Document Type : Original Article

Authors

1 Department of Agronmy and Plant Breeding, Tabriz Branch, Azad University, Tabriz, Iran

2 Department of Agronmy and Plant Breeding, Ardebil Branch, Azad University, Ardebil, Iran

Abstract

In order to determine the heritability and genetic parameters of yield and yield components under salinity stress in barley, a crossing 7×7 one-way diallel was conducted during 2016 – 2017 in Islamic Azad University, Ardabil, Iran. The F1 seeds alongwith their parents were grown in a greenhouse experiment under non-stress (control) and salinity stresses of 8 and 12 ds/m. In this research, yield and some morphological and agronomic traits were measured. The results of the goodness of fit indicate the adequacy of additive-dominant model for all of the traits. Results showed that all traits had high broad sense heritability, suggesting the usefulness of the traits under study in selection of salinity stress of barley. The results of the experiment showed that the average degree of dominance in all salinity levels was greater than one, so the above traits were controlled by the over-dominance. Results showed that for plant height, dominant alleles and for grain yield and 100 kernels weight, recessive alleles are favorable. Non-significant GCA source of variation in Grifting's method in most of the traits, confirmed the contribution of dominance effects. The narrow sense heritability of traits was low, suggesting that selection for these traits should be delayed until after some homozygosity was achieved. Based on the narrow sense heritability, it was concluded that, under moderate salinity (8ds/m) spike weight, number of seeds/spike and plant yield and under sever salinity (12ds/m) spike weight, number of fertile tillers and plant yield can be regarded as favorable criteria for selection of salinity tolerance in barley.

Keywords

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