The treatment of intact cells of Spirullina platensis with low temperature (10-25°C) for 45 min caused inhibition in PS II catalysed electron transport activity .The light intensity measurements clearly gave an indication that light harvesting complex (Phycobilisomes) are targets for the cold stress. Low temperature effects the pigment-protein interaction and finally altered the energy transfer from phycocyanin to Chl a in the intact cells of Spirullina platensis which is evident from the both absorption and fluorescence emission measurements.
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