier, 2018, 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

Link na výsledek na webu vydavatele

Impakt faktor

Impact factor: 3.404

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00104368

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

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

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 3. 12. 2018 08:41, Mgr. Peter Váczi, Ph.D.

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-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.

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 Asbjørn SOLHAUG. Efficient fungal UV-screening provides a remarkably high UV-B tolerance of photosystem II in lichen photobionts. Plant Physiology and Biochemistry. Elsevier, 2018, roč. 132, November, s. 89-94. ISSN 0981-9428. Dostupné z: https://doi.org/10.1016/j.plaphy.2018.08.033.

@article{1463619,
   author = {Váczi, Peter and Gauslaa, Yngvar and Solhaug, Knut Asbjørn},
   article_number = {November},
   doi = {https://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://doi.org/10.1016/j.plaphy.2018.08.033.

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