Genetic Structure of some Agronomic Traits of Barley under Normal and Salinity Conditions

Salinity is one of the main osmotic stresses limiting plants growth and development through changes in osmatic and ionic balance. In order to mapping of the genomic regions of controlling quantitative trait locus (QTLs), related to salinity tolerance in barley and assessment of associated indices, an experiment was conducted during 2016-2017 using 100 families of barley along with their parents (badia × comino) in randomized completely design with three replications. The application of stress in four leaf stages of barley was applied as salting with a 10-day interval. Irrigation with 5 dS of water was started and in next steps, the salinity of irrigation water increased at 10, 15 and 20 dS / m2. In total 12 QTLs detected in the situation of normal and 8 QTL in the stress. condition. Total phenotypic variance explained by the QTLs varied from 9 to 14.3 percent, which the lowest related to stem length, chlrophyll content under normal conditions and the highest related to total number of leaves under stress conditions. The highest LOD was the total leaf weight trait obtained under stress condition (3.354). Stable QTLs in three environments as well as linked markers could be used in the marker assisted selection (MAS) to improve characteristics under salinity conditions at different trials replicated over years.