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  1. Vol. 28 No. 4, p. 714-715
     
    Received: Sept 28, 1987


    * Corresponding author(s):
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doi:10.2135/cropsci1988.0011183X002800040034x

Evidence of Pathogen Specificity in Tolerance of Soybean Cultivars to Phytophthora Rot

  1. P. R. Thomison ,
  2. C. A. Thomas,
  3. W. J. Kenworthy and
  4. M. S. McIntosh
  1. Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742
    USDA-ARS Beltsville Agric. Res. Ctr., Beltsville, MD 20705

Abstract

Abstract

The recent appearance of new races of the soybean [Glycine max (L.) Merr.] pathogen Phytophthora megasperma f.sp. glycinea (Pmg) has prompted breeders to consider the use of tolerance as an alternative to race-specific resistance. The objective of this study was to evaluate the tolerance of cultivars to different isolates and races of Pmg. The tolerance reactions of ‘Essex’, ‘Williams’, ‘York’, and ‘Ware’ to isolates of Races 1, 5, 10, and 24 were determined by transplanting 4-d-old seedlings into media infested with Pmg and measuring the effect on plant growth. The reactions indicate that some isolates differ only in virulence and that others differ in pathogenicity. Soybean cultivars selected for tolerance to a limited number of Pmg isolates/races may not necessarily be tolerant to others.

Contribution no. 7770 of the Maryland Agric. Exp. Stn. Supported in part by a grant from the Maryland Soybean Board.

Supported in part by a grant from the Maryland Soybean Board.

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