Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
Abstract 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 (Ek) and pigment composition of green, red, and brown macroalgae collecte...
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ftdoajarticles:oai:doaj.org/article:75b0a093aa6448aa958c5e15a23bfec9 2023-11-12T04:12:24+01:00 Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night Natalie Summers Glaucia M. Fragoso Geir Johnsen 2023-10-01T00:00:00Z https://doi.org/10.1038/s41598-023-44026-5 https://doaj.org/article/75b0a093aa6448aa958c5e15a23bfec9 EN eng Nature Portfolio https://doi.org/10.1038/s41598-023-44026-5 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-023-44026-5 2045-2322 https://doaj.org/article/75b0a093aa6448aa958c5e15a23bfec9 Scientific Reports, Vol 13, Iss 1, Pp 1-16 (2023) Medicine R Science Q article 2023 ftdoajarticles https://doi.org/10.1038/s41598-023-44026-5 2023-10-29T00:42:05Z Abstract 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 (Ek) 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. EK values for red, and brown algae were higher with lower maximum quantum yield of PS II fluorescence (Fv/Fm) in January versus October. Furthermore, in January, new tissues in kelp species had higher EK than the older tissue. Higher EK and lower Fv/Fm 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. Article in Journal/Newspaper Arctic polar night Directory of Open Access Journals: DOAJ Articles Scientific Reports 13 1 |
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Medicine R Science Q Natalie Summers Glaucia M. Fragoso Geir Johnsen Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night |
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Medicine R Science Q |
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Abstract 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 (Ek) 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. EK values for red, and brown algae were higher with lower maximum quantum yield of PS II fluorescence (Fv/Fm) in January versus October. Furthermore, in January, new tissues in kelp species had higher EK than the older tissue. Higher EK and lower Fv/Fm 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. |
format |
Article in Journal/Newspaper |
author |
Natalie Summers Glaucia M. Fragoso Geir Johnsen |
author_facet |
Natalie Summers Glaucia M. Fragoso Geir Johnsen |
author_sort |
Natalie Summers |
title |
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_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_sort |
photophysiologically active green, red, and brown macroalgae living in the arctic polar night |
publisher |
Nature Portfolio |
publishDate |
2023 |
url |
https://doi.org/10.1038/s41598-023-44026-5 https://doaj.org/article/75b0a093aa6448aa958c5e15a23bfec9 |
genre |
Arctic polar night |
genre_facet |
Arctic polar night |
op_source |
Scientific Reports, Vol 13, Iss 1, Pp 1-16 (2023) |
op_relation |
https://doi.org/10.1038/s41598-023-44026-5 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-023-44026-5 2045-2322 https://doaj.org/article/75b0a093aa6448aa958c5e15a23bfec9 |
op_doi |
https://doi.org/10.1038/s41598-023-44026-5 |
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Scientific Reports |
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13 |
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1782330955811258368 |