Red pigments in autumn leaves of Norway maple do not offer significant photoprotection but coincide with stress symptoms.

A linear statistical model for the rate constant of photoinhibition ( k PI ) was highly significant ( F (8,95) = 50.3, P < 2.2 × 10 −16 ) and showed that k PI was significantly affected by light color (coefficient 0.70 ± 0.0095, P = 6.75 × 10 −11 ) and leaf group (coefficient 0.016 ± 0.0069, P = 0.0256) but not by the other variables (see Summary of statistics available as Supplementary data at Tree Physiology Online).

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Redness had a major positive effect on gH+ (effect size 6.75), but the effect was only barely significant ( P = 0.047, χ 2 = 3.96), whereas the effect of redness on vH+ was negative (effect size −0.52, P = 7.98 × 10 −11 , χ 2 = 46.5).

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A decreasing trend in F V / F M as a function of 530-nm absorbance was found.

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