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Salinity is one of the most important abiotic stresses that challenges plant growth and development. Crops are glycophytes and salinity causes important losses in agriculture. One of the approaches to reduce salinity impact is to increase crop salt tolerance by transferring genetic determinants important for salt tolerance from halophytes to crop species. These determinants may be identified by comparative studies in model species that differ in their salt tolerance. Thus, some recent studies have been focused on the comparison of Arabidopsis thaliana and Thellungiella halophila. To further gain insights into mechanisms important for salt tolerance we present here a comparative study of salt tolerance in these two species. This study is performed in plants growing hydroponically with salinity under steady-state conditions, allowing a characterization of K⁺/Na⁺ homeostasis under conditions that are closer to those that …