Abstract
Polyamine composition is investigated in Lycopersicum esculentum Mill.cv. Ace 55 seedlings under constant and alternating temperature and lighting conditions. Growth of tomato seedlings is correlated with several changes in polyamine composition. Polyamine levels vary rhythmically. The diurnal rhythm of polyamine levels is primarily controlled by the temperature cycle and less influenced by the light program. Polyamine accumulation persists when the same temperature program is applied under continuous darkness. The endogenous rhythm in polyamine levels and composition is maintained under continous light at 25°C. These results suggest that polyamine changes are regulated endogenously, irrespective of immediate environmental conditions. It seems that under normal diurnal conditions of photo and thermoperiod with high polyamine levels during the night and low levels during the day, there is an optimal stabilization of chloroplast membranes.
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