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Phenotypic and genotypic variation in tropical maize inbred lines for resistance to the maize weevil and larger grain borer

Author: Mwololo, J.K.
Author: Okori, P.
Author: Mugo, S.
Author: Tadele Tefera
Author: Yoseph, B.
Author: Otim, M.
Author: Munyiri, S.W.
Year: 2012
ISSN: 2250-0057
URI: http://hdl.handle.net/10883/3183
Abstract: The maize weevil (Sitophilus zeamais) and larger grain borer (Prostephanus truncatus) are economicallyimportant postharvest insect pests that cause severe losses in stored grain. The use of host-plant resistance is the most effective and benign way of overcoming storage-pest damage. The objectives of this study were to estimate heritability and to identify maize inbred lines with dual resistance to weevil and larger grain borer (LGB). One hundred and twenty (120) inbred lines were evaluated in the field for adaptation and tested in the laboratory for resistance to the LGB and weevil. Insect-damage parameters namely grain damage, weight loss, flour weight and number of insects, were measured. Heritability, genotypic and phenotypic variances for the damage traits were determined. Genotype stability for insect pest resistance was determined based on genotypic variance and coefficient of variation (CVi) for each genotype. There were significant differences (P<0.001) among the lines for all the traits measured. Heritability values were high (ranging from 0.7-0.9) in all the traits, and the genotypic variance was higher (ranging from 0.012-0.04) than the environmental variances (0.007-0.033) for all the traits. Dual resistance and stability were observed in CKSPL10028, CKSPL10035, CKSPL10088, CKSPL10021, CKSPL10042, CKSPL10295 and CKSPL10112.
Language: English
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 CIMMYT-Knowledge-Center@cgiar.org 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
Region: Global
Pages: 41-52
Journal issue: 4
Journal: International Journal of Agricultural Science and Research
Journal volume: 2
Keywords: Postharvest Insect Pests
Keywords: Prostephanus truncatus
Keywords: Sitophilus zeamais
Keywords: Host-plant resistance
Publisher URI: http://tjprc.org/view_archives.php?year=2012&id=50&jtype=2&page=2


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

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