Inheritance of greenbug resistance in several forms of grain sorghum and sudangrass

Abstract

The inheritance of resistance against the Krasnodar population of common greenbug Schizaphis graminum Rond. was analyzed in nine accessions of grain sorghum and sudangrass. The dominant gene of cultivar Capbam (k-455, United States) was effective against some greenbug clones and differed from the Sgr1–Sgr11 resistance genes. The gene was designated as Sgr12. The cultivar Capbam was proposed for use as a differentiator in population genetic studies in S. graminum. The cultivar Sarvasi (k-3852, Hungary) contains not only the dominant Sgr1 gene, but also a recessive gene (most likely Sgr2), which is effective against some greenbug clones. Grain sorghum accessions k-928 and k-929 (Gugara Belaya, western China) each carry two highly effective dominant resistance genes, which differ from Sgr1–Sgr4, Sgr6, Sgr9, and Sgr10. In addition, the resistance genes of accession k-929 differ from the Sgr5 gene. Accession k-928 proved to contain an additional dominant resistance gene, which is expressed in response to some greenbug clones. The gene was designated as Sgr13. Sudangrass accessions k-100 and k-122 (Ukraine) each carry two dominant resistance genes. Accessions k-62, k-99 (Ukraine), and k-96 (Russia) each carry one dominant and one recessive resistance gene. The dominant resistance genes that are expressed in the cultivar Odesskaya 25 (k-122) in response to infestation with some clones from the natural greenbug population were designated as Sgr14 and Sgr15.