The dynamics of some parameters of leaf growth and photosynthetic apparatus activity of winter and spring wheat plants at temperature of 4оС were studied. At first day of cooling we demonstrated the leaf growth retardation and decrease of chlorophyll content and electron transport as well as increase in nonphotochemical quenching of chlorophyll fluorescence in winter wheat plants. Then cold resistance of leaf cells of winter wheat increased, the rate of electron transport stabilized, chlorophyll content and nonphotochemical quenching of chlorophyll fluorescence increased, and plant growth was resumed. The spring wheat characterized the lower tolerance level, changes in photosynthetic apparatus and leaf growth at temperature of 4.С.