Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen
In the present paper, the results of the research of biometric parameters and functional peculiarities of photosynthetic apparatus of Stellaria humifusa in West Spitsbergen are discussed. The study showed that the largest proportion of the mat is composed of a brown layer of dead leaves covering the...
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ftmasarykunivojs:oai:ojs.journals.muni.cz:article/13061 2023-05-15T18:27:16+02:00 Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen Markovskaya, Eugenia Fedorovna Novichonok, Elena Valentinovna Shmakova, Natalya Yurievna 2019-06-01 application/pdf http://journals.muni.cz/CPR/article/view/13061 eng eng Masaryk Univerzity http://journals.muni.cz/CPR/article/view/13061/11319 http://journals.muni.cz/CPR/article/view/13061 Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Czech Polar Reports; Vol 9 No 2 (2019); 152-159 Czech Polar Reports; Vol. 9 No. 2 (2019); 152-159 1805-0697 1805-0689 chlorophyll fluorescence photosynthetic apparatus adaptation photosynthetic pigments mat morphological peculiarities info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftmasarykunivojs 2022-06-26T10:16:45Z In the present paper, the results of the research of biometric parameters and functional peculiarities of photosynthetic apparatus of Stellaria humifusa in West Spitsbergen are discussed. The study showed that the largest proportion of the mat is composed of a brown layer of dead leaves covering the assimilative organs (about 70%). Green leaves and shoots accounted for about 20%, whereas generative organs – for about 10% of the mat mass. The values of the maximum photochemical quantum yield of PS II (FV/FM) in all the studied plants were lower than the optimal values (0.83), which suggests that the plants are exposed to stress factors. The low values of chlorophyll and carotenoid content and relatively high values of the light-harvesting complex (70-80%), the sharp decrease in the quantum yield of PS II (FPSII) entailed by a marginal increase in PPFD indicative of a sufficiently high of photochemical activity within the range of low and medium values of light. It also suggests that Stellaria humifusa is well-adapted to the shaded conditions created in the mat. Besides, a considerable decrease the maximum fluorescence yield of a light-adapted leaf (FM´) at increasing PPFD was observed, which suggests that Stellaria humifusa has a well-developed mechanism of energy dissipation via the non-photochemical (NPQ) pathway. The rapid development of NPQ gives reason to assume that, under high light conditions, non-photochemical quenching is likely to serve as the main mechanism for preventing the photodamage of the photosynthetic apparatus. Thus, it was shown that the photosynthetic apparatus of Stellaria humifusa works efficiently under the conditions created in the mat, and the thick layer of dead leaves covering the assimilative organs, on the one hand, protects them from excessive light, and on the other hand, absorbs thermal energy, which raises temperature of the local habitat. Article in Journal/Newspaper Stellaria humifusa Spitsbergen Masaryk University Journals |
institution |
Open Polar |
collection |
Masaryk University Journals |
op_collection_id |
ftmasarykunivojs |
language |
English |
topic |
chlorophyll fluorescence photosynthetic apparatus adaptation photosynthetic pigments mat morphological peculiarities |
spellingShingle |
chlorophyll fluorescence photosynthetic apparatus adaptation photosynthetic pigments mat morphological peculiarities Markovskaya, Eugenia Fedorovna Novichonok, Elena Valentinovna Shmakova, Natalya Yurievna Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
topic_facet |
chlorophyll fluorescence photosynthetic apparatus adaptation photosynthetic pigments mat morphological peculiarities |
description |
In the present paper, the results of the research of biometric parameters and functional peculiarities of photosynthetic apparatus of Stellaria humifusa in West Spitsbergen are discussed. The study showed that the largest proportion of the mat is composed of a brown layer of dead leaves covering the assimilative organs (about 70%). Green leaves and shoots accounted for about 20%, whereas generative organs – for about 10% of the mat mass. The values of the maximum photochemical quantum yield of PS II (FV/FM) in all the studied plants were lower than the optimal values (0.83), which suggests that the plants are exposed to stress factors. The low values of chlorophyll and carotenoid content and relatively high values of the light-harvesting complex (70-80%), the sharp decrease in the quantum yield of PS II (FPSII) entailed by a marginal increase in PPFD indicative of a sufficiently high of photochemical activity within the range of low and medium values of light. It also suggests that Stellaria humifusa is well-adapted to the shaded conditions created in the mat. Besides, a considerable decrease the maximum fluorescence yield of a light-adapted leaf (FM´) at increasing PPFD was observed, which suggests that Stellaria humifusa has a well-developed mechanism of energy dissipation via the non-photochemical (NPQ) pathway. The rapid development of NPQ gives reason to assume that, under high light conditions, non-photochemical quenching is likely to serve as the main mechanism for preventing the photodamage of the photosynthetic apparatus. Thus, it was shown that the photosynthetic apparatus of Stellaria humifusa works efficiently under the conditions created in the mat, and the thick layer of dead leaves covering the assimilative organs, on the one hand, protects them from excessive light, and on the other hand, absorbs thermal energy, which raises temperature of the local habitat. |
format |
Article in Journal/Newspaper |
author |
Markovskaya, Eugenia Fedorovna Novichonok, Elena Valentinovna Shmakova, Natalya Yurievna |
author_facet |
Markovskaya, Eugenia Fedorovna Novichonok, Elena Valentinovna Shmakova, Natalya Yurievna |
author_sort |
Markovskaya, Eugenia Fedorovna |
title |
Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
title_short |
Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
title_full |
Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
title_fullStr |
Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
title_full_unstemmed |
Eco-physiological peculiarities of Stellaria humifusa in West Spitsbergen |
title_sort |
eco-physiological peculiarities of stellaria humifusa in west spitsbergen |
publisher |
Masaryk Univerzity |
publishDate |
2019 |
url |
http://journals.muni.cz/CPR/article/view/13061 |
genre |
Stellaria humifusa Spitsbergen |
genre_facet |
Stellaria humifusa Spitsbergen |
op_source |
Czech Polar Reports; Vol 9 No 2 (2019); 152-159 Czech Polar Reports; Vol. 9 No. 2 (2019); 152-159 1805-0697 1805-0689 |
op_relation |
http://journals.muni.cz/CPR/article/view/13061/11319 http://journals.muni.cz/CPR/article/view/13061 |
op_rights |
Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766209318748684288 |