Physiological response of flax cultivars to the effect of salinity and salicylic acid

摘要

In this study, the effect of foliar-applied salicylic acid (SA) on counteracting the adverse effect of salinity stress (3000 and 6000 mg/l) on two flax cultivars (Sakha 2 and Amon) were carried out. Salinity with different concentrations induced deleterious effects as it significantly was reduced chlorophyll a, chlorophyll b, total chlorophylls, carotenoids and total pigments, polysaccharides and total carbohydrates content of the shoot of the two tested cultivars Sakha 2 and Amon except, carotenoid content of cultivar Amon it significantly increased. Meanwhile increased TSS, proline and free amino acids of the two cultivars. Salinity at both concentrations (3000 and 6000 mg/l) increased the absorption of Na and Cl and decreased the absorption of other elements (K, Ca, Mg, P and N) of the two cultivars. Yield and yield components (number of fruiting branches/plant, capsules number/plant, capsules weight /plant, seeds number/capsule, seeds weight /plant and 1000 seeds weight and oil % of the yielded seeds) were also reduced significantly. Exogenous application (foliar spray) of SA with different concentrations (200 &400 mg/l), counteracted salinity deleterious effects on flax two cultivars. SA enhanced flax salt tolerance in terms of improving most of yield measured parameters. Fatty acid profile of oil of the yielded seeds of the two cultivars, were varied in response to different salinity levels and different concentrations of SA used. Salicylic acid with 400 mg/l concentration was more effective than 200mg/l in counteracting the effects of salinity stress at both levels.