خصوصیات ریشه، نسبت سدیم به پتاسیم و عملکرد دانه هفت ژنوتیپ گندم در شرایط تنش شوری

In order to investigate the effects of irrigation water salinity on root traits and absorption of sodium (Na+) and potassium (K+) by wheat cultivars, a factorial experiment, based on completely randomized design with 3 replications, was ‎conducted under greenhouse conditions. The main factor was 7 wheat genotypes ]Ghods, Marvdasht and Bahar (sensitive to salinity) and Arg, Bam, Sistani and Singh-2 (tolerant to salinity)] and the second factor was ‏three levels of irrigation water salinity [1.3 (control), 5 and 10 dS/m]. In this study, the effect of salinity stress on root growth traits including root dry weight, root/shoot ratio, root volume and length, Na+/K+ ratio and grain yield were assessed. Results showed that increasing the salinity of irrigation water increased Na+/K+ ratio significantly, other studied traits were decreased significantly, and 10 dS/m salinity treatment caused the most negative effects. Means of the measured traits showed superiority of Arg, Bam, Sistani and Singh-2 cultivars, as compared to three other cultivars. Also, in all the studied traits, the highest percentage of reduction in 10 dS/m salinity, compared to control, was for Marvdasht cultivar, which shows the sensitivity of this genotype. Therefore, considerable superiority of some root characteristics and Na+/K+ ratio in salinity tolerant cultivars of ‎wheat may be useful for screening the salinity tolerant wheat genotypes