Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 23:91-93 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chromosomal Location of Genes for Resistance to Greenbug in ‘Largo’ and ‘Amigo’ Wheats1

Margaret M. Hollenhorst and Leonard R. Joppa2

The greenbug (Schizaphis graminum Rondani) causes significant economic losses to wheat, oats, barley, and sorghum. Genetic resistance to the greenbug recently has been identified in the germplasm lines ‘Amigo’ (Triticum aestivum L.) and ‘Largo’ (Triticum turgidum x T. tauschii) hexaploid wheats. Amigo has a single dominant gene transferred from rye (Secale cereale L.), and Largo is an amphiploid of ‘Langdon’ durum (T. turgidum L.) and T. tauschii (Coss.) Schmal. Crosses between Largo and Amigo indicated that each parent has a single independent gene for resistance to greenbug biotype C. A set of ‘Chinese Spring’ monosomics were used to determine the chromosomal location of the resistance genes in Amigo and Largo. The F2 plants from monosomic F1s were grown to the two to three leaf stage in 12-cm-pots or in flats and infested with greenbug biotype C. We found that the gene in Amigo is located in chromosome 1A and the gene in Largo is located on chromosome 7D. Chromosome pairing data from crosses between the Chinese Spring monosomics and Amigo indicated that Amigo differs from Chinese Spring by two reciprocal translocations which involve chromosomes 6A, 6B, 7A, and 7B.

Key Words: Triticum tauschii • Secale cereale • Schizaphis graminum • Triticum aestivum • Inheritance • Translocations • Aneuploids • Monosomics

1 Contribution No. 1166. USDA-ARS and North Dakota Agric. Exp. Stn., North Dakota State Univ., Fargo, ND 58105. Part of a thesis submitted to the Agronomy Dep., North Dakota State Univ. in partial fulfillment of requirements for M.S. degree.

2 Research technologist, Agronomy Dep., NDSU, Fargo, ND 58105 and research geneticist, USDA-ARS, Agronomy Dep., NDSU, Fargo, ND 58105.

Received for publication March 5, 1982.




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Copyright © 1983 by the Crop Science Society of America.