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Chromosomal Location of Genes for Resistance to Greenbug in ‘Largo’ and ‘Amigo’ Wheats 1

1983; Wiley; Volume: 23; Issue: 1 Linguagem: Inglês

10.2135/cropsci1983.0011183x002300010026x

1435-0653

Margaret M. Hollenhorst, L. R. Joppa,

Mycotoxins in Agriculture and Food

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 ✕ 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 F 2 plants from monosomic F 1 s 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.