A field experiment, in a split-split plot design with three replications, was conducted, during 2009/2010 growing season in semi arid region Mogran belongs Zaghouan governorate, to evaluate the response of eleven bread wheat (Triticum aestivum L.) genotypes under four water stress treatments (T0: rainfall, T1: rainfall + 10 mm, T2: rainfall + 20 mm, T3: rainfall + 30 mm applied at each stage). The evaluation was based on eight agro-morphological traits: flag leaf area (FLA), plant height (PH), spike length (SL), spikelet number/spike (SN/S), 1000 kernel weight (TKW), grain yield/spike (GY/S), root length (RL) and root volume (RV). Variance analysis revealed a high significant (p<0.01) effect of water treatments and genotypes for all traits except spikelet number/spike. Water supply had a positive effect on yield and yield related traits. In fact, greatest values were obtained under T3 for PH, SL, SN/S, TKW and GY/S. Accession 10 gave the highest spikelet number/ spike, 1000 kernel weight and grain yield/spike which appeared to be the most drought tolerant genotype. Grain yield/spike was significantly and positively correlated with PH (r = 0.25), SL (r = 0.32), SN/S (r = 0.75), and TKW (r = 0.88) which indicated that effective selection can be done on these traits through breeding programs.
Screening of tolerant and susceptible bread wheat (Triticum Aestivum L.) accessions to water stress under field conditions in mogran, zaghouan environment
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