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This article in CS

  1. Vol. 28 No. 1, p. 41-43
    Received: Mar 4, 1987

    * Corresponding author(s):
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Identification of Two Dominant Genes Conditioning Brown Stem Rot Resistance in Soybean

  1. P. M. Hanson,
  2. C. D. Nickell ,
  3. L. E. Gray and
  4. S. A. Sebastian
  1. U SDA-ARS, Dep. of Plant Pathology, Univ. of Illinois
    S tine-Lab, Newark, DE 19714



Brown stem rot (BSR), caused by Phialophora gregata (Allington and Chamberlain) W. Gains, is an important disease of soybean [Glycine max (L.) Merr.] especially in the North Central USA. This study was conducted to provide an additional generation of data to confirm the presence of a single dominant allele for BSR resistance in L78-4094, to determine the number of alleles conditioning BSR resistance in PI437833, and to study the relationship between BSR resistant alleles in PI437833 and L78-4094. Plants (F2) of LN78-2714 BSR-susceptible (S) × L78-4094 BS R-resistant (R), F2plants and F,2:3 families of crosses PI437833 (R) × ‘Century’ (S) an PI437833 (R) × L78-4094 (R) were inoculated in the greenhouse and evaluated for BSR resistance. Plants were classified as resistant or susceptible based on the presence or absence of leaf necrosis 5 weeks after inoculation. The BSR resistance in L78-4094 is conditioned by a dominant allele, designated Rbs, and the BSR resistance in PI437833 is governed by a dominant allele different from ,Rbs1, designated Rbs2.

Research, supported in part by the Illinois Soybean Program Opertating Board, was from a thesis by the senior author in partial fulfillment of the requirements for the Ph. D. degree at the Univ. of Illinois.

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