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Conversion state of the xanthophyll cycle pool to zeaxanthin (Z) or zeaxanthin + antheraxanthin (A) under full sun (1600 µmol photons m−2 s−1) in fronds of Lemna minor (orange) and leaves of Malva neglecta (green) growing naturally in Superior, CO, USA. Mean values ± standard deviations; n = 4. Significant differences are denoted by asterisks; ** = p < 0.01, *** = p < 0.001. V = violaxanthin.
