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Kuiper, D. and Steingrover, E.G. 1989. Responses of growth, shoot to root ratio and cytokinin concentrations in root tissue of two barley varieties, differing in their salt resistance. Two varieties of barley, differing in their salt tolerance, were subjected to four different treatments. Plants were grown under control conditions plus or minus addition of benzyladenine and on saline nutrients solutions plus or minus benzyladenine. The salt resistant variety showed rapid responses after exposure to salt. Shoot growth and shoot to root ratio in this variety decreased. However, the addition of benzyladenine could overcome temporarily the salt induced effects. Concentrations of several cytokinins in the roots of the salt resistant variety correlated with the growth responses. Growth responses of plants of a salt sensitive variety to a salt treatment were very slow and no effects of salt on shoot to root ratio and on cytokinin concentrations were noticed. Benzyladenine affected growth adversely in plants of this variety. The results are discussed in connection to a growth-regulation model.