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Trisomic Analysis of Greenbug Resistance in Barley, Hordeum vulgare L.¹

The linkage group of the gene for greenbug (Schizaphis graminum Rondani) resistance in the barley (Hordeum vulgare L.) cultivar ‘Will’ was determined by using primary trisomics and tertiary trisomic homozygous translocations. The gene for greenbug resistance was found to be on linkage group 1 and on the centromere-bearing segment of chromosome 1 in the Tl-6a translocation. Previous attempts to locate the gene using standard marker genes were unsuccessful.

Key Words: Linkage • Trisomics • Tertiary trisomic homozygous translocations

² Assistant Professor, Texas A&M University Research and Extension Center at Dallas; Assistant Professor, Texas Agricultural Experiment Station, College Station, Texas; Associate Professor, Department of Biological Sciences, North Texas State University, Denton, Texas, respectively

Received for publication May 5, 1973.

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