Photosynthetic acclimation to high light conditions in mature leaves of Coffea arabica L.: role of xanthophylls, quenching mechanisms and nitrogen nutrition

By J. Ramalho, T. Pons, H. Groeneveld, H. Azinheira, M. Nunes. 2000

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Ecophysiological constraints on the production of shaded and unshaded coffee: a review. (2004, background): “The acclimation process involved an increase in non-photochemical quenching which apparently constituted the first line of defense against high irradiance (Ramalho et al., 1997, 2000a).”
The Potential of a Chlorophyll Content SPAD Meter to Quantify Nutrient Stress in Foliar Tissue of Sycamore (Acer pseudoplatanus), English Oak (Quercus robur), and European Beech (Fagus sylvatica) (2008, background): “…through de-epoxidation to give rise to anteroxanthin and finally zeaxanthin that, together with a low pH within the photosynthetic membrane, facilitate the harmless dissipation of excess excitation energy directly within the lightharvesting chlorophyll antennae (Havaux 1988; Ramalho et al. 2000).”
Effects of shade on growth, production and quality of coffee (COFFEA ARABICA) in Ethiopia (2011, background): “According to Fahl et al. (1994) and Ramalho et al. (2000), higher values of Fv/Fm obtained from shaded leaves can also be linked with higher leaf nitrogen content.”
Photosynthetic pigments, nitrogen, chlorophyll a fluorescence and SPAD-502 readings in coffee leaves (2005, background): “Zeaxanthin participates intensely in the regulation of heat dissipation of PSII energy, when this has an energetic overload (Ramalho et al., 2000; Ort, 2001).”