Exploration of Chlorophyll a Fluorescence and Plant Gas Exchange Parameters as Indicators of Drought Tolerance in Perennial Ryegrass. - Piotr Dabrowski; Aneta H. Baczewska-Dabrowska; Hazem M. Kalaji; Vasilij Goltsev; Momchil Paunov; Marcin Rapacz; Magdalena Wójcik-Jagla; Bogumila Pawluskiewicz; Wojciech Baba; Marian Brestic (Sensors, 2019)