GENETICS OF GLIADIN OF SPRING DURUM-WHEAT (TRITICUM-DURUM DESF)

Electrophoretic analysis of gliadin composition (electrophoresis in ac id aluminum-lactate buffer, pH 3.1) of spring durum wheat variety Lang don (Triticum durum Deaf.) and its disomic substitution lines has reve aled that the genes controlling 19 out of 23 components of Langdon are located on the chromosomes of the first and sixth homoeologous groups . Gliadin electrophoretic analysis of 75 F-2 grains, obtained from the cross Langdon x Leukurum 1805 has shown that all gliadin genes locate d on one chromosome are tightly linked and constitute a single gliadin -coding locus, since gliadin components controlled by these genes are inherited as a single Mendelian character. Gliadin of spring hard whea t is inherited codominantly in accordance with the gene dose in the tr iploid endosperm. By analogy with common wheat, we designated groups o f gliadin components of durum wheat inherited together as blocks of gl iadin components. An analysis of 16 intervarietal crosses, including 2 6 varieties, permitted to distinguish 8 allelic variants of blocks con trolled by chromosome 1A, 4 - 1B, 17 - 6A and 9 - by chromosome 6B. A system for designation of allelic variants of blocks for durum wheat h as been advanced. A catalog of gliadin blocks has been compiled, which can be used in durum wheat genetics and breeding programs.