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Winter acclimation of PsbS and related proteins in the evergreen Arctostaphylos uva-ursi as influenced by altitude and light environment.
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2006 (English)In: Plant, Cell & Environment, ISSN 0140-7791, Vol. 29, no 5, 869-78 p.Article in journal (Refereed) Published
Abstract [en]

The evergreen groundcover bearberry (Arctostaphylos uva-ursi[L.] Sprengel) was characterized over two successive years (2002–2004) from both sun-exposed and shaded sites at a montane ponderosa pine and subalpine forest community of 1900- and 2800-m-high altitudes, respectively. During summer, photosynthetic capacities and pre-dawn photosystem II (PSII) efficiency were similarly high in all four populations, and in winter, only the sun-exposed and shaded populations at 2800 m exhibited complete down-regulation of photosynthetic oxygen evolution capacity and consistent sustained down-regulation of PSII efficiency. This photosynthetic down-regulation at high altitude involved a substantial decrease in PSII components [pheophytin, D1 protein, oxygen evolving complex ([OEC)], a strong up-regulation of several anti-early-light-inducible protein (Elip)- and anti-high-light-inducible protein (Hlip)-reactive bands and a warm-sustained retention of zeaxanthin and antheraxanthin (Z + A). PsbS, the protein modulating the rapid engagement and disengagement of Z + A in energy dissipation, exhibited its most pronounced winter increases in the shade at 1900 m, and thus apparently assumes a greater role in providing rapidly reversible zeaxanthin-dependent photoprotection during winter when light becomes excessive in the shaded population, which remains photosynthetically active. It is attractive to hypothesize that PsbS relatives (Elips/Hlips) may be involved in sustained zeaxanthin-dependent photoprotection under the more extreme winter conditions at 2800 m.

Place, publisher, year, edition, pages
2006. Vol. 29, no 5, 869-78 p.
Keyword [en]
Adaptation, Physiological, Altitude, Arabidopsis Proteins/*metabolism, Arctostaphylos/metabolism/*physiology, Cold, Electrophoresis, Polyacrylamide Gel, Fluorescence, Light, Photosynthesis, Photosynthetic Reaction Center Complex Proteins/*metabolism, Photosystem II Protein Complex/*metabolism, Seasons
URN: urn:nbn:se:umu:diva-14203DOI: doi:10.1111/j.1365-3040.2005.01466.xPubMedID: 17087470OAI: diva2:153874
Available from: 2007-05-24 Created: 2007-05-24 Last updated: 2015-04-29Bibliographically approved

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Jansson, Stefan
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)

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