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This article in CS

  1. Vol. 32 No. 1, p. 275-277
     
    Received: Nov 19, 1990


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doi:10.2135/cropsci1992.0011183X003200010056x

Differentiating Soybean Responses to Heterodera Glycines Races

  1. D. P. Schmitt  and
  2. G. Shannon
  1. D ep. of Plant Pathology, Univ. of Hawaii, Honolulu, HI 96822
    D elta and Pine Land Co., P.O. Box 157, Scott, MS 38772

Abstract

Abstract

Physiological variation among populations of Heterodera glycines Ichinohe, the soybean cyst nematode, has been a problem for soybean [Glycine max (L.) Merr.] growers and scientists. These populations have been classified into 16 races, but the system still leaves ambiguity, especially in the characterization of resistance. Two schemes are proposed: one to classify the nematoder aces and the other to designate the soybean response to the nematode. The existing race system by Riggs and Schmitt still serves as a basis for differentiating populations of H. glycines, but with soybean PI 437654 added as an additional nematode response parameter. A practical system using a popular resistant cultivar as the type for resistance is proposed for advisory purposes. Soybean reactions to parasitism by the nematode are denoted by four levels of resistance: resistant, moderately resistant, moderately susceptible, and susceptible.

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