Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 2/5/2006
Publication Date: 6/1/2006
Citation: Timper, P., Wilson, J.P. 2006. Root-knot nematode resistance in African pearl millets [abstract]. Phytopathology. 96:S188.
Technical Abstract: Resistance to Meloidogyne incognita in pearl millet reduces nematode populations that can damage crops grown in rotations. Pearl millets from Africa were evaluated as sources of resistance. Seventeen pearl millets were evaluated as bulk (S0) populations. All African varieties expressed some level of resistance. P3Kollo was among the least resistant, Zongo and Gwagwa were intermediate, and SoSat-C88 was among the most resistant. Thirty selfed (S1) progenies from SoSat-C88, Gwagwa, Zongo, and P3Kollo were evaluated for heterogeneity of resistance and reactions were verified in 13 S2 progeny. In S1 evaluations, variety was heterogeneous for resistance. Patterns of apparent segregation of resistance varied among the four varieties. Discreet resistant and susceptible phenotypes were identified in Zongo. We estimate two dominant genes for resistance segregated in this variety. Reproduction of M. incognita on S2 progeny tended to confirm the results from S1 progeny inoculations. Heritability of nematode reproduction by parent-offspring regression was 0.54. Realized heritability by divergent selection was 0.87.