The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum
Green aboveground shoots of the moss Polytrichum alpinum Hedw., growing on the tundra at Point Barrow, Alaska, were exposed to 14 CO 2 in the field. Autoradiography and subsequent counting revealed preferential translocation of the labeled compounds into new belowground shoots arising from the exten...
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Language: | English |
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Canadian Science Publishing
1974
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Online Access: | http://dx.doi.org/10.1139/b74-048 http://www.nrcresearchpress.com/doi/pdf/10.1139/b74-048 |
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crcansciencepubl:10.1139/b74-048 2023-12-17T10:27:54+01:00 The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum Collins, N. J. Oechel, W. C. 1974 http://dx.doi.org/10.1139/b74-048 http://www.nrcresearchpress.com/doi/pdf/10.1139/b74-048 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 52, issue 2, page 355-363 ISSN 0008-4026 Plant Science journal-article 1974 crcansciencepubl https://doi.org/10.1139/b74-048 2023-11-19T13:38:59Z Green aboveground shoots of the moss Polytrichum alpinum Hedw., growing on the tundra at Point Barrow, Alaska, were exposed to 14 CO 2 in the field. Autoradiography and subsequent counting revealed preferential translocation of the labeled compounds into new belowground shoots arising from the extensive underground stem system. Within 24 h all stem systems extracted had been labeled throughout, a maximum distance of 7.5 cm being covered in this time, indicating minimum rates of 3.1 mm h −1 .Increases in the number of new shoots aboveground throughout the season revealed the extent and importance of this translocation. Innate markers of seasonal growth enabled ages of the shoots at two sites to be determined and also the ages of shoots at production of gametangia in a third site where fruiting was common. The relative photosynthetic rates of the successive seasons' growth were also determined, and showed that by the 3rd year the photosynthetic capacity had dropped to about 40% of that in the youngest tissue on the same shoot.The patterns of growth and translocation of photosynthate in Polytrichum alpinum are discussed in relation to survival on the tunda. Article in Journal/Newspaper Barrow Point Barrow Tundra Alaska Canadian Science Publishing (via Crossref) Canadian Journal of Botany 52 2 355 363 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
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Plant Science Collins, N. J. Oechel, W. C. The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
topic_facet |
Plant Science |
description |
Green aboveground shoots of the moss Polytrichum alpinum Hedw., growing on the tundra at Point Barrow, Alaska, were exposed to 14 CO 2 in the field. Autoradiography and subsequent counting revealed preferential translocation of the labeled compounds into new belowground shoots arising from the extensive underground stem system. Within 24 h all stem systems extracted had been labeled throughout, a maximum distance of 7.5 cm being covered in this time, indicating minimum rates of 3.1 mm h −1 .Increases in the number of new shoots aboveground throughout the season revealed the extent and importance of this translocation. Innate markers of seasonal growth enabled ages of the shoots at two sites to be determined and also the ages of shoots at production of gametangia in a third site where fruiting was common. The relative photosynthetic rates of the successive seasons' growth were also determined, and showed that by the 3rd year the photosynthetic capacity had dropped to about 40% of that in the youngest tissue on the same shoot.The patterns of growth and translocation of photosynthate in Polytrichum alpinum are discussed in relation to survival on the tunda. |
format |
Article in Journal/Newspaper |
author |
Collins, N. J. Oechel, W. C. |
author_facet |
Collins, N. J. Oechel, W. C. |
author_sort |
Collins, N. J. |
title |
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
title_short |
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
title_full |
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
title_fullStr |
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
title_full_unstemmed |
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum |
title_sort |
pattern of growth and translocation of photosynthate in a tundra moss, polytrichum alpinum |
publisher |
Canadian Science Publishing |
publishDate |
1974 |
url |
http://dx.doi.org/10.1139/b74-048 http://www.nrcresearchpress.com/doi/pdf/10.1139/b74-048 |
genre |
Barrow Point Barrow Tundra Alaska |
genre_facet |
Barrow Point Barrow Tundra Alaska |
op_source |
Canadian Journal of Botany volume 52, issue 2, page 355-363 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b74-048 |
container_title |
Canadian Journal of Botany |
container_volume |
52 |
container_issue |
2 |
container_start_page |
355 |
op_container_end_page |
363 |
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1785579864207654912 |