Identify QTLs associated with storage and remobilization of assimilates and grain yield of barley in two irrigation regimes

In order to identify QTL associated with storage and remobilization of assimilates to grain, 72 barley double haploid lines along with Steptoe and Morex parents were evaluated in a simple lattice design with two replications under irrigated and water deficit conditions. Resulted based on composite interval mapping method revealed that under normal conditions, 17 QTL were significant for traits related to storage and remobilization of assimilates. The variance of phenotypes explained by this QTL varied from 11 to 20 percent. The highest and lowest phenotypic variances belonged to grain yield and allocation of photosynthetic to the stem, respectively and LOD ranged from 3.02 to 6.11. In water deficit condition, 14 QTL were detected. The phenotypic variance explained by this QTL varied from 11.86 to 19.77 percent, which belonged to remobilization of photosynthetic and allocation of photosynthetic to stems respectively.  The LOD ranged from 3.12 to 5.61. In this study, allocation of photosynthetic to the stem two stable QTL detected on chromosomes 3H and 1H, for spike partitioning, a stable QTL on chromosome 4H, for remobilization of photosynthetic, two stable QTLs on chromosomes 4H and 1H and for the grain yield, two stable QTL on chromosomes 4H and 3H were identified. Recommended that after validation of the identified stable and clustered QTLs for significant quantitative and qualitative traits related to the storage and remobilization of photosynthetic materials and barley grain yield, these QTLs can be used in the marker selection program.