Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses
Abstract Background Antarctic bryophytes (mosses and liverworts) are resilient to physiologically extreme environmental conditions including elevated levels of ultraviolet (UV) radiation due to depletion of stratospheric ozone. Many Antarctic bryophytes synthesise UV-B-absorbing compounds (UVAC) tha...
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ftdoajarticles:oai:doaj.org/article:a0f5497755d14b12a2078fc1d6310041 2023-05-15T13:40:50+02:00 Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses Melinda J. Waterman Jessica Bramley-Alves Rebecca E. Miller Paul A. Keller Sharon A. Robinson 2018-11-01T00:00:00Z https://doi.org/10.1186/s40659-018-0196-1 https://doaj.org/article/a0f5497755d14b12a2078fc1d6310041 EN eng BMC http://link.springer.com/article/10.1186/s40659-018-0196-1 https://doaj.org/toc/0717-6287 doi:10.1186/s40659-018-0196-1 0717-6287 https://doaj.org/article/a0f5497755d14b12a2078fc1d6310041 Biological Research, Vol 51, Iss 1, Pp 1-13 (2018) Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Biology (General) QH301-705.5 article 2018 ftdoajarticles https://doi.org/10.1186/s40659-018-0196-1 2022-12-30T23:54:00Z Abstract Background Antarctic bryophytes (mosses and liverworts) are resilient to physiologically extreme environmental conditions including elevated levels of ultraviolet (UV) radiation due to depletion of stratospheric ozone. Many Antarctic bryophytes synthesise UV-B-absorbing compounds (UVAC) that are localised in their cells and cell walls, a location that is rarely investigated for UVAC in plants. This study compares the concentrations and localisation of intracellular and cell wall UVAC in Antarctic Ceratodon purpureus, Bryum pseudotriquetrum and Schistidium antarctici from the Windmill Islands, East Antarctica. Results Multiple stresses, including desiccation and naturally high UV and visible light, seemed to enhance the incorporation of total UVAC including red pigments in the cell walls of all three Antarctic species analysed. The red growth form of C. purpureus had significantly higher levels of cell wall bound and lower intracellular UVAC concentrations than its nearby green form. Microscopic and spectroscopic analyses showed that the red colouration in this species was associated with the cell wall and that these red cell walls contained less pectin and phenolic esters than the green form. All three moss species showed a natural increase in cell wall UVAC content during the growing season and a decline in these compounds in new tissue grown under less stressful conditions in the laboratory. Conclusions UVAC and red pigments are tightly bound to the cell wall and likely have a long-term protective role in Antarctic bryophytes. Although the identity of these red pigments remains unknown, our study demonstrates the importance of investigating cell wall UVAC in plants and contributes to our current understanding of UV-protective strategies employed by particular Antarctic bryophytes. Studies such as these provide clues to how these plants survive in such extreme habitats and are helpful in predicting future survival of the species studied. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Schistidium antarctici Windmill Islands Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) Biological Research 51 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Biology (General) QH301-705.5 |
spellingShingle |
Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Biology (General) QH301-705.5 Melinda J. Waterman Jessica Bramley-Alves Rebecca E. Miller Paul A. Keller Sharon A. Robinson Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
topic_facet |
Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Biology (General) QH301-705.5 |
description |
Abstract Background Antarctic bryophytes (mosses and liverworts) are resilient to physiologically extreme environmental conditions including elevated levels of ultraviolet (UV) radiation due to depletion of stratospheric ozone. Many Antarctic bryophytes synthesise UV-B-absorbing compounds (UVAC) that are localised in their cells and cell walls, a location that is rarely investigated for UVAC in plants. This study compares the concentrations and localisation of intracellular and cell wall UVAC in Antarctic Ceratodon purpureus, Bryum pseudotriquetrum and Schistidium antarctici from the Windmill Islands, East Antarctica. Results Multiple stresses, including desiccation and naturally high UV and visible light, seemed to enhance the incorporation of total UVAC including red pigments in the cell walls of all three Antarctic species analysed. The red growth form of C. purpureus had significantly higher levels of cell wall bound and lower intracellular UVAC concentrations than its nearby green form. Microscopic and spectroscopic analyses showed that the red colouration in this species was associated with the cell wall and that these red cell walls contained less pectin and phenolic esters than the green form. All three moss species showed a natural increase in cell wall UVAC content during the growing season and a decline in these compounds in new tissue grown under less stressful conditions in the laboratory. Conclusions UVAC and red pigments are tightly bound to the cell wall and likely have a long-term protective role in Antarctic bryophytes. Although the identity of these red pigments remains unknown, our study demonstrates the importance of investigating cell wall UVAC in plants and contributes to our current understanding of UV-protective strategies employed by particular Antarctic bryophytes. Studies such as these provide clues to how these plants survive in such extreme habitats and are helpful in predicting future survival of the species studied. |
format |
Article in Journal/Newspaper |
author |
Melinda J. Waterman Jessica Bramley-Alves Rebecca E. Miller Paul A. Keller Sharon A. Robinson |
author_facet |
Melinda J. Waterman Jessica Bramley-Alves Rebecca E. Miller Paul A. Keller Sharon A. Robinson |
author_sort |
Melinda J. Waterman |
title |
Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
title_short |
Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
title_full |
Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
title_fullStr |
Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
title_full_unstemmed |
Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses |
title_sort |
photoprotection enhanced by red cell wall pigments in three east antarctic mosses |
publisher |
BMC |
publishDate |
2018 |
url |
https://doi.org/10.1186/s40659-018-0196-1 https://doaj.org/article/a0f5497755d14b12a2078fc1d6310041 |
long_lat |
ENVELOPE(110.417,110.417,-66.350,-66.350) |
geographic |
Antarctic East Antarctica Windmill Islands |
geographic_facet |
Antarctic East Antarctica Windmill Islands |
genre |
Antarc* Antarctic Antarctica East Antarctica Schistidium antarctici Windmill Islands |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Schistidium antarctici Windmill Islands |
op_source |
Biological Research, Vol 51, Iss 1, Pp 1-13 (2018) |
op_relation |
http://link.springer.com/article/10.1186/s40659-018-0196-1 https://doaj.org/toc/0717-6287 doi:10.1186/s40659-018-0196-1 0717-6287 https://doaj.org/article/a0f5497755d14b12a2078fc1d6310041 |
op_doi |
https://doi.org/10.1186/s40659-018-0196-1 |
container_title |
Biological Research |
container_volume |
51 |
container_issue |
1 |
_version_ |
1766141039351955456 |