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. 2019 May 28;116(24):11640–11645. doi: 10.1073/pnas.1900278116

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Fig. 4. — Correlation plots of weekly average far-red SIF against needle measurements of foliar pigment composition and PAM fluorescence. (A) Total xanthophyll cycle pigment pool (V+A+Z μmol·g⁻¹). (B) Sustained retention of zeaxanthin and antheraxanthin after dark adaptation represented by the xanthophyll cycle conversion state ([Z+A]/[V+A+Z]). (C) Maximum quantum efficiency in the dark (F_v/F_m) measured by a fluorimeter. (D) Photosystem II operating efficiency (θPSII) at a photosynthetically active radiation (PAR) level of 500 μmol·m⁻²·s⁻¹, derived during a light response curve. Shaded regions indicate a 95% confidence interval around the line of best fit. All relationships are statistically significant at P < 0.05.