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Title

Variations in Quercus ilex chloroplast pigment content during summer stress: involvement in photoprotection according to Principal Component Analysis

AuthorsLlorens, Laura; Aranda, Xavier; Abadía Bayona, Anunciación ; Fleck, Isabel
KeywordsXanthophyll cycle
Quercus ilex
Principal component analysis
Photoprotection
Lutein-5,6-epoxide
Chlorophyll
Issue Date14-Jan-2002
PublisherCSIRO Publishing
CitationFunctional Plant Biology 29 (1): 81-88 (2002)
AbstractWe examined chloroplast pigment variation in holm oak (Quercus ilex L.) leaves for two periods under two climatic conditions, at midday during summer. We compared variation between control (unburned) plants and plants burned the preceding summer, since post-fire resprouts show higher photosynthetic rates and lower thermal energy dissipation. Principal component (PC) analysis was performed on nine pigment-content variables for the two periods separately. Two PC factors (PC1 and PC2) explained 83 and 84% of the variance of the data for each period. In both periods, PC1 was marked by positive loading of pigments associated with light absorption or structural function namely neoxanthin, lutein, β-carotene, chlorophyll a, and chlorophyll b. These pigments were only affected by leaf age. In contrast, PC2 was marked by high loadings of xanthophyll-cycle pigments (associated with photoprotection), and lutein-5,6-epoxide. Leaf content of these pigments was affected by climatic conditions. In the situations considered in PC analysis (leaf types, periods), the lutein-5,6-epoxide content presented a variation pattern similar to that of violaxanthin, and was significantly correlated with thermal dissipation of excess energy (represented by non-photochemical quenching or NPQ). These results suggest a relationship of lutein and lutein-5,6-epoxide with photoprotection.
Publisher version (URL)http://dx.doi.org/10.1071/PP01080
URIhttp://hdl.handle.net/10261/99405
DOI10.1071/PP01080
Identifiersdoi: 10.1071/PP01080
issn: 1445-4408
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