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Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night

Arctic macroalgae species have developed different growth strategies to survive extreme seasonal changes in irradiance in polar regions. We compared photophysiological parameters such as the light saturation parameter (E(k)) and pigment composition of green, red, and brown macroalgae collected in Ja...

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Autores principales: Summers, Natalie, Fragoso, Glaucia M., Johnsen, Geir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10589289/
https://www.ncbi.nlm.nih.gov/pubmed/37863949
http://dx.doi.org/10.1038/s41598-023-44026-5
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author Summers, Natalie
Fragoso, Glaucia M.
Johnsen, Geir
author_facet Summers, Natalie
Fragoso, Glaucia M.
Johnsen, Geir
author_sort Summers, Natalie
collection PubMed
description Arctic macroalgae species have developed different growth strategies to survive extreme seasonal changes in irradiance in polar regions. We compared photophysiological parameters such as the light saturation parameter (E(k)) and pigment composition of green, red, and brown macroalgae collected in January (Polar Night) and October 2020 (end of the light season). Macroalgae in January appeared healthier (morphologically) and had longer lamina (new growth) than those in October. E(K) values for red, and brown algae were higher with lower maximum quantum yield of PS II fluorescence (F(v)/F(m)) in January versus October. Furthermore, in January, new tissues in kelp species had higher E(K) than the older tissue. Higher E(K) and lower F(v)/F(m) during the Polar Night indicates that the photosynthetic apparatus is active but slow. Furthermore, we discuss Chlorophyll (Chl) a emission spectra under blue and green excitation light to determine the ratio of Chl a in photosystem II (PS II) vs photosystem I (PS I). Absorbance spectra of P. palmata was used to interpret the emission spectra. The observed spectral shifts in the absorbance and reflectance spectra of different macroalgae is discussed. Photophysiological methods provide health information complementary to future mapping and monitoring of macroalgae. These results reveal that macroalgae grow new tissue in darkness.
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spelling pubmed-105892892023-10-22 Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night Summers, Natalie Fragoso, Glaucia M. Johnsen, Geir Sci Rep Article Arctic macroalgae species have developed different growth strategies to survive extreme seasonal changes in irradiance in polar regions. We compared photophysiological parameters such as the light saturation parameter (E(k)) and pigment composition of green, red, and brown macroalgae collected in January (Polar Night) and October 2020 (end of the light season). Macroalgae in January appeared healthier (morphologically) and had longer lamina (new growth) than those in October. E(K) values for red, and brown algae were higher with lower maximum quantum yield of PS II fluorescence (F(v)/F(m)) in January versus October. Furthermore, in January, new tissues in kelp species had higher E(K) than the older tissue. Higher E(K) and lower F(v)/F(m) during the Polar Night indicates that the photosynthetic apparatus is active but slow. Furthermore, we discuss Chlorophyll (Chl) a emission spectra under blue and green excitation light to determine the ratio of Chl a in photosystem II (PS II) vs photosystem I (PS I). Absorbance spectra of P. palmata was used to interpret the emission spectra. The observed spectral shifts in the absorbance and reflectance spectra of different macroalgae is discussed. Photophysiological methods provide health information complementary to future mapping and monitoring of macroalgae. These results reveal that macroalgae grow new tissue in darkness. Nature Publishing Group UK 2023-10-20 /pmc/articles/PMC10589289/ /pubmed/37863949 http://dx.doi.org/10.1038/s41598-023-44026-5 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Summers, Natalie
Fragoso, Glaucia M.
Johnsen, Geir
Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title_full Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title_fullStr Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title_full_unstemmed Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title_short Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
title_sort photophysiologically active green, red, and brown macroalgae living in the arctic polar night
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10589289/
https://www.ncbi.nlm.nih.gov/pubmed/37863949
http://dx.doi.org/10.1038/s41598-023-44026-5
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