Progeny Testing of Maize (zea Mays) Genotypes for Grain Yield and Yield Components, Striga Resistance and Fusarium Oxysporum F.sp. Strigae Compatibility

Maize cultivars with resistance to Striga spp. and compatible to Fusarium oxysporum f.sp. strigae (FOS) are an economical, sustainable and environmentally Striga control option. This study's objective was to determine the type and magnitude of gene action controlling grain yield and yield-related components, Striga resistance, FOS compatibility and to select promising maize genotypes for an integrated Striga management approach. Ninety-nine experimental hybrids, generated by a North Carolina mating design II, were evaluated with and without FOS treatment at three Striga-infested sites in western Tanzania. The general (GCA), and specific combining ability (SCA) effects were significant (P < .05) for all the assessed traits with and without FOS except, Striga damage ratings eight (SDR8), and 10 (SDR10) weeks after planting with FOS treatment. FOS-treated progenies had fewer emerged Striga plants than untreated controls. Parental genotypes such as SITUKA M1, TZA4010, TZA4016, TZA4203, JL01, JL05, JL13 and JL17 showed negative GCA effects for all Striga parameters and positive GCA effects for grain yield. The new progenies and selected parents are recommended for Striga resistance breeding.