The relationship between the HMW-GS and LMW-GS components and the size distribution of glutenin polymeric protein and dough properties were studied using Glu-1 normal and deletion lines, which provides a foundation for investigating the potential of Glu-1 deletion line in quality improvement of wheat. In the 20 hard white winter wheat lines tested, one was Glu-A1 deletion line, five were Glu-D1 deletion lines, and three were Glu-A1 and Glu-D1 double-deletion lines. Flour protein contents of the lines tested...