Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient
In this study, we investigated the effects of salt stress (2 mM NaCl) on excitation energy transfer from light harvesting complexes to photosystem II (PS II) in two Antarctic algal species: Klebsormidium sp. and Zygnema sp. Short-term salt stress led to a significant changes in the shape of chloroph...
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Masaryk University Press
2013
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Online Access: | http://dx.doi.org/10.5817/cpr2013-2-17 https://journals.muni.cz/CPR/article/viewFile/12838/11170 |
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crmasarykunivpr:10.5817/cpr2013-2-17 2024-05-19T07:31:51+00:00 Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient Vilumbrales, David Miguel Skácelová, Kateřina Barták, Miloš 2013 http://dx.doi.org/10.5817/cpr2013-2-17 https://journals.muni.cz/CPR/article/viewFile/12838/11170 unknown Masaryk University Press http://creativecommons.org/licenses/by-nc-nd/4.0 Czech Polar Reports volume 3, issue 2, page 163-172 ISSN 1805-0697 1805-0689 journal-article 2013 crmasarykunivpr https://doi.org/10.5817/cpr2013-2-17 2024-04-30T06:41:25Z In this study, we investigated the effects of salt stress (2 mM NaCl) on excitation energy transfer from light harvesting complexes to photosystem II (PS II) in two Antarctic algal species: Klebsormidium sp. and Zygnema sp. Short-term salt stress led to a significant changes in the shape of chlorophyll fluorescence transient (OJIP). Analyses of the polyphasic fluorescence transients (OJIP) showed that the fluorescence yield at the phases J, I and P declined considerably with the time of exposition to salt stress. In both experimental species, OJIP transients reached lowest values of chlorophyll fluorescence signal after 30/60 min. of NaCl exposition. Then, OJIP shape and chlorophyll fluo-rescence showed species-specific recovery and rised towards original values (about 2/3 of untreated control). Analyses of chlorophyll fluorescence parameters derived from OJIPs showed that salt stress led to a decrease in the maximal efficiency of PS II photo-chemistry (FV/FM) in Zygnema sp. but not Klebsormidium sp. The results indicated that the probability of excitation energy transfer before and beyond QA, and the yield of electron transport beyond QA is limited by salt-induced stress in Zygnema sp. In addition, salt stress resulted in a decrease in the photosynthetic electron transport per PS II reaction center, but both increase and decrease in the trapping per PS II reaction center was found. Performace index (PIabs) was affected negatively in Zygnema sp. but possitively Klebsormidium sp. indicating that the latter species was more resistant to salt stress than Zygnema sp. Article in Journal/Newspaper Antarc* Antarctic Munipress - Masaryk University Press Czech Polar Reports 3 2 163 172 |
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Open Polar |
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Munipress - Masaryk University Press |
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crmasarykunivpr |
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description |
In this study, we investigated the effects of salt stress (2 mM NaCl) on excitation energy transfer from light harvesting complexes to photosystem II (PS II) in two Antarctic algal species: Klebsormidium sp. and Zygnema sp. Short-term salt stress led to a significant changes in the shape of chlorophyll fluorescence transient (OJIP). Analyses of the polyphasic fluorescence transients (OJIP) showed that the fluorescence yield at the phases J, I and P declined considerably with the time of exposition to salt stress. In both experimental species, OJIP transients reached lowest values of chlorophyll fluorescence signal after 30/60 min. of NaCl exposition. Then, OJIP shape and chlorophyll fluo-rescence showed species-specific recovery and rised towards original values (about 2/3 of untreated control). Analyses of chlorophyll fluorescence parameters derived from OJIPs showed that salt stress led to a decrease in the maximal efficiency of PS II photo-chemistry (FV/FM) in Zygnema sp. but not Klebsormidium sp. The results indicated that the probability of excitation energy transfer before and beyond QA, and the yield of electron transport beyond QA is limited by salt-induced stress in Zygnema sp. In addition, salt stress resulted in a decrease in the photosynthetic electron transport per PS II reaction center, but both increase and decrease in the trapping per PS II reaction center was found. Performace index (PIabs) was affected negatively in Zygnema sp. but possitively Klebsormidium sp. indicating that the latter species was more resistant to salt stress than Zygnema sp. |
format |
Article in Journal/Newspaper |
author |
Vilumbrales, David Miguel Skácelová, Kateřina Barták, Miloš |
spellingShingle |
Vilumbrales, David Miguel Skácelová, Kateřina Barták, Miloš Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
author_facet |
Vilumbrales, David Miguel Skácelová, Kateřina Barták, Miloš |
author_sort |
Vilumbrales, David Miguel |
title |
Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
title_short |
Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
title_full |
Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
title_fullStr |
Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
title_full_unstemmed |
Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
title_sort |
sensitivity of antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient |
publisher |
Masaryk University Press |
publishDate |
2013 |
url |
http://dx.doi.org/10.5817/cpr2013-2-17 https://journals.muni.cz/CPR/article/viewFile/12838/11170 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Czech Polar Reports volume 3, issue 2, page 163-172 ISSN 1805-0697 1805-0689 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.5817/cpr2013-2-17 |
container_title |
Czech Polar Reports |
container_volume |
3 |
container_issue |
2 |
container_start_page |
163 |
op_container_end_page |
172 |
_version_ |
1799469735102906368 |