واکنشهای فیزیولوژیکی و بیوشیمیایی برخی از ارقام و پایههای انگور تحت تیمار سدیم نیتروپروساید در شرایط تنش شوری

In order to investigate the effect of sodium nitroprusside on reducing the negative effect of salinity stress on four grape rootstocks and cultivars, a research was carried out in a factorial based on a completely randomized block design with three replications. Two-year-old rooted cuttings of all four cultivars and rootstocks (Bidaneh Sefid, Yaghouti, 140Ru and 1103P), were subjected to three levels of salinity (salinity in Cramer's nutrient solution) zero, 25 and 50 mM sodium chloride (1.3, 4.50 and 6.80 ds/m) and three levels of sodium nitroprusside (SNP) zero, 0.5 and 1 mM. The results showed that increasing salinity levels, reduced the indices of leaf relative water content and contents of chlorophyll a and b and carotenoid. Furthermore, proline, glycine betaine, soluble sugars, total phenolic, ion leakage, malondialdehyde and hydrogen peroxide increased along with increasing salinity levels. Based on the results, application of SNP, especially at a concentration of 1 mM under salt stress conditions, increased the leaf relative water content, the content of photosynthetic pigments, total phenolic, proline, glycine betaine and soluble sugars, and reduced ion leakage, malondialdehyde and hydrogen peroxide in grape cultivars and rootstocks. Use of SNP caused greater effects on 'Bidaneh Sefid' and 'Yaghouti' cultivars than the rootstocks. The results showed that 'Bidaneh Sefid' cultivar was sensitive to salinity, while 140Ru rootstock was more tolerant to salinity than 'Bidaneh Sefid' and 'Yaghouti' cultivars, as well as 1103P rootstock. [ABSTRACT FROM AUTHOR]