Comparison of the Protein Composition and Analysis of the Specific Protein from Wheat-Haynaldid villosa Chromosome Substitution Line and Translocation Line by 2D-PAGE STUDIES ON WHEAT-RYE CHROMOSOMES SUBSTITUTION Introgression of Resistance to Powdery Mildew Conferred by Chromosome 2R by Crossing Wheat Nullisomic 2D with Rye SOME PROBLEMS INVOLVED IN THE CROSS BETWEEN OCTOPLOID AND HEXAPLOID FORMS OF TRITICALE Characterization of low-nitrogen tolerance capacities of Chinese Spring-substitution lines of wheat under deficient-N condition at the seedling stage