Resistance to soybean mosaic virus conferred by two independent dominant genes in PI 486355

• Published in: The Journal of heredity 1993-01, Vol.84 (1), p.25-28
• Main Authors: Chen, P. (Virginia Polytechnic Institute and State University, Blacksburg, VA), Buss, G.R, Tolin, S.A
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Classical genetics, quantitative genetics, hybrids; Fundamental and applied biological sciences. Psychology; GENE; GENES; GENETICA; Genetics; Genetics of eukaryotes. Biological and molecular evolution; GENETIQUE; GLYCINE MAX; HEREDITE; HERENCIA GENETICA; HIBRIDACION; HYBRIDATION; LOCI; LOCUS; Pteridophyta, spermatophyta; RESISTANCE AUX MALADIES; RESISTENCIA A LA ENFERMEDAD; Soybean mosaic virus; Soybeans; Vegetals; VIRUS DEL MOSAICO DE LA SOJA; VIRUS MOSAIQUE SOJA; Viruses
• ISSN: 0022-1503; 1465-7333; 1471-8505
• DOI: 10.1093/oxfordjournals.jhered.a111272

Genetic studies were conducted to determine the number of gene loci conditioning resistance to soybean mosaic virus (SMV) in PI 486355 (Glycine max (L.) Merr.) and to establish the allelomorphic relationships of its resistance genes and the Rsv1 locus. F2 populations and F2-derived F3 (F2:3) lines from resistant (R) X susceptible (S) and R X R crosses were inoculated with SMV in the greenhouse or in the field. Strains SMV-G1, G6, or G7 were used, as appropriate, to observe genetic segregations. The F2 plants from crosses of the S cultivars, Lee 68 and Essex, with PI 486355 segregated in a 15R:1S ratio following inoculation with any of the three strains. The F2:3 data from the same crosses exhibited a ratio of seven homogeneous R: four segregating 3R:1S:four segregating 15R:1S:one homogeneous S. The results indicate that PI 486355 carries two independent dominant genes that confer resistance to SMV. The F2 populations and F2:3, lines derived from R X R crosses of PI 486355 with York, Ogden, Marshall, and Kwanggyo (each possessing a dominant allele at the Rsv1 locus) did not segregate for susceptibility, suggesting that one of the two resistance genes in PI 486355 is at the Rsv1 locus. The presence of necrotic (N) plants in Pi 486355 X S F2 populations suggested that one of the PI 486355 genes exhibits incomplete dominance similar to that observed with some Rsv1 alleles. Experiments are in progress to further characterize the resistance genes in PI 486355