Abstract
The leaf-rust resistance of Agrus, a wheat-like Agropyron elongatum derivative, was found to be due to a gene (or genes) on an Agropyron chromosome. X-rays and thermal neutrons were used to translocate a segment of this chromosome to a wheat chromosome. Four translocations involving the gene for leaf-rust resistance were obtained. One, located on chromosome 7D (XXI), appears to have no detrimental effect on plants and is transmitted normally through the gametes.