Impact of heat pretreatment of 38°C followed by combined heat and high light treatments on chlorophyll fluorescence.

A.) 38°C+ 41°C/1200μmol m^-2 s^-1, B.) 38°C+ 43°C/1200μmol m^-2 s^-1 C.) 38°C+ 45°C/1200μmol m^-2 s^-1. Control measurements are in red. Measurements taken immediately after stress treatments are in blue and measurements taken after a five day recovery period are in green. Species abbreviations are the same as Fig 4.