Identification of some Quantitative Traits Loci for Growth Stage Drought Tolerance in a Bread Wheat Doubled Haploid Population

The aim of this study was to determine the drought tolerance control loci in growth stage in bread wheat. In this regards 99 doubled haploid lines with their parents were evaluated in a randomized complete block design with three replications in two drought stress levels. Genotypes mean square for all traits in two environments was significant. Thirty three SSR markers and 24 TRAP markers which was polymorphism in the parents were tested on doubled haploid lines. QTL analysis was performed with single marker analysis. In non stress conditions five QTLs on chromosomes 1B, 1A, 3A, 5A and 7A and in stress conditions two QTLs on chromosomes 2D and 7A were identified for plant height, which overall were explained 36.35 and 13.49 percent of this trait variation in the non stress and stress environments respectively. For plant fresh weight six QTLs were identified in non stress conditions on chromosomes 1A, 1B, 2A, 5D, 1D and 5B and in stress conditions five QTLs on chromosomes 1A, 4A, 2B, 5A and 7A. These QTLs were explained 36.79 and 28.06 percent of this trait variation in non stress and stress environments respectively. For plant dry weight five QTLs were identified in non stress conditions on chromosomes 1B, 5D, 4A, 5A and 7A and two QTLs in stress conditions on chromosomes 1A and 7A. These QTLs were explained 28.57 and 13.65 percent of this trait variation in non stress and stress environments respectively. For water relative content for QTLs were identified in non stress conditions on chromosomes 1A, 4A, 5A and 6B and three QTLs in stress condition on chromosomes 7A, 5A and 4A. These QTLs were explained 26.23 and 25.87 percent of this trait variation in non stress and stress environments respectively.