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Crop Science Abstract -

Sources and Inheritance of Resistance to Phytophthora megasperma var. sojae in Soybeans


This article in CS

  1. Vol. 8 No. 3, p. 329-330
    Received: Nov 8, 1967

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  1. A. Lam-Sanchez,
  2. A. H. Probst,
  3. F. A. Laviolette,
  4. J. F. Schafer and
  5. K. L. Athow2



Inheritance of resistance to Phytophthora megasperma var. sojae in soybeans was studied in a group of crosses involving nine resistant varieties, originally from fairly diverse geographical areas. Each of eight resistant varieties was crossed to the ninth, ‘Mukden,’ or one of its resistant backcross derivatives (‘Lindarin 63’ or ‘Clark 63’), and seven also were crossed to the susceptible varieties ‘Wabash,’ ‘Lindarin,’ or ‘Clark.’ From inoculation tests performed on F3 progenies of F2 plants of crosses between susceptible x resistant parents, monohybrid segregations were obtained, indicating that the resistance to phytophthora rot of soybeans is conditioned by a single dominant gene in each case. Inoculation tests on F2 populations of crosses between resistant parents gave no segregation, suggesting that all resistant parents have Mukden-type resistance reported by Bernard et al. (1) and assigned the gene Rps (formerly Ps).

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