Low and high temperature dependence of minimum F0 and maximum FM chlorophyll fluorescence in vivo

The aim of this paper is to give a global insight into the behaviour of F0 and FM in a wide temperature range from −100°C to 75°C. We show that the F0 increases upon linear freezing, similarly to the widely published increase of the F0 upon linear heating. In contrast to this the FM decreases upon linear heating in the whole temperature range from −100°C to 75°C. A comparison of low and high temperature induced increase of the F0 is presented.