Effect of cold acclimation on the photosynthetic performance of two ecotypes of Colobanthus quitensis (Kunth) Bartl

Effect of cold acclimation on the photosynthetic performance of two ecotypes of Colobanthus quitensis (Kunth) Bartl

The effects of cold acclimation of two ecotypes (Antarctic and Andes) of Colobanthus quitensis (Kunth) Bartl. Caryophyllaceae on their photosynthetic characteristics and performance under high light (HL) were compared. Non-acclimated plants of the Antarctic ecotype exhibited a higher (34%) maximal r...

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Bibliographic Details
Published in:Journal of experimental botany Vol. 58; no. 13; pp. 3581 - 3590
Main Authors: Bravo, León A, Saavedra-Mella, Felipe A, Vera, Felipe, Guerra, Alexi, Cavieres, Lohengrin A, Ivanov, Alexander G, Huner, Norman P.A, Corcuera, Luis J
Format: Journal Article
Language:English
Published: Oxford Oxford University Press 2007
Oxford Publishing Limited (England)
Subjects:
Acclimatization
Acclimatization - physiology
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
Antarctic plants
Antarctic Regions
Biological and medical sciences
Caryophyllaceae - physiology
Chlorophylls
Climatic adaptation. Acclimatization
Cold Temperature
Ecosystem
Fluorescence
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
heat dissipation
Low temperature
non-photochemical quenching
Photoinhibition
Photons
Photosynthesis
Photosynthesis - physiology
Pigments
Plants
Research Papers
South America
Xanthophylls
Antarctic Regions
South America
Antarctic plants
non-photochemical quenching
photoinhibition
low temperature
photosynthesis
heat dissipation
Cold
Photoinhibition
Photosynthesis
Low temperature
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Summary:The effects of cold acclimation of two ecotypes (Antarctic and Andes) of Colobanthus quitensis (Kunth) Bartl. Caryophyllaceae on their photosynthetic characteristics and performance under high light (HL) were compared. Non-acclimated plants of the Antarctic ecotype exhibited a higher (34%) maximal rate of photosynthesis than the Andes ecotype. In cold-acclimated plants the light compensation point was increased. Dark respiration was significantly increased during the exposure to 4 °C in both ecotypes. Cold-acclimated Antarctic plants showed higher ΦPSII and qP compared with the Andes ecotype. In addition, the Antarctic ecotype exhibited higher heat dissipation (NPQ), especially in the cold-acclimated state, which was mainly associated with the fast relaxing component of non-photochemical quenching (NPQF). By contrast, the Andes ecotype exhibited a lower NPQF and a significant increase in the slowly relaxing component (NPQs) at low temperature and HL, indicating higher sensitivity to low temperature-induced photoinhibition. Although the xanthophyll cycle was fully operational in both ecotypes, cold-acclimated Antarctic plants exposed to HL exhibited higher epoxidation state of the xanthophyll cycle pigments (EPS) compared with the cold-acclimated Andes ecotype. Thus, the photosynthetic apparatus of the Antarctic ecotype operates more efficiently than that of the Andes one, under a combination of low temperature and HL. The ecotype differences are discussed in relation to the different climatic conditions of the two Colobanthus.
Bibliography:ark:/67375/HXZ-0B4DZKT9-D
istex:E5EA432E01F0F38B09E4D7F2A0DEBFBFFB919A1B
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erm206