Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses
The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli...
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Masaryk University Press
2014
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Online Access: | http://dx.doi.org/10.5817/cpr2014-1-10 https://journals.muni.cz/CPR/article/viewFile/12850/11184 |
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crmasarykunivpr:10.5817/cpr2014-1-10 2024-09-15T17:41:06+00:00 Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses Očenášová, Petra Barták, Miloš Hájek, Josef 2014 http://dx.doi.org/10.5817/cpr2014-1-10 https://journals.muni.cz/CPR/article/viewFile/12850/11184 unknown Masaryk University Press http://creativecommons.org/licenses/by-nc-nd/4.0 Czech Polar Reports volume 4, issue 1, page 90-99 ISSN 1805-0697 1805-0689 journal-article 2014 crmasarykunivpr https://doi.org/10.5817/cpr2014-1-10 2024-06-27T04:16:41Z The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli of U. antarctica were collected at the James Ross Island, Antarctica (57°52´57´´ W, 63°48´02´´ S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to medium light intensities (300, 600 and 1000 mmol m-2 s-1 of photosynthetically active radiation) for 6 h. Before and during photoinhibitory treatments, chlorophyll fluorescence parameters, photoinhibitory (qI), state 1-2 transition (qT), and energy-dependent quenching (qE) in particular were measured to evaluate dose- and time-dependent changes in these parameters. The results showed that among the components forming non-photochemical quenching (qN), qI contributes to the largest extent to qN, while qE and qT contribute less. This finding differs from our earlier studies made in a short term-, and high light-treated U. antarctica that found qE together with qI is the most important part of non-photochemical quenching. Possible explanation is that photoinhibition in PS II in U. ant-arctica, when induced by low to medium light, activates qE to only limited extend and for a relatively short time (tens of minutes). With prolonged high light treatment lasting several hours, qE tends to be reduced to the values close to zero and qI then forms a major part of qN. Article in Journal/Newspaper Antarc* Antarctic Antarctica James Ross Island Ross Island Usnea antarctica Munipress - Masaryk University Press Czech Polar Reports 4 1 90 99 |
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Munipress - Masaryk University Press |
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crmasarykunivpr |
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unknown |
description |
The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli of U. antarctica were collected at the James Ross Island, Antarctica (57°52´57´´ W, 63°48´02´´ S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to medium light intensities (300, 600 and 1000 mmol m-2 s-1 of photosynthetically active radiation) for 6 h. Before and during photoinhibitory treatments, chlorophyll fluorescence parameters, photoinhibitory (qI), state 1-2 transition (qT), and energy-dependent quenching (qE) in particular were measured to evaluate dose- and time-dependent changes in these parameters. The results showed that among the components forming non-photochemical quenching (qN), qI contributes to the largest extent to qN, while qE and qT contribute less. This finding differs from our earlier studies made in a short term-, and high light-treated U. antarctica that found qE together with qI is the most important part of non-photochemical quenching. Possible explanation is that photoinhibition in PS II in U. ant-arctica, when induced by low to medium light, activates qE to only limited extend and for a relatively short time (tens of minutes). With prolonged high light treatment lasting several hours, qE tends to be reduced to the values close to zero and qI then forms a major part of qN. |
format |
Article in Journal/Newspaper |
author |
Očenášová, Petra Barták, Miloš Hájek, Josef |
spellingShingle |
Očenášová, Petra Barták, Miloš Hájek, Josef Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
author_facet |
Očenášová, Petra Barták, Miloš Hájek, Josef |
author_sort |
Očenášová, Petra |
title |
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
title_short |
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
title_full |
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
title_fullStr |
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
title_full_unstemmed |
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
title_sort |
photoinhibition of photosynthesis in antarctic lichen usnea antarctica. ii. analysis of non-photochemical quenching mechanisms activated by low to medium light doses |
publisher |
Masaryk University Press |
publishDate |
2014 |
url |
http://dx.doi.org/10.5817/cpr2014-1-10 https://journals.muni.cz/CPR/article/viewFile/12850/11184 |
genre |
Antarc* Antarctic Antarctica James Ross Island Ross Island Usnea antarctica |
genre_facet |
Antarc* Antarctic Antarctica James Ross Island Ross Island Usnea antarctica |
op_source |
Czech Polar Reports volume 4, issue 1, page 90-99 ISSN 1805-0697 1805-0689 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.5817/cpr2014-1-10 |
container_title |
Czech Polar Reports |
container_volume |
4 |
container_issue |
1 |
container_start_page |
90 |
op_container_end_page |
99 |
_version_ |
1810487197811343360 |