Desiccation tolerance of three moss species from continental Antarctica
Tolerance of desiccation was examined in three species of moss, Grimmia antarctici Card., Ceratodon purpureus (Hedw.) Brid. and Bryum pseudotriquetrum (Hedw.) Gaertn., Meyer et Scherb. collected from two sites of contrasting water availability in the Windmill Islands, continental Antarctica. Physiol...
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ftunivwollongong:oai:ro.uow.edu.au:scipapers-1053 2023-05-15T13:53:47+02:00 Desiccation tolerance of three moss species from continental Antarctica Robinson, Sharon A. Wasley, J. Popp, M. Lovelock, C. E. 2000-01-01T08:00:00Z application/pdf https://ro.uow.edu.au/scipapers/49 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1053&context=scipapers unknown Research Online https://ro.uow.edu.au/scipapers/49 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1053&context=scipapers Faculty of Science - Papers (Archive) Bryum pseudotriquetrum Ceratodon purpureus chlorophyll fluorescence Grimmia antarctici stachyose soluble carbohydrates Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences article 2000 ftunivwollongong 2020-02-25T11:12:02Z Tolerance of desiccation was examined in three species of moss, Grimmia antarctici Card., Ceratodon purpureus (Hedw.) Brid. and Bryum pseudotriquetrum (Hedw.) Gaertn., Meyer et Scherb. collected from two sites of contrasting water availability in the Windmill Islands, continental Antarctica. Physiological tolerance to desiccation was measured using chlorophyll fluorescence in plugs of moss during natural drying in the laboratory. Differences in relative water contents, rates of drying and the response of photosynthesis to desiccation were observed among the three species and between sites. Of the three species studied, G. antarctici showed the lowest capacity to sustain photosynthetic processes during desiccation, B. pseudotriquetrum had an intermediate response and showed the greatest plasticity and C. purpureus showed the greatest capacity to sustain photosynthesis during desiccation. These results fit well with the known distribution of the three species with G. antarctici being limited to relatively wet sites, C. purpureus being common in the driest sites and B. pseudotriquetrum showing a wide distribution between these two extremes. Levels of soluble carbohydrates were also measured in these samples following desiccation and these indicate the presence of stachyose, an oligosaccharide known to be important in desiccation tolerance in seeds, in B. pseudotriquetrum. Both gross morphology and carbohydrate content are likely to contribute to differences in desiccation tolerance of the moss species. These results indicate that if the Casey region continues to dry out, as a result of local geological uplifting or global climate change, we would expect to see not only reductions in the moss community but also changes in community composition. Grimmia antarctici is likely to become more limited in distribution as C. purpureus and B. pseudotriquetrum expand into drying areas Article in Journal/Newspaper Antarc* Antarctica Grimmia antarctici Windmill Islands University of Wollongong, Australia: Research Online Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
Bryum pseudotriquetrum Ceratodon purpureus chlorophyll fluorescence Grimmia antarctici stachyose soluble carbohydrates Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences |
spellingShingle |
Bryum pseudotriquetrum Ceratodon purpureus chlorophyll fluorescence Grimmia antarctici stachyose soluble carbohydrates Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences Robinson, Sharon A. Wasley, J. Popp, M. Lovelock, C. E. Desiccation tolerance of three moss species from continental Antarctica |
topic_facet |
Bryum pseudotriquetrum Ceratodon purpureus chlorophyll fluorescence Grimmia antarctici stachyose soluble carbohydrates Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences |
description |
Tolerance of desiccation was examined in three species of moss, Grimmia antarctici Card., Ceratodon purpureus (Hedw.) Brid. and Bryum pseudotriquetrum (Hedw.) Gaertn., Meyer et Scherb. collected from two sites of contrasting water availability in the Windmill Islands, continental Antarctica. Physiological tolerance to desiccation was measured using chlorophyll fluorescence in plugs of moss during natural drying in the laboratory. Differences in relative water contents, rates of drying and the response of photosynthesis to desiccation were observed among the three species and between sites. Of the three species studied, G. antarctici showed the lowest capacity to sustain photosynthetic processes during desiccation, B. pseudotriquetrum had an intermediate response and showed the greatest plasticity and C. purpureus showed the greatest capacity to sustain photosynthesis during desiccation. These results fit well with the known distribution of the three species with G. antarctici being limited to relatively wet sites, C. purpureus being common in the driest sites and B. pseudotriquetrum showing a wide distribution between these two extremes. Levels of soluble carbohydrates were also measured in these samples following desiccation and these indicate the presence of stachyose, an oligosaccharide known to be important in desiccation tolerance in seeds, in B. pseudotriquetrum. Both gross morphology and carbohydrate content are likely to contribute to differences in desiccation tolerance of the moss species. These results indicate that if the Casey region continues to dry out, as a result of local geological uplifting or global climate change, we would expect to see not only reductions in the moss community but also changes in community composition. Grimmia antarctici is likely to become more limited in distribution as C. purpureus and B. pseudotriquetrum expand into drying areas |
format |
Article in Journal/Newspaper |
author |
Robinson, Sharon A. Wasley, J. Popp, M. Lovelock, C. E. |
author_facet |
Robinson, Sharon A. Wasley, J. Popp, M. Lovelock, C. E. |
author_sort |
Robinson, Sharon A. |
title |
Desiccation tolerance of three moss species from continental Antarctica |
title_short |
Desiccation tolerance of three moss species from continental Antarctica |
title_full |
Desiccation tolerance of three moss species from continental Antarctica |
title_fullStr |
Desiccation tolerance of three moss species from continental Antarctica |
title_full_unstemmed |
Desiccation tolerance of three moss species from continental Antarctica |
title_sort |
desiccation tolerance of three moss species from continental antarctica |
publisher |
Research Online |
publishDate |
2000 |
url |
https://ro.uow.edu.au/scipapers/49 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1053&context=scipapers |
long_lat |
ENVELOPE(110.417,110.417,-66.350,-66.350) |
geographic |
Windmill Islands |
geographic_facet |
Windmill Islands |
genre |
Antarc* Antarctica Grimmia antarctici Windmill Islands |
genre_facet |
Antarc* Antarctica Grimmia antarctici Windmill Islands |
op_source |
Faculty of Science - Papers (Archive) |
op_relation |
https://ro.uow.edu.au/scipapers/49 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1053&context=scipapers |
_version_ |
1766259221405368320 |