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Acclimation of Norway spruce photosynthetic apparatus to the combined effect of high irradiance and temperature
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SYSNO ASEP 0358656 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Acclimation of Norway spruce photosynthetic apparatus to the combined effect of high irradiance and temperature Author(s) Štroch, M. (CZ)
Vrábl, D. (CZ)
Podolinská, J. (CZ)
Kalina, J. (CZ)
Urban, Otmar (UEK-B) RID, ORCID, SAI
Špunda, V. (CZ)Source Title Journal of Plant Physiology. - : Elsevier - ISSN 0176-1617
Roč. 167, č. 8 (2010), s. 597-605Number of pages 9 s. Language eng - English Country PT - Portugal Keywords diurnal courses ; picea abies ; thermal acclimation ; thermal energy dissipation ; xanthophyll cycle Subject RIV ED - Physiology R&D Projects GA522/07/0759 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z60870520 - UEK-B (2005-2011) UT WOS 000278019200002 DOI 10.1016/j.jplph.2009.11.011 Annotation Diurnal courses of photosynthetic parameters, chlorophyll fluorescence and de-epoxidation state of xanthophyll cycle pigments (DEPS) were measured during the acclimation of spruce seedlings to regimes simulated cold cloudy days (LI treatment), cold sunny days (HI), and hot sunny days (HI-HT). Acclimation to HI and HI-HT led to a strong depression in CO2 assimilation (AN), particularly during noon and afternoon. Insufficient stomatal conductance was the main reason of reduced AN. Negligible changes in maximum photochemical efficiency of photosystem (PS) II support the resistance of spruce against PSII photoinhibition. The HI plants had higher content of xanthophyll cycle pigments (VAZ) and enhanced efficiency of thermal energy dissipation (D) that correlated with DEPS. In contrast, HI-HT plants had significantly lower D and DEPS values than HI plants. These results indicate a minor role of the xanthophyll-mediated thermal dissipation in PSII photoprotection under elevated temperatures. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2012
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