In order to study the effects of different levels of salt stress and nitrogen (N) on physiological mechanisms, carbon isotope discrimination (Δ¹³C), and yield of two wheat cultivars (cv.), a two-year field experiment was carried out during 2013–2015. The treatments included three levels of salt stress (1.3, 5.2, and 10.5 dS m⁻¹), three levels of N (50, 100, and 150 kg N ha⁻¹), and two wheat cultivars, Bam and Toos. Under salt stress, N application (100 and 150 kg N ha⁻¹) produced a significant effect on both cultivars with respect to physiological traits, i.e., net photosynthetic rate (P_n), stomatal conductance (g_s), chlorophyll index (CI), Na+/K+ ratio as well as the grain yield (GY). The salt-tolerant and -sensitive cultivars exhibited the maximum values of physio-biochemical and yield attributes at 100 and 150 kg N ha⁻¹, respectively. The results of Δ¹³C showed a significant difference (P<0.001) between wheat cultivars under the control and salt stress. According to our result, salt-tolerant cultivar Bam seems to be more efficient in terms of higher GY, P_n, g_s, CI, and lower Na+/K+ ratio as well as higher Δ¹³C as compared with salt-sensitive cultivar Toos, under salt stress. Therefore, a significant positive correlation that observed between Δ¹³C and GY, indicated that Δ¹³C may be an effective index for indirect selection of yield potential in wheat under irrigation regimes with saline water.

为了研究不同水平盐胁迫和生理机制氮（N），碳同位素分辨率（Δ的效应¹³ C），和小麦品种（产量CV），两年场进行实验在2013–2015年期间。处理包括三个水平的盐胁迫（1.3、5.2和10.5 dS m ^-1），三个水平的氮（50、100和150 kg N ha ^-1）和两个小麦品种Bam和Toos。在盐胁迫下，施氮（100和150 kg N ha ^-1）对两个品种的生理特性（即净光合速率（P _n），气孔导度（g _s））均产生显着影响_。），叶绿素指数（CI），Na + / K +比以及谷物产量（GY）。耐盐和敏感品种分别在100和150 kg N ha ^-1时表现出最大的生理生化和产量属性。Δ的结果¹³ Ç呈显著差异（P控制和盐胁迫条件下小麦品种之间<0.001）。根据我们的结果，耐盐品种的Bam似乎是在较高的方面GY，更高效的P _Ñ，克_小号，CI，并降低的Na + / K +比率以及更高的Δ ¹³与盐敏感品种特什相比Ç ，在盐胁迫下。因此，Δ之间观察到显著正相关¹³C和GY，表示Δ ¹³ C可以用于小麦产量潜力的间接选择下灌溉制度与盐水的有效指标。