Reference Report for downy_ref2
| Title: | Inheritance of resistance of soybean to Peronospora manshurica |
| Authors: | Geeseman, G.E. |
| Source: | Agron. J. 1950, 42(12):608-613 |
| Abstract: | A tabulated survey is given of studies conducted at the Wisconsin Agricultural Experiment Station in 1947-8 to determine the mode of inheritance of factors for resistance of soyabeans to three physiologic races of downy mildew (Peronospora manshurica) [R.A.M., 30, p. 94]. In susceptible resistant crosses resistance to races 1 and 2 appeared to be controlled by one pair of factors and was partially dominant, whereas the reactions of the progeny of two susceptible varieties suggested two complementary factors. Resistance to race 3 was governed by a single factor pair in the cross Dunfield Illini. Two factors Mi2 and MiR', conditioned resistance in the cross Mukden Richland, the former factor being epistatic to the latter. Two complementary factors (Mi1 and Mi2) plus MiR conferred resistance in the cross Illini Richland. The MiR factor was hypostatic to the others. Independent segregation of the three genes was indicated. The comparison of the F3 reactions to the three races indicated that the same major factors regulated resistance to all. The presence of two or more dominant genes (M1 M2) confers high resistance to races 1 and 3 and slight susceptibility to race 2. MiR, influencing reaction to race 3, appears to be recessive in Mukden and dominant in Richland. The genotypes of the susceptible Illini, Richland (semi-resistant to race 3 otherwise susceptible), and the three resistant varieties, Dunfield, Chief, and Mukden, are given. |
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