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Inheritance of Resistance to Greenbug Toxicity in an Amphiploid of Triticum turgidum/T, tauschii¹

Each year the greenbug (Schizaphis graminum Rondani) causes losses in wheat production having an estimated value of several million dollars. A new source of resistance to greenbug toxin has been found in PI 268210 (Triticum tauschii (Coss.) Schmal 2n=14). The cultivar ‘Langdon’ (T. turgidum L. durum group 2n=28) was used as female in a cross with PI 268210, and an amphiploid with 2n=42 chromosomes was obtained. The amphiploid was crossed with two hexaploid wheat lines, Kt-C and ‘Little Club’*9/WRT2~8 (T. aestivum L. aestivum group 2n=42). F₂ segregations indicated that resistance to greenbug toxin in the amphiploid was conditioned by a single dominant gene. Chromosome pairing between the D-genome chromosomes of the amphiploid and the D-genome chromosomes of the T. aestivum lines appeared to be normal and chromosomal interchanges were not detected.

Key Words: Aegilops squarrosa • Greenbug toxin • Insect preference • Wheat

² Research geneticists, AR-SEA-USDA, c/o Agronomy Dep., North Dakota State Univ., Fargo, ND 58105.

³ Research plant pathologist, AR-SEA-USDA, c/o Plant Pathology Dep., North Dakota State Unix., Fargo, ND 58105.

Received for publication August 27, 1979.