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Line × tester analysis of maize grain yield under acid and non‐acid soil conditions

Creator: Mutimaamba, C.
Creator: MacRobert, J.F.
Creator: Cairns, J.E.
Creator: Magorokosho, C.
Creator: Thokozile Ndhlela
Creator: Mukungurutse, C.
Creator: Minnaar-Ontong, A.
Creator: Labuschagne, M.
Year: 2020
Language: English
Publisher: CSSA
Publisher: Wiley
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
Type: Article
Place of Publication: USA
Pages: 991-1003
Issue: 2
Volume: 60
DOI: 10.1002/csc2.20009
Description: Soil acidity has received less attention than other biophysical stresses such as drought and low N, despite accounting for a considerable reduction in maize (Zea mays L.) productivity in many parts of southern Africa. The line × tester mating design was used to determine the general combining ability (GCA) for grain yield of 14 maize inbred lines and the specific combining ability (SCA) of their corresponding crosses. Thirty‐three single‐cross hybrids were evaluated under acid and optimum soils across 11 environments over three seasons. Across environments, mean grain yield reduction ranged from 11 to 37% due to low pH. Additive gene action was more important than nonadditive gene action for grain yield under both soil conditions. Tester GCA effects were larger for grain yield than GCA effects of lines and SCA effects of crosses for both soil conditions. Tester GCA effects were less sensitive to environmental fluctuations than line GCA effects and SCA effects of crosses. Cross combinations with desirable SCA effects for grain yield were associated with high per se grain yield, which suggests that SCA was a good predictor of grain yield in this study. These crosses consisted of good × good and good × poor general combiners, which indicates that GCA was a good predictor of grain yield. Therefore, priority should be given for yield selection in progenies and hybridization of specific crosses with desirable SCA when breeding acid‐soil‐tolerant maize.
Agrovoc: MAIZE
ISSN: 1435-0653
Journal: Crop Science

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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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