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Crop Science Abstract -

Association and Inheritance of “Black Chaff” and Stem Rust Reactions in Conley Wheat Crosses1


This article in CS

  1. Vol. 8 No. 4, p. 477-480
    Received: Jan 19, 1968

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  1. Shuh-Ji Sheen,
  2. David C. Ebeltoft and
  3. Glenn S. Smith2



Reactions to “black chaff,” a physiologic disease, and to race 15B of stem rust (Puccinia graminis Pers.f.sp. tritici Eriks. & E. Henn.) were controlled by single partially dominant major genes in several crosses with Conley hard red spring wheat (Triticum aestivum L. en. Thell.). Resistance to stem rust was associated with susceptibility to “black chaff” with apparent linkage values ranging from 21 to 24%. Monosomic study ratios suggested that the controlling genes were located on chromosome 3B.

Major genes for 15B stem rust resistance in ‘Conley’ and CT 231 were different and additive in their effects, giving progenies both transgressively resistant and transgressively susceptible. Controlled temperatures during incubation were used to distinguish the dihybrid genotypes.

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