RECOMBINATION MAPPING OF SOME CHROMOSOME 1A-CONTROLLED, 1B-CONTROLLED, 1D-CONTROLLED AND 6B-CONTROLLED GLIADINS AND LOW-MOLECULAR-WEIGHT GLUTENIN SUBUNITS IN COMMON WHEAT

Inheritance of low-molecular-weight glutenin subunits (LMW GS) and gli adins was studied in the segregating progeny from several crosses betw een common wheat genotypes. The occurrence of a few recombinants in th e F-2 grains of the cross Skorospelka Uluchshennaya x Kharkovskaya 6 c ould be accounted for by assuming that the short arm of chromosome 1D contains two tightly linked loci each coding for at least one gliadin plus one C-type LMW GS. These loci were found to recombine at a freque ncy of about 2%, and to be linked to the Glu-D3 locus coding for B-typ e LMW GS. Some proteins showing biochemical characteristics of D-type or C-type LMW GS were found to be encoded by the Gli-B1 and Gli-B2 loc i, respectively. Strongly stained B-type LMW GS in cvs Skorospelka Ulu chshennaya and Richelle were assigned to the Glu-B3 locus, but recombi nation between this locus and Gli-B1 was not found. Analogously, in th e cross Bozostaya 1 x Anda, no recombination was found between Gli-A1 and Glu-A3, suggesting the maximum genetic distance between these loci to be 0.97% (P = 0.05). A B-type LMW GS in cv Kharkovskaya 6 was assi gned to the Glu-B2 locus, with about 25% recombination from the GIB-B1 locus, The present results suggested that alleles at Gli loci may rel ate to dough quality and serve as genetic markers of certain LMW GS af fecting breadmaking quality.