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/WRT238 (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.
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Joppa et al. (1980) studied this question.