Change in transmittance in the PAR (400 - 700 nm) of leaves in response to 1 h illumination with high blue light. Experiments performed on dark adapted leaves of Vaccinium myrtillus, Homogyne alpina (new leaves) and Soldanella carpatica (overwintered leaves) collected in the Tatra Mountains.

Change in transmittance in the PAR (400 - 700 nm) of leaves in response to 1 h illumination with high blue light (peak at ca. 450 nm, 100 umol/m^2/s). Experiments performed on dark adapted leaves of Vaccinium myrtillus, Homogyne alpina (new leaves) and Soldanella carpatica (overwintered leaves) collected at different sites in the Tatra Mountains:understorey (Jaworzynka Valley, 1080 m asl, 1125 m asl), clearing (Jaworzynka Valley, 1080 m asl, 1125 m asl), subalpine (Hala Gasienicowa, 1615 m asl), and peak alpine (Liliowe Pass, 1970 m asl) sites. Measurements of transmittance were recorded from the adaxial leaf side using a Jaz Spectro-Clip (<i>Ocean Optics, </i><i>Dunedin, USA</i>). A xenon light source provided a pulse of light at a trigger rate of 10 ms.