Keywords: کیفیت گلوتن; Wheat; Gluten quality; Varietal differences; Environmental factorsANOVA, Analysis of Variance; Ext, Extensibility measured by the Kieffer Extensibility Rig; FN, Falling Number; GMP, Glutenin MacroPolymers; HMW-GS, High Molecular Weight Glutenin Subunits;