A Comparison of Photosynthetic Performance and Leaf Carbon Gain of Temperate and Subarctic Genotypes of Geum Rivale and Ranunculus Acris in Northern Sweden
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Media type:
E-Article
Title:
A Comparison of Photosynthetic Performance and Leaf Carbon Gain of Temperate and Subarctic Genotypes of Geum Rivale and Ranunculus Acris in Northern Sweden
Contributor:
Diemer, Matthias
imprint:
Munksgaard International Publishers Ltd., 1996
Description:
<p>Gas exchange characteristics and carbon gain of transplanted temperate zone and native subarctic Geum rivale and Ranunculus acris were evaluated in a common garden under a subarctic growth regime. Photosynthetic capacity (<tex-math>$\text{A}_{\text{cap}}$</tex-math>) and rates of dark respiration of temperate zone genotypes grown in the subarctic did not differ significantly from subarctic genotypes, indicating a significant amount of phenotypic adjustment, since<tex-math>$\text{A}_{\text{cap}}$</tex-math>of temperate zone genotypes were c. 40% higher in central Europe. Modelled daily leaf carbon balances in the subarctic summer were highest in subarctic genotypes, due to more efficient utilization of low quantum flux densities. Furthermore, temperate zone genotypes transplanted to the subarctic tended to have higher daily leaf carbon balances, than at their latitudinal origin in central Europe. Since neither functional leaf lifespans nor the ratio of assimilatory to non-assimilatory tissues differed appreciably among subarctic and transplanted temperate zone genotypes, it is unlikely that southern provenances attain greater plant carbon balances in the subarctic, than native genotypes. Based on these data it is unlikely that subarctic provenances will be replaced by temperate zone forb genotypes, in the course of proposed poleward migrations of plants associated with climatic warming.</p>