تأثیر سطوح مختلف شوری و کود نیتروژن بر برخی ویژگی‌های فیزیولوژیک و بیوشیمیایی ارقام گندم در مرحله پنجه‌زنی

In order to assess the physiologic responses of two wheat genotypes to different levels of salinity and nitrogen (N) at tillering stage, a factorial experiment, based on completely randomized design with three replications, was performed under greenhouse conditions. Treatments were two wheat cultivars [Tajan (susceptible to salt stress) and Bam (resistant to salt stress)], five levels of salt stress ‎‎[control (1.3), 6, 8, 10 and 12 dS/m)] and two levels of N (75 and 150 kg N/ha). Results indicated that in all salinity treatments, application of 150 kg N/ha increased chlorophyll b content, total soluble proteins, SOD activity, and decreased MDA content of both ‎genotypes. Salinity decreased relative water content (RWC) of both genotypes. However, N fertilizer did not have significant effect on the mentioned parameter. In this respect, genotypic differences for salinity tolerance and fertilizer uptake caused higher levels of the N fertilizer to be more effective on Bam genotype than Tajan genotype. These results suggest that N fertilizer, as a primary nutrient for ‎physiological compounds, may alleviate the adverse effects of salinity stress on wheat at sensitive stage of tillering