Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation
This study aimed to evaluate the effective photosynthetic quantum yield (FPSII) and the Photochemical Reflectance Index (PRI) for assessment of photosynthetic performance of two Umbilicaria lichens during gradual desiccation of their thalli. U. cylindrica andU. decussata exhibited curvilinear relati...
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ftmasarykunivojs:oai:ojs.journals.muni.cz:article/12813 2023-05-15T18:29:49+02:00 Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation Jupa, Radek Hájek, Josef Hazdrová, Jana Barták, Miloš 2012-01-01 application/pdf http://journals.muni.cz/CPR/article/view/12813 eng eng Masaryk Univerzity http://journals.muni.cz/CPR/article/view/12813/11129 http://journals.muni.cz/CPR/article/view/12813 Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Czech Polar Reports; Vol 2 No 1 (2012); 31-41 Czech Polar Reports; Vol. 2 No. 1 (2012); 31-41 1805-0697 1805-0689 Quantum yield water potential chlorophyll fluorescence Photochemical Reflectance Index lichen water stress info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftmasarykunivojs 2022-06-26T10:16:32Z This study aimed to evaluate the effective photosynthetic quantum yield (FPSII) and the Photochemical Reflectance Index (PRI) for assessment of photosynthetic performance of two Umbilicaria lichens during gradual desiccation of their thalli. U. cylindrica andU. decussata exhibited curvilinear relationship (S-shape curve) of decreasing FPSII values with decreasing water potential (WP) of thalli. During initial phase of desiccation (WP from 0 to -10 MPa), no decrease of FPSII was apparent, further desiccation (WP from -10 to -20 MPa) led to fast FPSII decrease from 0.6 to 0.1 indicating strong inhibition of photosynthetic processes. Critical WP at which photosythetic processes are fully inhibited was found bellow -25 MPa in both lichen species. Photochemical Reflectance Index (PRI) exhibited curvilinear increase with thalli desiccation (decreasing WP). At full thallus hydration, the PRI reached the value of -0.18 in both species. Under strong dehydration (WP from -20 to -30 MPa), however, U. cylindrica showed somewhat lower value (-0.04) than U.decussata (-0.02 MPa). PRI to WP relationship is discussed and compared to existing evidence from higher plants and poikilohydric organisms. Article in Journal/Newspaper Svalbard Masaryk University Journals Svalbard |
institution |
Open Polar |
collection |
Masaryk University Journals |
op_collection_id |
ftmasarykunivojs |
language |
English |
topic |
Quantum yield water potential chlorophyll fluorescence Photochemical Reflectance Index lichen water stress |
spellingShingle |
Quantum yield water potential chlorophyll fluorescence Photochemical Reflectance Index lichen water stress Jupa, Radek Hájek, Josef Hazdrová, Jana Barták, Miloš Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
topic_facet |
Quantum yield water potential chlorophyll fluorescence Photochemical Reflectance Index lichen water stress |
description |
This study aimed to evaluate the effective photosynthetic quantum yield (FPSII) and the Photochemical Reflectance Index (PRI) for assessment of photosynthetic performance of two Umbilicaria lichens during gradual desiccation of their thalli. U. cylindrica andU. decussata exhibited curvilinear relationship (S-shape curve) of decreasing FPSII values with decreasing water potential (WP) of thalli. During initial phase of desiccation (WP from 0 to -10 MPa), no decrease of FPSII was apparent, further desiccation (WP from -10 to -20 MPa) led to fast FPSII decrease from 0.6 to 0.1 indicating strong inhibition of photosynthetic processes. Critical WP at which photosythetic processes are fully inhibited was found bellow -25 MPa in both lichen species. Photochemical Reflectance Index (PRI) exhibited curvilinear increase with thalli desiccation (decreasing WP). At full thallus hydration, the PRI reached the value of -0.18 in both species. Under strong dehydration (WP from -20 to -30 MPa), however, U. cylindrica showed somewhat lower value (-0.04) than U.decussata (-0.02 MPa). PRI to WP relationship is discussed and compared to existing evidence from higher plants and poikilohydric organisms. |
format |
Article in Journal/Newspaper |
author |
Jupa, Radek Hájek, Josef Hazdrová, Jana Barták, Miloš |
author_facet |
Jupa, Radek Hájek, Josef Hazdrová, Jana Barták, Miloš |
author_sort |
Jupa, Radek |
title |
Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
title_short |
Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
title_full |
Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
title_fullStr |
Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
title_full_unstemmed |
Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation |
title_sort |
interspecific differences in photosynthetic efficiency and spectral reflectance in two umbilicaria species from svalbard during controlled desiccation |
publisher |
Masaryk Univerzity |
publishDate |
2012 |
url |
http://journals.muni.cz/CPR/article/view/12813 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Czech Polar Reports; Vol 2 No 1 (2012); 31-41 Czech Polar Reports; Vol. 2 No. 1 (2012); 31-41 1805-0697 1805-0689 |
op_relation |
http://journals.muni.cz/CPR/article/view/12813/11129 http://journals.muni.cz/CPR/article/view/12813 |
op_rights |
Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766213204652851200 |