Maximum photochemical yield of photosystem II (<i>F</i><sub>v</sub>/<i>F</i><sub>m</sub>) measured in leaves of Vaccinium myrtillus, Homogyne alpina and Soldanella carpatica (overwintered leaves).
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The maximum photochemical yield of photosystem II (<i>F</i><sub>v</sub>/<i>F</i><sub>m</sub>) measured using a FluorPen FR100 (<i>Photon Systems Instruments [PSI], Drásov, Czech Republic</i>) in leaves of Vaccinium myrtillus, Homogyne alpina and Soldanella carpatica (overwintered leaves), growing in the Tatra Mountains (Poland). Measurements were taken for plants growing in the understorey (Jaworzynka Valley, 1080 m asl, 1125 m asl), clearing (Jaworzynka Valley, 1080 m asl, 1125 m asl), subalpine (Hala Gasienciowa, 1615 m asl), and peak alpine (Liliowe Pass, 1970 m asl) sites.Twenty leaves of each species at each site were 30 min dark-adapted <i>in situ</i> using leaf clips prior to a saturating pulse of 2700 μmol m<sup>-2</sup> s<sup>-1</sup> irradiance at 470 nm wavelength.
