Inheritance and linkage relationships of gliadin proteins and glume color in durum wheat

Abstract

Reciprocal backcross lines of two crosses were used to study the inheritance and linkage relationships of gliadin bands 42 and 45, as determined by polyacrylimide gel electrophoresis, and glume color in durum wheat (Triticum turgidum L.). Glume color was monogenically inherited, with partial dominance of buff color. Gliadin bands 42 and 45 were each controlled by one gene, located 7.87 ± 2.39 and 10.32 ± 2.44 crossover units, respectively, from the gene for glume color. Gliadin band 42 was always associated with bands 31 and 35. Gluten strength, as determined by sodium dodecyl sulphate sedimentation test, related closely to the genetics of gliadin bands 42 and 45, with the heterozygous band 42/45 types falling midway between the weak gluten homozygous band 42 and strong gluten homozygous band 45 types. Gluten strength data indicated that at least one additional gene, independent of those controlling these gliadins, is also involved.Key words: Triticum, gliadin, glume colour, linkage.