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| Effects of salt and nitrogen on physiological indices and carbon isotope discrimination of wheat cultivars in the northeast of Iran |
| Azam BORZOUEI, Mir Ahmad MOUSAVI SHALMANI, Ali ESKANDARI |
Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute (NSTRI), Karaj P.O. Box 31485498, Iran |
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Abstract In order to study the effects of different levels of salt stress and nitrogen (N) on physiological mechanisms, carbon isotope discrimination (?13C), 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 (Pn), stomatal conductance (gs), 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 ?13C 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, Pn, gs, 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.
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Received: 15 December 2018
Accepted:
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| Fund: This work was funded by the International Atomic Energy Agency of Iran through a research project (Production of salt-tolerant mutant lines using morpho-physiological mechanisms and stable 15N and 13C isotope (A87A057)) of plant breeding group, Agriculture Researh School, Nuclear Science and Technology Research Institute (NSTRI) of Iran, Karaj. |
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Corresponding Authors:
Correspondence Azam Borzouei, E-mail: aborzouei@aeoi.org.ir
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Cite this article:
Azam BORZOUEI, Mir Ahmad MOUSAVI SHALMANI, Ali ESKANDARI .
2020.
Effects of salt and nitrogen on physiological indices and carbon isotope discrimination of wheat cultivars in the northeast of Iran. Journal of Integrative Agriculture, 19(3): 656-667.
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