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The salinity tolerances of 21 accessions belonging to four wild tomato species  [Lycopersicon pimpinellifolium  (Jusl.) Mill.,  L. peruvianum  (Corr.) D'Arcy,  L. hirsutum  (L.) Mill., and  L. pennellii  Humb. Bonpl.) were evaluated using their vegetative yield-salinity response curves at the adult stage, determined by a piecewise-linear response model. The slope (yield decrease per unit salinity increase), salinity response threshold, maximum electrical conductivity without yield reduction (EC o ), and salinity level for which yield would be zero (EC o ) were determined by a nonlinear least-squares inversion method from curves based on the response of leaf and stem dry weights to substrate EC. The genotype PE-2  (L. pimpinellifolium)  had the highest salt tolerance, followed by PE-45  (L. pennellii),  PE-34, PE-43  (L. hirsutum),  and PE-16  (L. peruvianum).  The model also was tested replacing substrate salinity levels with leaf Cl -  or Na +  concentrations. Concentrations of both ions for which vegetative yields were zero (Cl o  and Na o ) were determined from the response curves. In general, the most tolerant genotypes were those with the highest Cl o  and Na o  values, suggesting that the dominant salt-tolerance mechanism is ion accumulation, but there were cases in which salt tolerance was not related to Cl o  and Na o .

Salinity Tolerance in Four Wild Tomato Species using Vegetative Yield-Salinity Response Curves