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Photochemical quenching. a The parameters ΦPSII, q P, q L and q L(c) as a function of the actinic light intensity determined on wheat leaves. b The relationship between q P and q L is nonlinear especially at low light intensities (values close to 1), whereas the relationship between q L and q L(c) is linear with q L(c) systematically lower than q L (Živčák and Brestič, unpublished data)
