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

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....

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Autores principales: Badu-Apraku, Baffour, Bankole, Faith Ayobami, Ajayo, Babatope Samuel, Fakorede, Morakinyo Abiodun Bamidele, Akinwale, Richard Olutayo, Talabi, Abidemi Olutayo, Bandyopadhyay, Ranajit, Ortega-Beltran, Alejandro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Butterworth 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7649949/
https://www.ncbi.nlm.nih.gov/pubmed/33390640
http://dx.doi.org/10.1016/j.cropro.2020.105386
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author Badu-Apraku, Baffour
Bankole, Faith Ayobami
Ajayo, Babatope Samuel
Fakorede, Morakinyo Abiodun Bamidele
Akinwale, Richard Olutayo
Talabi, Abidemi Olutayo
Bandyopadhyay, Ranajit
Ortega-Beltran, Alejandro
author_facet Badu-Apraku, Baffour
Bankole, Faith Ayobami
Ajayo, Babatope Samuel
Fakorede, Morakinyo Abiodun Bamidele
Akinwale, Richard Olutayo
Talabi, Abidemi Olutayo
Bandyopadhyay, Ranajit
Ortega-Beltran, Alejandro
author_sort Badu-Apraku, Baffour
collection PubMed
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.
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spelling pubmed-76499492021-01-01 Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa Badu-Apraku, Baffour Bankole, Faith Ayobami Ajayo, Babatope Samuel Fakorede, Morakinyo Abiodun Bamidele Akinwale, Richard Olutayo Talabi, Abidemi Olutayo Bandyopadhyay, Ranajit Ortega-Beltran, Alejandro Crop Prot Perspectives in Crop Protection 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. Butterworth 2021-01 /pmc/articles/PMC7649949/ /pubmed/33390640 http://dx.doi.org/10.1016/j.cropro.2020.105386 Text en © 2020 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Perspectives in Crop Protection
Badu-Apraku, Baffour
Bankole, Faith Ayobami
Ajayo, Babatope Samuel
Fakorede, Morakinyo Abiodun Bamidele
Akinwale, Richard Olutayo
Talabi, Abidemi Olutayo
Bandyopadhyay, Ranajit
Ortega-Beltran, Alejandro
Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title_full Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title_fullStr Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title_full_unstemmed Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title_short Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa
title_sort identification of early and extra-early maturing tropical maize inbred lines resistant to exserohilum turcicum in sub-saharan africa
topic Perspectives in Crop Protection
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7649949/
https://www.ncbi.nlm.nih.gov/pubmed/33390640
http://dx.doi.org/10.1016/j.cropro.2020.105386
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