TRANSLOCATIONS INVOLVING TRITICUM CHROMOSOMES AND AGROPYRON CHROMOSOMES CARRYING RUST RESISTANCE

Abstract

Two programs have been carried out in which irradiation was used to translocate a gene for rust resistance from a Agropyron to a wheat chromosome. In one case, 1 out of 7 translocations and in another 1 out of 4 were transmitted normally through the gametes and proved to involve a wheat chromosome homoeologous to the Agropyron chromosome. It is suggested that the translocations are not randomly distributed among the wheat chromosomes and that this is because homoeologous chromosomes are not randomly distributed in the somatic nucleus.