A Haplo-Viable Deficiency-Duplication from an Interchange in Triticum monococcum

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Abstract
Plants of einkorn heterozygous for a particular X- ray-induced interchange produced 93% normal- and 7% abnormal-appearing progeny. The abnormal plants were somewhat smaller, were slightly sterile, and had 7 pairs of chromosomes in some PMC and 5 pairs plus a chain of 4 chromosomes in others. It was concluded that these peculiar plants had received a deficiency-duplication gamete from segregation of chromosomes involved in the interchange. About 35% of the female gametes of plants with the deficiency-duplication transmitted the abnormality, but it was rarely transmitted through the pollen. The effect of the deficiency-duplication on the transmission of 14 genes was tested. 12 of the genes, from 5 linkage groups, segregated normally, but the transmission of 2 genes was markedly altered. These 2 genes were presumed to constitute a new linkage group. The usefulness of chromosomal aberrations wherewith the transmission of affected chromosomes (and genes) is altered is considered to be greater than that of trisomes in many nonpoly-ploid species. A method is suggested for associating the deficiency-duplication (or other aberration) with other chromosomes of the complement by means of interchanges. Expected and observed configurations in plants heterozygous for certain types of interchanges are contrasted.