Abstract
The aim of this study was to investigate the effects of NaCl on expression of five genes—related to salinity tolerance—in grape (Vitis L.). Based on our screening study on 18 grape genotypes, ‘H6’ and ‘Gharashani’ (tolerant) and ‘Shirazi’ and ‘GhezelUzum’ (sensitive) were selected for molecular analysis. Plants were treated with 50 mM NaCl as a critical concentration that is not lethal for grapevine plants. Growth parameters reduced under salinity, that decrease in sensitive genotypes was higher than tolerant ones. The expression of VvRIP1 (abscisic acid receptor) increased in leaves of sensitive and decreased in tolerant genotypes. Also the expression of VvGID1L1 (a gibberellin receptor) was similar to VvIAA5 (an auxin-induced protein) under salinity, both of them upregulated in roots of tolerant and down regulated in sensitive genotypes. Our findings showed a significant difference between tolerant and sensitive genotypes.
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