Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment
To date, a limited knowledge is available about Umbilicaria antarctica responses when it is exposed high doses of UV-B radiation. It is well established that resistance of Antarctic lichens to natural UV-B levels including increased doses during ozone hole period is high, thanks to numerous photopro...
Published in: | Czech Polar Reports |
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Masaryk University Press
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Online Access: | http://dx.doi.org/10.5817/cpr2015-2-19 https://journals.muni.cz/CPR/article/viewFile/12879/11214 |
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crmasarykunivpr:10.5817/cpr2015-2-19 2024-06-23T07:46:38+00:00 Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment Medina, Mariana Gonzalez Avalos-Chacon, Roxana 2015 http://dx.doi.org/10.5817/cpr2015-2-19 https://journals.muni.cz/CPR/article/viewFile/12879/11214 unknown Masaryk University Press http://creativecommons.org/licenses/by-nc-nd/4.0 Czech Polar Reports volume 5, issue 2, page 222-229 ISSN 1805-0697 1805-0689 journal-article 2015 crmasarykunivpr https://doi.org/10.5817/cpr2015-2-19 2024-05-30T08:19:59Z To date, a limited knowledge is available about Umbilicaria antarctica responses when it is exposed high doses of UV-B radiation. It is well established that resistance of Antarctic lichens to natural UV-B levels including increased doses during ozone hole period is high, thanks to numerous photoprotective mechanism. Capacity of the photoprotective processes, however, is not well known This study attempts to determine changes on the photosynthetic efficiency and on the synthesis of UV-B absorbing compounds of U. antarctica when exposed to low photosynthetically active radiation and extremely high intensity of UV-B light: 3.0 W m-2, of UV-B for 3 hours, 6 hours and 7 days. During the experiment, chlorophyll fluorescence was measured to evaluate changes in photosynthetic apparatus of intrathalline alga. After 7 d exposition, amount of UV-B absorbing compounds was evaluated in U. antarctica. Heavy UV-B stress let to an increase in chlorophyll fluorescence kinetics (OJIPs), however, majority of parameters related to functioning of PS II remained unchanged indicating high resistance of U. antarctica to UV-B stress. Potential (FV/FM) and actual (ФPSII) yields of PS II were not affected by the UV-B treatment as well. In majority of cases, heavy UV-B treatment led to a decrease in the amount of UV-B absorbing compounds extracted from treated thalli. Article in Journal/Newspaper Antarc* Antarctic Antarctica Munipress - Masaryk University Press Antarctic Czech Polar Reports 5 2 222 229 |
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Open Polar |
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Munipress - Masaryk University Press |
op_collection_id |
crmasarykunivpr |
language |
unknown |
description |
To date, a limited knowledge is available about Umbilicaria antarctica responses when it is exposed high doses of UV-B radiation. It is well established that resistance of Antarctic lichens to natural UV-B levels including increased doses during ozone hole period is high, thanks to numerous photoprotective mechanism. Capacity of the photoprotective processes, however, is not well known This study attempts to determine changes on the photosynthetic efficiency and on the synthesis of UV-B absorbing compounds of U. antarctica when exposed to low photosynthetically active radiation and extremely high intensity of UV-B light: 3.0 W m-2, of UV-B for 3 hours, 6 hours and 7 days. During the experiment, chlorophyll fluorescence was measured to evaluate changes in photosynthetic apparatus of intrathalline alga. After 7 d exposition, amount of UV-B absorbing compounds was evaluated in U. antarctica. Heavy UV-B stress let to an increase in chlorophyll fluorescence kinetics (OJIPs), however, majority of parameters related to functioning of PS II remained unchanged indicating high resistance of U. antarctica to UV-B stress. Potential (FV/FM) and actual (ФPSII) yields of PS II were not affected by the UV-B treatment as well. In majority of cases, heavy UV-B treatment led to a decrease in the amount of UV-B absorbing compounds extracted from treated thalli. |
format |
Article in Journal/Newspaper |
author |
Medina, Mariana Gonzalez Avalos-Chacon, Roxana |
spellingShingle |
Medina, Mariana Gonzalez Avalos-Chacon, Roxana Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
author_facet |
Medina, Mariana Gonzalez Avalos-Chacon, Roxana |
author_sort |
Medina, Mariana Gonzalez |
title |
Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
title_short |
Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
title_full |
Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
title_fullStr |
Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
title_full_unstemmed |
Physiological performance of a foliose macrolichen Umbilicaria antarctica as affected by supplemental UV-B treatment |
title_sort |
physiological performance of a foliose macrolichen umbilicaria antarctica as affected by supplemental uv-b treatment |
publisher |
Masaryk University Press |
publishDate |
2015 |
url |
http://dx.doi.org/10.5817/cpr2015-2-19 https://journals.muni.cz/CPR/article/viewFile/12879/11214 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Czech Polar Reports volume 5, issue 2, page 222-229 ISSN 1805-0697 1805-0689 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.5817/cpr2015-2-19 |
container_title |
Czech Polar Reports |
container_volume |
5 |
container_issue |
2 |
container_start_page |
222 |
op_container_end_page |
229 |
_version_ |
1802647181025345536 |