Indian Journal of Genetics and Plant Breeding (The)

Linkage relationships between twenty-two character combinations were studied in the different crosses of barley in the F₂, F₃ and B₁ generations.

The factors controlling the expression of normal vs. virescent seedlings (Yc yc), hoods vs. awns (K k), black vs. white lemma and pericarp (B b), broad vs. narrow leaves (Brl brl) and heading date (Ea₃ ea₃) showed independent inheritance from the factors for non-six row vs. six row (V v) and long vs. short outer glume awns (E e). The factors Eh eh, Brl brl, Ea₃ ea₃ and Yc yc were inherited independently of Pr pr (purple vs. white leaf sheath). The factor K k also showed independent inheritance from B b factor.

It appears that the factors V, e and pr belong to linkage group I, the cross-over values among v-pr and e-pr, being 11.74±0.87 per cent and 39.88±2.69 per cent respectively.

The cross-over values between the genes eh-brl, eh-ea₃ were 35.12±4.32 per cent, and 38.0±12.53 per cent, respectively, while ea₃ and brl appeared to show independent inheritance. The order of these genes, therefore, appears to be ea₃-eh-brl; none of these genes showed any linkage with marker genes in linkage group I. The possibility of these genes belonging to linkage group V is discussed.