Features of adaptive reactions to low freezing temperatures of plants of different systematic groups

By means of methods of registration of parameters of fast and delay fluorescence at low positive and freezing temperatures the seasonal dynamics of photosynthetic activity and the structural organization of the pigmentary device of the plants of various systematic groups growing in the territory of the nature reserve «Stolby» were studied. It was established that, unlike gymnosperms and angiospermous, cryptogam plants have no phase of deep winter dormancy regulated by phytohormones.