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    Evaluating consistency of resistance reactions of openpollinated maize cultivars to Striga hermonthica (Del.) Benth under artificial infestation

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    Date
    2012-05
    Author
    Menkir, A.
    Franco, J.
    Adepoju, A.
    Bossey, B.
    Type
    Journal Article
    Metadata
    Show full item record
    Abstract/Description
    Striga hermonthica (Del.) Benth is a destructive parasitic weed to maize (Zea mays L.) in West and Central Africa. The presence of large genetic variation among parasite populations contributes to significant genotype × environment interaction, complicating assessment of resistance reactions of genotypes in field trails. The present study was conducted at Abuja and Mokwa in Nigeria for 5 and 6 yr, respectively, with and without artificial Striga infestation (i) to examine the reaction patterns of open-pollinated maize cultivars with varying levels of resistance to S. hermonthica and (ii) to identify cultivars or genotypes with stable resistance to the parasite across varying growing environments. In the combined analysis of variance, cultivar and cultivar × environment interaction significantly affected grain yield, emerged Striga plant count, and Striga damage rating under Striga infested condition. The nonparametric test of concordance was significant (p < 0.0001) and strong (coefficient of concordance [W] = 0.71 to 0.83) for the three traits recorded under infestation, indicating consistent ranking of the resistance reactions of the cultivars to S. hermonthica across environments. Both additive main effects and multiplicative interaction (AMMI) and cluster analyses of each trait recorded under infestation across environments placed the resistant cultivars in one group and the tolerant and susceptible cultivars in a second group. Further analysis of stability of rank order of individual cultivars across environments using nonparametric tests did not indicate any instability of the resistance reactions of the eight open-pollinated maize cultivars. The resistant cultivars had low average ranks for grain yield under infestation, Striga damage rating, and emerged Striga plant count whereas the reverse was true for both the tolerant and susceptible cultivars. Cultivars with stable resistance, which can be used directly for cultivation or as sources of resistance alleles for breeding, were identified in this study.
    https://dx.doi.org/10.2135/cropsci2011.10.0543
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1390
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.2135/cropsci2011.10.0543
    IITA Subjects
    Maize; Genetic Improvement
    Agrovoc Terms
    Genotypes; Maize; Plant; Resistance; Cultivar; Striga Hermonthica
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Crop Science
    Collections
    • Journal and Journal Articles4835
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