The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica
Abstract The net photosynthetic rate (NP), chlorophyll fluorescence, carotenoid content and chlorophyll content of the cosmopolitan moss Bryum argenteum were measured in the field at Botany Bay, southern Victoria Land, continental Antarctica (77°S). Comparisons were made between sun- and shade-adapt...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2012
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s095410201200003x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201200003X |
id |
crcambridgeupr:10.1017/s095410201200003x |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s095410201200003x 2024-09-15T17:42:27+00:00 The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica Schroeter, B. Green, T.G.A. Kulle, Daniel Pannewitz, S. Schlensog, M. Sancho, L.G. 2012 http://dx.doi.org/10.1017/s095410201200003x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201200003X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 24, issue 3, page 281-291 ISSN 0954-1020 1365-2079 journal-article 2012 crcambridgeupr https://doi.org/10.1017/s095410201200003x 2024-07-03T04:03:31Z Abstract The net photosynthetic rate (NP), chlorophyll fluorescence, carotenoid content and chlorophyll content of the cosmopolitan moss Bryum argenteum were measured in the field at Botany Bay, southern Victoria Land, continental Antarctica (77°S). Comparisons were made between sun- and shade-adapted forms, and changes were followed as the moss emerged from under the snow and during exposure of shade and sun forms to ambient light. Shade forms had lower light compensation and saturation values for NP but little difference in maximal NP rates. Shade forms exposed to ambient light changed rapidly (within five days) towards the performance of the sun forms. Surprisingly, this change was not by acclimation of shoots but by the production of new shoots. Chlorophyll and carotenoid levels measured on a molar chlorophyll basis showed no difference between sun and shade forms and also little change during emergence. The constant molar relationship between carotenoids and chlorophyll plus the high levels of the xanthophyll cycle pigments suggest that protection of the chlorophyll antenna was constitutive. This is an adaptation to the very high light levels that occur when the plants are active in continental Antarctica and contrasts to the situation in more temperate areas where high light is normally avoided by desiccation. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Victoria Land Cambridge University Press Antarctic Science 24 3 281 291 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The net photosynthetic rate (NP), chlorophyll fluorescence, carotenoid content and chlorophyll content of the cosmopolitan moss Bryum argenteum were measured in the field at Botany Bay, southern Victoria Land, continental Antarctica (77°S). Comparisons were made between sun- and shade-adapted forms, and changes were followed as the moss emerged from under the snow and during exposure of shade and sun forms to ambient light. Shade forms had lower light compensation and saturation values for NP but little difference in maximal NP rates. Shade forms exposed to ambient light changed rapidly (within five days) towards the performance of the sun forms. Surprisingly, this change was not by acclimation of shoots but by the production of new shoots. Chlorophyll and carotenoid levels measured on a molar chlorophyll basis showed no difference between sun and shade forms and also little change during emergence. The constant molar relationship between carotenoids and chlorophyll plus the high levels of the xanthophyll cycle pigments suggest that protection of the chlorophyll antenna was constitutive. This is an adaptation to the very high light levels that occur when the plants are active in continental Antarctica and contrasts to the situation in more temperate areas where high light is normally avoided by desiccation. |
format |
Article in Journal/Newspaper |
author |
Schroeter, B. Green, T.G.A. Kulle, Daniel Pannewitz, S. Schlensog, M. Sancho, L.G. |
spellingShingle |
Schroeter, B. Green, T.G.A. Kulle, Daniel Pannewitz, S. Schlensog, M. Sancho, L.G. The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
author_facet |
Schroeter, B. Green, T.G.A. Kulle, Daniel Pannewitz, S. Schlensog, M. Sancho, L.G. |
author_sort |
Schroeter, B. |
title |
The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
title_short |
The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
title_full |
The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
title_fullStr |
The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
title_full_unstemmed |
The moss Bryum argenteumvar.muticum Brid. is well adapted to cope with high light in continental Antarctica |
title_sort |
moss bryum argenteumvar.muticum brid. is well adapted to cope with high light in continental antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1017/s095410201200003x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201200003X |
genre |
Antarc* Antarctic Science Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica Victoria Land |
op_source |
Antarctic Science volume 24, issue 3, page 281-291 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410201200003x |
container_title |
Antarctic Science |
container_volume |
24 |
container_issue |
3 |
container_start_page |
281 |
op_container_end_page |
291 |
_version_ |
1810489038700806144 |