Abstract
Delayed fluorescence of chlorophyll in the time range of 3–18 ms was studied in intact spruce needles. The temperature dependence of delayed fluorescence was measured during cold deacclimation and after artificial dehardening of the frostresistant P. abies and the frost-susceptible P. schrenkiana. After dehardening of the needles as well as during release of deep rest there is an increase in the intensity of delayed fluorescence emission accompanied by simultaneous lowering of the temperature maximum of delayed fluorescence. Both of the responses are larger in the frost-susceptible P. schrenkiana responds to dehardening more strongly. The relation between cold deacclimation of the spruce needles and photosynthetic electron transport is discussed.
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