Physiological And Molecular Characterization Of Two Genetically Diverse Spring Wheat (Triticum Aestivum L) Cultivars For Salt Tolerance

摘要: Hydroponic experiments were conducted to appraise variation in the salt tolerance potential of two wheat cultivars (salt tolerant, S-24 and moderately sensitive MH-97) at different growth stages. Salinity stress caused a marked reduction plant biomass grain yield both cultivars. However, cv.S-24 was superior cv. MH-97 maintaining higher under saline stress.Furthermore, salinity significant physiological attributes measured stages.For example, net photosynthetic transpiration rate but varying extent stages.Higher rates recorded boot stage than other stages cultivars.The response gas exchange also variable stages.Salt cultivar more prone salt-induced adverse effects on as compared S-24. Salt considerable water relation plants.A leaf water, osmotic turgor potentials stages.Maximal reproductive cultivars.In contrast, maximal observed stage. Salt-induced prominent cv.MH-97 those The integrity PS II greatly perturbed this damage cv.MH-97.A alteration biochemical substantial decrease chlorophyll pigments, ascorbic acid, phenolics tocopherols.In it increased endogenous levels ROS (H2O2), MDA, total soluble proteins, proline, glycine betaine activities enzymatic antioxidants (SOD, POD, CAT, APX).These exhibited cultivars.For maximum accumulation proline early (vegetative boot).However, showed these organic osmolytes could be reason for maintenance that conditions.The various markedly cultivars, particularly vegetative consistent increase antioxidants, whereas, phenomena occurred erratically significantly toxic ions (Na+and Cl-) decreased essential cations (K+ Ca2+) stages.Furthermore, K+/Na+ Ca2+/Na+ ratios due MH-97.Moreover, It can inferred from results plants are