qtls mapping controlling phonological traits of barley under normal and drought stress conditions

in order to map qtls controlling phonological traits of barley under normal and drought stress conditions, an experiment was conducted by 72 doubled-haploid lines and their two parents (steptoe and morex), at the research farm, college of agriculture, university of zabol, in 2011. the experiment was arranged in completely randomized block designs with three replications under normal irrigation and drought stress conditions. phonological traits such as days to emergence, days to tillering, days to stem emergence, days to heading, days to flowering, days to milking, days to doughying, days to maturity and grain filing period were measured. qtl analysis was carried out with composite interval mapping (cim) method by qtl cartographer software ver 2.5. barley molecular marker linkage map comprised of 327 rflp markers with 1226.3 cm length and 3.75 cm mean distance. the effect of genotype was significant (p<0.01) for all studied traits. a totall of forty two qtls were detected for different studied traits. phenotypic variances explained by these qtls varied from 6.34% for days to flowering to 41.18% for days to milking. the highest lod score was for days to doughying that was located on 2h chromosome. mapped qtls don’t have necessary stability. therefore, gain through marker-assisted selection (mas) in this population for these traits likely would be limited. because, the environment plays a tremendous role in the phenotypic expression of phonological traits.