Nom du corpus

Corpus Systématique Végétale

Titre du document

Photosynthetic response of the Antarctic moss Polytrichum alpestre Hoppe to low temperatures and freeze-thaw stress

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Syst_veg6_v2_017528
Auteur(s)
  • Andrew D. Kennedy
Affiliation(s)
  • British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, CB3 OET, Cambridge, UK
Résumé

The effect of low temperatures and freeze-thaw stress on photosynthetic carbon exchange in an Antarctic population of the turf-forming moss species Polytrichum alpestre Hoppe was investigated using infra-red gas analysis. Photosynthetic recovery from freezing was found to depend on the absolute depth of low temperature experienced. Repeated freeze-thaw cycles caused a greater reduction in gross photosynthesis than constant freezing over the same period of time suggesting that the freeze-thaw event itself, and not just cold temperatures, causes damage. The frequency of freeze-thaw events was significant: freeze-thaw cycles every 12 h inflicted more damage than freezethaw cycles every 24 or 48 h. Most damage occurred during the first cycle; relatively little was recorded during subsequent cycles. At +10°C, gross CO2 flux was directly proportional to moss water content between 0.3 and 3.5 g·g−1 dry mass. Moss samples with a low water content withstood freeze-thaw cycles to -5, -10 and-20°C better than samples with a high water content indicating that desiccation in the field may improve survival at low temperatures. Microclimate data for field populations of Polytrichum alpestre at Signy Island suggest that sub-zero temperatures and freeze-thaw stress may act as limiting factors on the species' distribution and viability, particularly when the insulating effect of snow cover is small.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - phytopathologie. zoologie agricole. protection des cultures et des forets
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - General Agricultural and Biological Sciences
Catégories WoS
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - biodiversity conservation
Identifiant ISTEX
039304E761106422F3DCC690FF872D0DECD72E18
Revue

Polar Biology

Année de publication
1993
Présence de XML structuré
Non
Score qualité du texte
9.496
Version PDF
1.3
Type de publication
Journal
ark:/67375/1BB-0Q0N96D6-5
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