Dynamics of the xanthophyll cycle and non-radiative dissipation of absorbed light energy during exposure of Norway spruce to high irradiance
Language English Country Germany Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
17761355
DOI
10.1016/j.jplph.2007.03.013
PII: S0176-1617(07)00157-5
Knihovny.cz E-resources
- MeSH
- Absorption MeSH
- Time Factors MeSH
- Chlorophyll A MeSH
- Chlorophyll metabolism MeSH
- Epoxy Compounds metabolism MeSH
- Fluorescence MeSH
- Photosynthesis radiation effects MeSH
- Photosystem II Protein Complex metabolism MeSH
- Lutein metabolism MeSH
- Carbon Dioxide metabolism MeSH
- Picea metabolism radiation effects MeSH
- Light * MeSH
- Electron Transport radiation effects MeSH
- Xanthophylls metabolism MeSH
- Zeaxanthins MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Geographicals
- Norway MeSH
- Names of Substances
- Chlorophyll A MeSH
- Chlorophyll MeSH
- Epoxy Compounds MeSH
- Photosystem II Protein Complex MeSH
- Lutein MeSH
- neoxanthin MeSH Browser
- Carbon Dioxide MeSH
- violaxanthin MeSH Browser
- Xanthophylls MeSH
- Zeaxanthins MeSH
The response of Norway spruce saplings (Picea abies [L.] Karst.) was monitored continuously during short-term exposure (10 days) to high irradiance (HI; 1000micromol m(-2)s(-1)). Compared with plants acclimated to low irradiance (100micromol m(-2)s(-1)), plants after HI exposure were characterized by a significantly reduced CO(2) assimilation rate throughout the light response curve. Pigment contents varied only slightly during HI exposure, but a rapid and strong response was observed in xanthophyll cycle activity, particularly within the first 3 days of the HI treatment. Both violaxanthin convertibility under HI and the amount of zeaxanthin pool sustained in darkness increased markedly under HI conditions. These changes were accompanied by an enhanced non-radiative dissipation of absorbed light energy (NRD) and the acceleration of induction of both NRD and de-epoxidation of the xanthophyll cycle pigments. We found a strong negative linear correlation between the amount of sustained de-epoxidized xanthophylls and the photosystem II (PSII) photochemical efficiency (F(V)/F(M)), indicating photoprotective down-regulation of the PSII function. Recovery of F(V)/F(M) at the end of the HI treatment revealed that Norway spruce was able to cope with a 10-fold elevated irradiance due particularly to an efficient NRD within the PSII antenna that was associated with enhanced violaxanthin convertibility and a light-induced accumulation of zeaxanthin that persisted in darkness.
References provided by Crossref.org
Unique organization of photosystem II supercomplexes and megacomplexes in Norway spruce
