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Winter acclimation ...
Winter acclimation of PsbS and related proteins in the evergreen Arctostaphylos uva-ursi as influenced by altitude and light environment.
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Zarter, C Ryan (författare)
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Adams, William W (författare)
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Ebbert, Volker (författare)
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Adamska, Iwona (författare)
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- Jansson, Stefan (författare)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)
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Demmig-Adams, Barbara (författare)
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(creator_code:org_t)
- Wiley, 2006
- 2006
- Engelska.
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Ingår i: Plant, Cell & Environment. - : Wiley. - 0140-7791 .- 1365-3040. ; 29:5, s. 869-78
- Relaterad länk:
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http://www.ncbi.nlm....
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https://onlinelibrar...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- 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
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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