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    Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa

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    Journal Article (1.352Mb)
    Date
    2021-01
    Author
    Badu-Apraku, B.
    Bankole, F.A.
    Ajayo, B.S.
    Fakorede, M.A.B.
    Akinwale, R.O.
    Talabi, A.O.
    Bandyopadhyay, R.
    Ortega-Beltran, A.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Northern corn leaf blight (NCLB) incited by the fungus Exserohilum turcicum is a foliar disease that significantly limits maize production and productivity in West and Central Africa (WCA), particularly in the mid-altitudes but during the last decade it has become a menace in lowland agro-ecologies. The most economical and environmentally friendly disease management strategy is the cultivation of maize varieties resistant or tolerant to NCLB. However, no early maturing (EM) and extra-early maturing (EEM) NCLB resistant varieties are commercially available in WCA. One hundred inbred lines each of EM and EEM derived from tropical maize germplasm were inoculated with a virulent isolate of E. turcicum at five locations in Nigeria during the 2017 and 2018 growing seasons. The objective of the study was to identify promising NCLB resistant lines and to investigate inter-relationships among the traits. Analysis of variance revealed highly significant genotype and genotype by environment (G × E) interactions for disease severity, grain yield (GYLD), and other agronomic traits. The average disease severity (TURC) values ranged from 1.9 to 5.8 and 2.9 to 5.7 for the EM and EEM inbred lines, respectively. The levels of reaction of the inbred lines to NCLB ranged from highly resistant to highly susceptible. Stepwise regression analysis showed that ears per plant, ear and plant aspects were significantly influenced by the disease scores. Ears per plant, ear and plant aspects, TURC and GYLD traits were employed to develop a base index (BI) for selecting NCLB resistant inbred lines for hybrid development. TZEI 135 and TZEEI 1 were outstanding in GYLD and also had the highest positive BI values in the EM and EEM inbred lines, respectively. The identification of NCLB resistant lines in this study has set the premise for development of NCLB resistant hybrids for WCA as well as the improvement of tropical maize breeding populations for NCLB resistance.
    https://dx.doi.org/10.1016/j.cropro.2020.105386
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7005
    IITA Authors ORCID
    BAFFOUR BADU-APRAKUhttps://orcid.org/0000-0003-0113-5487
    Ranajit Bandyopadhyayhttps://orcid.org/0000-0003-2422-4298
    Alejandro Ortega-Beltranhttps://orcid.org/0000-0003-3747-8094
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.cropro.2020.105386
    Research Themes
    Biotech and Plant Breeding; Plant Production and Health
    IITA Subjects
    Agronomy; Disease Control; Food Security; Maize; Plant Breeding; Plant Diseases; Plant Production
    Agrovoc Terms
    Maize; Disease Resistance; Germplasm Collections; Screening; Food Production; Early Maturation; Inbred Lines; Agronomic Traits
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Crop Protection
    Collections
    • Journal and Journal Articles4835
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