Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici
Abstract The impact of ambient ultraviolet (UV)‐B radiation on the endemic bryophyte, Grimmia antarctici , was studied over 14 months in East Antarctica. Over recent decades, Antarctic plants have been exposed to the largest relative increase in UV‐B exposure as a result of ozone depletion. We inves...
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crwiley:10.1111/j.1365-2486.2005.00911.x 2024-06-02T07:56:14+00:00 Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici Robinson, Sharon A. Turnbull, Johanna D. Lovelock, Catherine E. 2005 http://dx.doi.org/10.1111/j.1365-2486.2005.00911.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2005.00911.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2005.00911.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 11, issue 3, page 476-489 ISSN 1354-1013 1365-2486 journal-article 2005 crwiley https://doi.org/10.1111/j.1365-2486.2005.00911.x 2024-05-03T11:20:11Z Abstract The impact of ambient ultraviolet (UV)‐B radiation on the endemic bryophyte, Grimmia antarctici , was studied over 14 months in East Antarctica. Over recent decades, Antarctic plants have been exposed to the largest relative increase in UV‐B exposure as a result of ozone depletion. We investigated the effect of reduced UV and visible radiation on the pigment concentrations, surface reflectance and physiological and morphological parameters of this moss. Plexiglass screens were used to provide both reduced UV levels (77%) and a 50% decrease in total radiation. The screen combinations were used to separate UV photoprotective from visible photoprotective strategies, because these bryophytes are growing in relatively high light environments compared with many mosses. G. antarctici was affected negatively by ambient levels of UV radiation. Chlorophyll content was significantly lower in plants grown under near‐ambient UV, while the relative proportions of photoprotective carotenoids, especially β ‐carotene and zeaxanthin, increased. However, no evidence for the accumulation of UV‐B‐absorbing pigments in response to UV radiation was observed. Although photosynthetic rates were not affected, there was evidence of UV effects on morphology. Plants that were shaded showed fewer treatment responses and these were similar to the natural variation observed between moss growing on exposed microtopographical ridges and in more sheltered valleys within the turf. Given that other Antarctic bryophytes possess UV‐B‐absorbing pigments which should offer better protection under ambient UV‐B radiation, these findings suggest that G. antarctici may be disadvantaged in some settings under a climate with continuing high levels of springtime UV‐B radiation. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Grimmia antarctici Wiley Online Library Antarctic East Antarctica The Antarctic Global Change Biology 11 3 476 489 |
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Abstract The impact of ambient ultraviolet (UV)‐B radiation on the endemic bryophyte, Grimmia antarctici , was studied over 14 months in East Antarctica. Over recent decades, Antarctic plants have been exposed to the largest relative increase in UV‐B exposure as a result of ozone depletion. We investigated the effect of reduced UV and visible radiation on the pigment concentrations, surface reflectance and physiological and morphological parameters of this moss. Plexiglass screens were used to provide both reduced UV levels (77%) and a 50% decrease in total radiation. The screen combinations were used to separate UV photoprotective from visible photoprotective strategies, because these bryophytes are growing in relatively high light environments compared with many mosses. G. antarctici was affected negatively by ambient levels of UV radiation. Chlorophyll content was significantly lower in plants grown under near‐ambient UV, while the relative proportions of photoprotective carotenoids, especially β ‐carotene and zeaxanthin, increased. However, no evidence for the accumulation of UV‐B‐absorbing pigments in response to UV radiation was observed. Although photosynthetic rates were not affected, there was evidence of UV effects on morphology. Plants that were shaded showed fewer treatment responses and these were similar to the natural variation observed between moss growing on exposed microtopographical ridges and in more sheltered valleys within the turf. Given that other Antarctic bryophytes possess UV‐B‐absorbing pigments which should offer better protection under ambient UV‐B radiation, these findings suggest that G. antarctici may be disadvantaged in some settings under a climate with continuing high levels of springtime UV‐B radiation. |
format |
Article in Journal/Newspaper |
author |
Robinson, Sharon A. Turnbull, Johanna D. Lovelock, Catherine E. |
spellingShingle |
Robinson, Sharon A. Turnbull, Johanna D. Lovelock, Catherine E. Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
author_facet |
Robinson, Sharon A. Turnbull, Johanna D. Lovelock, Catherine E. |
author_sort |
Robinson, Sharon A. |
title |
Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
title_short |
Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
title_full |
Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
title_fullStr |
Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
title_full_unstemmed |
Impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the Antarctic moss, Grimmia antarctici |
title_sort |
impact of changes in natural ultraviolet radiation on pigment composition, physiological and morphological characteristics of the antarctic moss, grimmia antarctici |
publisher |
Wiley |
publishDate |
2005 |
url |
http://dx.doi.org/10.1111/j.1365-2486.2005.00911.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2005.00911.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2005.00911.x |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Grimmia antarctici |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Grimmia antarctici |
op_source |
Global Change Biology volume 11, issue 3, page 476-489 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2486.2005.00911.x |
container_title |
Global Change Biology |
container_volume |
11 |
container_issue |
3 |
container_start_page |
476 |
op_container_end_page |
489 |
_version_ |
1800754464308592640 |