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Lütz, C.

Avoidance of photoinhibition and examples of photodestruction in high Alpine Eriophorum.

J. Plant Physiol. 148, 120-128 (1996)
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
The ecological adaptation of plant development and of the photosynthetic apparatus to contrasting temperature regimes and strong irradiation is studied with plants growing at high alpine locations. Higher plants, surviving between 2000 m and 4000 m altitude in the Alps have developed mechanisms which avoid freezing damage as well as photodestruction. The following studies were made with Eriophorum angustifolium plants which develop «etiolated» leaves already under snow and allow to examine simultaneously the whole sequence of greening of plants growing in a distance of a few meters. We investigated plant development and ecophysiology of photosynthesis as it occurs in the field under high irradiance at cloudless days, which can easily change to low light conditions, often under a snow cover. In green leaves of Eriophorum a sudden frost period with snow fall followed by strong irradiation leads to yellow coloured leaf areas, which regreen very slowly. Most of the thylakoids disintegrate and form clumped aggregates, indicating the breakdown of mainly chlorophylls and their binding proteins. Even high amounts of zeaxanthin in the affected leaf parts cannot avoid the damage. While hydrophilic antioxidants (glutathione, ascorbate) seem not to be directly involved in the destruction, β-carotene and α-tocopherol decrease. Development of photosynthesis in some high alpine plants such as Eriophorum is retarded until favourable temperature conditions for use of photosynthetic products are present. In contrast, occasional weather changes, as common in alpine environments, can cause strong destructions in leaves and give an idea about the consequences if the observed adaptive retardation would not have been developed by adaptation.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Alpine Plants ; Chilling ; Eriophorum ; Greening ; Photoinhibition ; Pigments ; Ultrastructure
ISSN (print) / ISBN 0176-1617
e-ISSN 1618-1328
Zeitschrift Journal of Plant Physiology
Quellenangaben Band: 148, Heft: 1-2, Seiten: 120-128 Artikelnummer: , Supplement: ,
Verlag Elsevier
Begutachtungsstatus Peer reviewed
Institut(e) Abteilung Biophysikalische Strahlenforschung