Mapping of drought tolerance indices genomic locations in double haploid lines of Barley

In order to map the genomic regions affecting barley drought tolerance indices, an experiment was conducted at the Agricultural and Natural Resource Station of Sistan. Seventy tow double haploid lines of barley with their parents (Steptoe and Morex) were examined using two 9×9 simple Lattice (stress and non-stress), with two replications. Each plot consisted of six rows that were 3m in length and spaced 25cm apart. Based on the relative yield of genotypes in drought stress and non-stress conditions, drought tolerance indices Ys، Yp، TOL، MP، GMP، HM، DSI and STI were calculated. Positive transgressive segregation was observed for YP، YS، GMP، MP and TOL. Seventeen QTLs controlling different indices were identified that fifteen of them appear to be quite stable in different indices. Highest LOD score were obtained for HM on chromosome 2H. QTLs for drought tolerance indices were found on chromosomes 2H, 3H and 5H. QTLs overlapping show the relationship between indices. Therefore, gain through marker-assisted selection (MAS) in this population would be efficient.