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Free PA (spermine, spermidine, and putrescine) content in tomato seedlings grown in hydroponics under control conditions or 5 d of salt (125 mm NaCl) stress. Data represent means and se of six replicates. Letters indicate values that significantly differ between SlZF2 transgenic tomatoes and wild-type (WT) lines according to the Student-Newman-Keuls test at P < 0.05.
