Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 52 3 2021 09 23 Response evaluation to salinity stress in some bread wheat genotypes using tolerance indices Response evaluation to salinity stress in some bread wheat genotypes using tolerance indices 97 111 84302 10.22059/ijfcs.2020.296254.654685 FA Kobra Mokarian College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. Reza Maali Amiri College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. 0000-0003-2496-4800 َAli Peighambari College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. Mohammad Tagi Tabatabaee Agricultural and Natural Resources Research and Education Center, (AREEO), Yazd, Iran Fatemeh Daneshmand Biology Department, Payam Noor University, Tehran, Iran. Journal Article 2020 01 21 To assess salt tolerance of 20 wheat genotypes, a randomized complete block design (RCBD) experiment with four replications under salinity (10 ds/m) and non-stressed conditions in a field experiment was conducted. Analysis of variance showed the significant differences among genotypes for tolerance indices and grain yield under salinity and non-stressed conditions. The result of correlation between stress tolerance indices and yield means showed that Mean Productivity (MP), Geometric Mean Productivity (GMP), Stress Tolerance Index (STI) and Harmonic Mean (HM) were the most suitable indices for selection of productive genotypes. HM was selected as the best indices for salt tolerance due to its higher correlation with grain yield under salinity stress conditions. The result of factor analysis based on these indices explained 99.87% of data changes. Genotypes were categorized into four clusters by cluster analysis. Totally, based on Bi plot, cluster analyses and tolerant indices, 7 and 8 genotypes having the highest yield (4725 and 4716 kg/ha, respectively), were determined as tolerant genotypes under salinity stress conditions. To assess salt tolerance of 20 wheat genotypes, a randomized complete block design (RCBD) experiment with four replications under salinity (10 ds/m) and non-stressed conditions in a field experiment was conducted. Analysis of variance showed the significant differences among genotypes for tolerance indices and grain yield under salinity and non-stressed conditions. The result of correlation between stress tolerance indices and yield means showed that Mean Productivity (MP), Geometric Mean Productivity (GMP), Stress Tolerance Index (STI) and Harmonic Mean (HM) were the most suitable indices for selection of productive genotypes. HM was selected as the best indices for salt tolerance due to its higher correlation with grain yield under salinity stress conditions. The result of factor analysis based on these indices explained 99.87% of data changes. Genotypes were categorized into four clusters by cluster analysis. Totally, based on Bi plot, cluster analyses and tolerant indices, 7 and 8 genotypes having the highest yield (4725 and 4716 kg/ha, respectively), were determined as tolerant genotypes under salinity stress conditions. https://ijfcs.ut.ac.ir/article_84302_c4b81bd050188ff9ed550d0929efa9f4.pdf