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) t...

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Autores principales:	Waterman,Melinda J., Bramley-Alves,Jessica, Miller,Rebecca E., Keller,Paul A., Robinson,Sharon A.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2018
Materias:	Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Cell wall Anthocyanins FT-IR
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602018000100239
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spelling	oai:scielo:S0716-976020180001002392019-06-24Photoprotection enhanced by red cell wall pigments in three East Antarctic mossesWaterman,Melinda J.Bramley-Alves,JessicaMiller,Rebecca E.Keller,Paul A.Robinson,Sharon A. Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Cell wall Anthocyanins FT-IR 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.info:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.51 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602018000100239en10.1186/s40659-018-0196-1
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Cell wall Anthocyanins FT-IR
spellingShingle	Antarctic moss Ceratodon purpureus Bryum pseudotriquetrum Schistidium antarctici Bryophyte UV-B-absorbing compounds Cell wall Anthocyanins FT-IR Waterman,Melinda J. Bramley-Alves,Jessica Miller,Rebecca E. Keller,Paul A. Robinson,Sharon A. Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses
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.
author	Waterman,Melinda J. Bramley-Alves,Jessica Miller,Rebecca E. Keller,Paul A. Robinson,Sharon A.
author_facet	Waterman,Melinda J. Bramley-Alves,Jessica Miller,Rebecca E. Keller,Paul A. Robinson,Sharon A.
author_sort	Waterman,Melinda J.
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	Sociedad de Biología de Chile
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602018000100239
work_keys_str_mv	AT watermanmelindaj photoprotectionenhancedbyredcellwallpigmentsinthreeeastantarcticmosses AT bramleyalvesjessica photoprotectionenhancedbyredcellwallpigmentsinthreeeastantarcticmosses AT millerrebeccae photoprotectionenhancedbyredcellwallpigmentsinthreeeastantarcticmosses AT kellerpaula photoprotectionenhancedbyredcellwallpigmentsinthreeeastantarcticmosses AT robinsonsharona photoprotectionenhancedbyredcellwallpigmentsinthreeeastantarcticmosses
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Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses

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