Inheritance of resistance in alfalfa to bacterial wilt
1947
Wilson, M.C. Jr
1. Data are presented demonstrating that the resistance of alfalfa to bacterial wilt can be resolved into terms of separate genes and possibly four partially dominant genes differing in strength resistance were isolated. 2. The available data suggest that one of these, the P gene, will give adequate protection against bacterial wilt, and that it can be used to breed resistant varieties. Homozygous P gave 72% healthy, 20% intermediate, and 8% severely diseased plants. In comparison, the susceptible California Common gave 2% healthy, 7% intermediate, and 91% severely diseased plants. 3. Clones from individual plants demonstrated that a single genotype might vary from healthy to severely diseased even under rather uniform conditions. 4. Inoculating clones containing 5 to 10 plants is a promising method of identifying self-sterile F2 or backcross plants as resistant or susceptible.
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