Fig. 1From: The effects of chilling-light stress on photosystems I and II in three Paphiopedilum speciesChanges in F v /F m in three species of Paphiopedilum during chilling treatment at 4 °C under photosynthetic flux densities of 500 (a) or 200 (b) μmol photons m−2 s−1. Mean ± SE was calculated from six independent plants per speciesBack to article page