Recent studies have shown that Golden Promise is also salt-tolerant whereas the parent cultivar Maythorpe is salt-sensitive. The only known genetic difference between the two lines is the ari-eGP mutation, which results in the semi-dwarf phenotype of Golden Promise. The expressed gene(s) induced by salinity were investigated using the mRNA differential display technique. Several genes related to salt tolerance were identified. Among them, one encoding a regulatory Leucine Zipper transcription factor was expressed in the absence of salt in Golden Promise but not in Maythorpe. This gene was over expressed in Maythorpe under high salinity but not in Golden Promise. In addition, a chloroplast gene petB, a vacuolar ATPase, a BARE-1 copia-like retro-element and RuBisCo subunits were induced by salt in the saltsensitive cultivar ‘Maythorpe’ (Forster, 2001; Wei et al., 2001).