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D-Genome Substitution-Monosomics of Durum Wheat¹

Each of the D-genome chromosomes was substituted for its homoeologous A- and B-genome chromosomes in Triticum turgidum L. cv. durum ‘Langdon’. All 14 possible substitution-monosomics were obtained by crossing the appropriate ‘Chinese Spring’ nullisomic-tetrasomic (Triticum aesthium L.) with Langdon. Selfing these F,'s and selecting for 14 chromosome pairs in the F₂ and F₃ resulted in the disomic substitution of a D-genome chromosome pair for a homoeologous A- or B-geuome chromosome pair. When these disomic substitutions were backcrossed to Langdon, the BC, progenies were substitution-monosomics with 13 pairs plus two univalents (13" + 2'). One of the univalents was an A- or B-genome chromosome and the other univalent, the homoeologous D-genome chromosome. In repeated backcrosses to Langdon durum, the D-genome chromosomes were transmitted through the female gametes 33% of the time on the average. The substitution-monosomics were more fertile, more vigorous, and the D-genome chromosomes were transmitted through the female gamete at a higher rate than the durum monosomics. They can be used for many of the same genetic studies as the monosomics in hexaploid wheat.

Key Words: Triticum turgidum • Aneuploids • Telesomics • Trisomics • Isomics • Translocations • triploids

² "Research geneticists, ARS, USDA, North Dakota State Univ., Fargo, ND 58102.

Received for publication March 9, 1977.

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