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Salt Adaptation of the Cyanobacterium Synechococcus 6311 Growing in a Continuous Culture (Turbidostat)

Department of Agricultural Botany, Faculty of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel

Physiological aspects of salt-adaptation in the cyanobacterium Synechococcus 6311 growing in a continuous culture (turbidostat) were studied. The process of salt-adaptation was completed within 3 days, as expressed by the specific growth rate of cells grown in the presence of 0.2 and 0.4 molar NaCl. An increase in photosynthetic activity during the adaptation period leads to the accumulation of soluble sugars, essential for osmoregulation in the salt-grown cells. Cells grown in the presence of 0.4 molar NaCl showed an initial inhibition in the rate of protein synthesis which was enhanced after the 1st day of salt stress. After adaptation, salt-grown cells showed an increase in phycobiliprotein synthesis and a higher phycobiliprotein to protein ratio.