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This article in CS

  1. Vol. 29 No. 6, p. 1439-1441
     
    Received: July 18, 1988


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doi:10.2135/cropsci1989.0011183X002900060022x

Inheritance of Reaction to Soybean Mosaic Virus in Two Soybean Cultivars

  1. G. R. Buss ,
  2. C. W. Roane,
  3. S. A. Tolin and
  4. P. Chen
  1. C rop and Soil Environmental Sciences Dep.
    P lant Res. Ctr., Agric. Canada, Ottawa, Ontario, Canada K1A 0C6

Abstract

Abstract

Knowledge of the inheritance of resistance to major diseases is important to plant breeders. Segregation for reaction to soybean mosaic virus (SMV) was studied in two soybean [Glycine max L. (Merr.)] cultivars, Marshall and Kwanggyo, which exhibit differential reactions to strains of SMV. The objective was to determine the inheritance of resistance in each cultivar and the genetic relationship of the resistance genes. The F2-derived F3 lines from the crosses Kwanggyo ✕ ‘Lee 68’, ‘Essex’ ✕ Marshall, Marshall ✕ Lee 68, and Kwanggyo ✕ Marshall were sown in single 0.9 m rows and resulting seedlings were inoculated with SMV. Rows were classified as all resistant, all susceptible, or segregating according to counts of susceptible and resistant plants. Necrotic plants were observed and were included with the resistant class since they were strongly associated with rows that were segregating for SMV reaction. The data indicated that both Marshall and Kwanggyo have single dominant genes for resistance and that the genes are probably alleles at a single locus. No evidence for linkage was found between the resistance gene in Kwanggyo and the T-t gene pair, which controls pubescence color. Also, the joint segregations of the resistance gene in Marshall with the T-t and R-r gene pairs that regulate hilum color fit expected ratios for independent assortment.

Joint contribution of the Crop and Soil Enviromental Sciences Dep. and the Plant Pathology, Physiology, and Weed Science Dep., Virginia Polytechnic Inst. and State Univ. The research was partially supported by a grant from the Virginia Soybean Board.

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