Inheritance of Resistance to Bacterial Blight (Pseudomonas glycinea Coerper) in Soybeans (Glycine max L.)
1966
Mukherjee, Debabrata | Lambert, J. W. | Cooper, R. L. | Kennedy, B. W.
Parents and F₃ families of seven soybean crosses were studied for reaction to the bacterial blight organism, Pseudomonas glycinea Coerper. Six of the crosses were tested in both the field and the greenhouse to a single colony isolate of the organism obtained at St. Paul, Minnesota, and four were tested under similar conditions to an isolate from Morris, Minnesota. The two isolates gave distinctly different reactions on the populations studied, indicating the presence of pathogenic races. Also, varietal reactions varied somewhat with the environments used in testing. Resistance to the St. Paul isolate, designated race 1, was attributed to a single dominant gene, possessed by the varieties ‘Norchief,’ ‘Harosoy,’ and P.I. 132,207. The proposed symbol for this gene is Rpg₁. The inheritance of resistance to the Morris isolate, race 2, appeared to involve more than one gene. Delineation of detail, however, must await further study.
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