Ecophysiological analysis of two arctic sedges under reduced root temperatures
Shoot physiological activity in arctic vascular plants may be controlled by low soil temperatures. While leaves may be exposed to moderate temperatures during the growing season, root temperatures often remain near freezing. In this study, two tundra sedges, Eriophorum vaginatum and Carex bigellowii...
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crwiley:10.1111/j.0031-9317.2004.00260.x 2024-06-02T08:01:09+00:00 Ecophysiological analysis of two arctic sedges under reduced root temperatures Starr, Gregory Neuman, Dawn S. Oberbauer, Steven F. 2004 http://dx.doi.org/10.1111/j.0031-9317.2004.00260.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0031-9317.2004.00260.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0031-9317.2004.00260.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Physiologia Plantarum volume 120, issue 3, page 458-464 ISSN 0031-9317 1399-3054 journal-article 2004 crwiley https://doi.org/10.1111/j.0031-9317.2004.00260.x 2024-05-03T10:39:22Z Shoot physiological activity in arctic vascular plants may be controlled by low soil temperatures. While leaves may be exposed to moderate temperatures during the growing season, root temperatures often remain near freezing. In this study, two tundra sedges, Eriophorum vaginatum and Carex bigellowii , were subjected to reduced soil temperatures, and photosynthetic parameters (light saturated photosynthesis A max , variable to maximal fluorescence and F v / F m stomatal conductance) and abscisic acid concentrations were determined. Stomatal conductance and A max for both E. vaginatum and C. bigellowii strongly decreased with declining soil temperatures. Decreasing soil temperature, however, impacted F v / F m to a much lesser degree. Root and leaf ABA concentrations increased with decreasing root temperature. These observations support the contention that soil temperature is a significant photosynthetic driving factor in arctic sedges exposed to variable root and shoot temperatures. Because these two species comprise approximately 30% of the vascular ground cover of wet tussock tundra, the soil temperature responses of these sedges potentially scale up to significant effects on ecosystem carbon exchange. Article in Journal/Newspaper Arctic Eriophorum Tundra Wiley Online Library Arctic Physiologia Plantarum 120 3 458 464 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Shoot physiological activity in arctic vascular plants may be controlled by low soil temperatures. While leaves may be exposed to moderate temperatures during the growing season, root temperatures often remain near freezing. In this study, two tundra sedges, Eriophorum vaginatum and Carex bigellowii , were subjected to reduced soil temperatures, and photosynthetic parameters (light saturated photosynthesis A max , variable to maximal fluorescence and F v / F m stomatal conductance) and abscisic acid concentrations were determined. Stomatal conductance and A max for both E. vaginatum and C. bigellowii strongly decreased with declining soil temperatures. Decreasing soil temperature, however, impacted F v / F m to a much lesser degree. Root and leaf ABA concentrations increased with decreasing root temperature. These observations support the contention that soil temperature is a significant photosynthetic driving factor in arctic sedges exposed to variable root and shoot temperatures. Because these two species comprise approximately 30% of the vascular ground cover of wet tussock tundra, the soil temperature responses of these sedges potentially scale up to significant effects on ecosystem carbon exchange. |
format |
Article in Journal/Newspaper |
author |
Starr, Gregory Neuman, Dawn S. Oberbauer, Steven F. |
spellingShingle |
Starr, Gregory Neuman, Dawn S. Oberbauer, Steven F. Ecophysiological analysis of two arctic sedges under reduced root temperatures |
author_facet |
Starr, Gregory Neuman, Dawn S. Oberbauer, Steven F. |
author_sort |
Starr, Gregory |
title |
Ecophysiological analysis of two arctic sedges under reduced root temperatures |
title_short |
Ecophysiological analysis of two arctic sedges under reduced root temperatures |
title_full |
Ecophysiological analysis of two arctic sedges under reduced root temperatures |
title_fullStr |
Ecophysiological analysis of two arctic sedges under reduced root temperatures |
title_full_unstemmed |
Ecophysiological analysis of two arctic sedges under reduced root temperatures |
title_sort |
ecophysiological analysis of two arctic sedges under reduced root temperatures |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1111/j.0031-9317.2004.00260.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0031-9317.2004.00260.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0031-9317.2004.00260.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Eriophorum Tundra |
genre_facet |
Arctic Eriophorum Tundra |
op_source |
Physiologia Plantarum volume 120, issue 3, page 458-464 ISSN 0031-9317 1399-3054 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.0031-9317.2004.00260.x |
container_title |
Physiologia Plantarum |
container_volume |
120 |
container_issue |
3 |
container_start_page |
458 |
op_container_end_page |
464 |
_version_ |
1800745444596252672 |