Abstract
Tomato (Solanum lycopersicum L.) is moderately salt sensitive and yield can be reduced by 50% when exposed to a 7.5 dS·m−1 electrical conductivity (EC) saline solution. The response of tomato, cv. K-21, to presowing seed treatment with sodium chloride (NaCl) and sodium nitroprusside (SNP) was investigated. Before sowing, surface-sterilized seed of tomato were soaked in 50, 100, or 150 mM NaCl for 8 h and then transferred to a 10−5 M solution of SNP for 8 h. Plants were sampled at 45 and 60 days after sowing (DAS) to assess carbonic anhydrase activity (E.C. 4.2.1.1), relative water content, photosynthetic attributes, and growth parameters. Activity of carbonic anhydrase and all other parameters was increased by SNP application following the NaCl treatment. Detrimental effects generated by the 50 mM NaCl concentration were completely neutralized by SNP at 60 DAS, whereas those of highest NaCl concentration were not reversed by SNP at both sampling stages. It appears that SNP alleviates salinity stress up to 50 mM NaCl.
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