High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione
Abstract: The effect of high light on spatial distribution of chlorophyll (Chl) fluorescence parameters over a lichen thallus (Umbilicaria antarctica) was investigated by imaging of Chl fluorescence parameters before and after exposure to high light (1500 μmol m ‐2 s ‐1 , 30 min at 5 °C). False colo...
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crwiley:10.1055/s-2004-820877 2024-06-23T07:46:50+00:00 High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione Barták, M. Hájek, J. Vráblíková, H. Dubová, J. 2004 http://dx.doi.org/10.1055/s-2004-820877 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1055%2Fs-2004-820877 https://onlinelibrary.wiley.com/doi/pdf/10.1055/s-2004-820877 https://onlinelibrary.wiley.com/doi/full-xml/10.1055/s-2004-820877 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Plant Biology volume 6, issue 3, page 333-341 ISSN 1435-8603 1438-8677 journal-article 2004 crwiley https://doi.org/10.1055/s-2004-820877 2024-06-13T04:23:03Z Abstract: The effect of high light on spatial distribution of chlorophyll (Chl) fluorescence parameters over a lichen thallus (Umbilicaria antarctica) was investigated by imaging of Chl fluorescence parameters before and after exposure to high light (1500 μmol m ‐2 s ‐1 , 30 min at 5 °C). False colour images of F V /F M and Φ II distribution, taken over thallus with 0.1 mm 2 resolution, showed that maximum F V /F M and Φ II values were located close to the thallus centre. Minimum values were typical for thallus margins. After exposure to high light, a differential response of F V /F M and Φ II was found. The marginal thallus part exhibited a loss of photosynthetic activity, manifested as a lack of Chl fluorescence signal, and close‐to‐centre parts showed a different extent of F V /F M and Φ II decrease. Subsequent recovery in the dark led to a gradual return of F V /F M and Φ II to their initial values. Fast (30 min) and slow (1 ‐ 22 h) phase of recovery were distinguished, suggesting a sufficient capacity of photoprotective mechanisms in U. antarctica to cope with low‐temperature photoinhibition. Glutathione and xanthophyll cycle pigments were analyzed by HPLC. High light led to an increase in oxidized glutathione (GSSG), and a conversion of violaxanthin to zeaxanthin, expressed as their de‐epoxidation state (DEPS). The responses of GSSG and DEPS were reversible during subsequent recovery in the dark. GSSG and DEPS were highly correlated to non‐photochemical quenching (NPQ), indicating involvement of these antioxidants in the resistance of U. antarctica to high‐light stress. Heterogeneity of Chl fluorescence parameters over the thallus and differential response to high light are discussed in relation to thallus anatomy and intrathalline distribution of the symbiotic alga Trebouxia sp. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Plant Biology 6 3 333 341 |
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Wiley Online Library |
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English |
description |
Abstract: The effect of high light on spatial distribution of chlorophyll (Chl) fluorescence parameters over a lichen thallus (Umbilicaria antarctica) was investigated by imaging of Chl fluorescence parameters before and after exposure to high light (1500 μmol m ‐2 s ‐1 , 30 min at 5 °C). False colour images of F V /F M and Φ II distribution, taken over thallus with 0.1 mm 2 resolution, showed that maximum F V /F M and Φ II values were located close to the thallus centre. Minimum values were typical for thallus margins. After exposure to high light, a differential response of F V /F M and Φ II was found. The marginal thallus part exhibited a loss of photosynthetic activity, manifested as a lack of Chl fluorescence signal, and close‐to‐centre parts showed a different extent of F V /F M and Φ II decrease. Subsequent recovery in the dark led to a gradual return of F V /F M and Φ II to their initial values. Fast (30 min) and slow (1 ‐ 22 h) phase of recovery were distinguished, suggesting a sufficient capacity of photoprotective mechanisms in U. antarctica to cope with low‐temperature photoinhibition. Glutathione and xanthophyll cycle pigments were analyzed by HPLC. High light led to an increase in oxidized glutathione (GSSG), and a conversion of violaxanthin to zeaxanthin, expressed as their de‐epoxidation state (DEPS). The responses of GSSG and DEPS were reversible during subsequent recovery in the dark. GSSG and DEPS were highly correlated to non‐photochemical quenching (NPQ), indicating involvement of these antioxidants in the resistance of U. antarctica to high‐light stress. Heterogeneity of Chl fluorescence parameters over the thallus and differential response to high light are discussed in relation to thallus anatomy and intrathalline distribution of the symbiotic alga Trebouxia sp. |
format |
Article in Journal/Newspaper |
author |
Barták, M. Hájek, J. Vráblíková, H. Dubová, J. |
spellingShingle |
Barták, M. Hájek, J. Vráblíková, H. Dubová, J. High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
author_facet |
Barták, M. Hájek, J. Vráblíková, H. Dubová, J. |
author_sort |
Barták, M. |
title |
High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
title_short |
High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
title_full |
High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
title_fullStr |
High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
title_full_unstemmed |
High‐Light Stress and Photoprotection in Umbilicaria antarctica Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione |
title_sort |
high‐light stress and photoprotection in umbilicaria antarctica monitored by chlorophyll fluorescence imaging and changes in zeaxanthin and glutathione |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1055/s-2004-820877 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1055%2Fs-2004-820877 https://onlinelibrary.wiley.com/doi/pdf/10.1055/s-2004-820877 https://onlinelibrary.wiley.com/doi/full-xml/10.1055/s-2004-820877 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Plant Biology volume 6, issue 3, page 333-341 ISSN 1435-8603 1438-8677 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1055/s-2004-820877 |
container_title |
Plant Biology |
container_volume |
6 |
container_issue |
3 |
container_start_page |
333 |
op_container_end_page |
341 |
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1802648580442292224 |