Evaluation of two grape cultivars (Vitis vinifera L.) against salinity stress and surveying the effect of Methyl Jasmonate and Epibrassinolide on alleviation the salinity stress

Abstract

Salinity is a phenomenon challenging the plantation and growth of grape in arid and semiarid regions. During the present research, tolerance of two grape cultivars(Flame Seedless and Perlette) was evaluated against various sodium chloride salinity levels (0, 25, 50, 75 and 100 mM) and the effect of Epibrassinolide(EBR)(0, 3 and 6 µM) and Methyle Jasmonate(MeJA)(0, 3 and 6 mM) surveyed at these conditions which was conducted based on factorial experiment in the form of Complete Randomized Desighn(CRD) with four Replications. Based on the obtained results, the cultivar, salinity levels and hormonal treatments were significantly effective on surveyed traits. The results from analysis of variance revealed that increased salinity levels led to significant increase in values of lipid peroxidation, electrolyte leackage(EL), proline content and significant decrease in values of photosynthesis and transpiration rate, relative water content(RWC) and the content of chlorophyll a and b in two varieties. Furthermore EBR and MeJA treatments(specially 6mM MeJA) significantly increased proline content, content of chlorophyll a and b, photosynthesis and transpiration rate and decreased EL and lipid peroxidation in two varieties(except at high salinity stress) and mitigated the adverse effects of NaCl in two cultivars. Withoute salinity application Perlette cultivar produced the best values for physiological and morphological indices. In general, Perlette cultivar proved more tolerance against salinity than Flame Seedless cultivar did.