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....
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Elsevier
2021
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/110378 |
| _version_ | 1855537855553601536 |
|---|---|
| author | Badu-Apraku, Baffour Bankole, F.A. Ajayo, B.S. Fakorede, M.A.B. Akinwale, R.O. Talabi, A.O. Bandyopadhyay, Ranajit Ortega Beltran, A. |
| author_browse | Ajayo, B.S. Akinwale, R.O. Badu-Apraku, Baffour Bandyopadhyay, Ranajit Bankole, F.A. Fakorede, M.A.B. Ortega Beltran, A. Talabi, A.O. |
| author_facet | Badu-Apraku, Baffour Bankole, F.A. Ajayo, B.S. Fakorede, M.A.B. Akinwale, R.O. Talabi, A.O. Bandyopadhyay, Ranajit Ortega Beltran, A. |
| author_sort | Badu-Apraku, Baffour |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| 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. |
| format | Journal Article |
| id | CGSpace110378 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace1103782025-11-11T10:44:32Z Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa Badu-Apraku, Baffour Bankole, F.A. Ajayo, B.S. Fakorede, M.A.B. Akinwale, R.O. Talabi, A.O. Bandyopadhyay, Ranajit Ortega Beltran, A. maize disease resistance germplasm collections screening food production early maturation inbred lines agronomic traits 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. 2021-01 2020-12-03T10:24:52Z 2020-12-03T10:24:52Z Journal Article https://hdl.handle.net/10568/110378 en Open Access application/pdf Elsevier Badu-Apraku, B., Bankole, F.A., Ajayo, B.S., Fakorede, M.A.B., Akinwale, R.O., Talabi, A.O., ... & Ortega-Beltran, A. (2021). Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa. Crop Protection, 139, 105386: 1-10. |
| spellingShingle | maize disease resistance germplasm collections screening food production early maturation inbred lines agronomic traits Badu-Apraku, Baffour Bankole, F.A. Ajayo, B.S. Fakorede, M.A.B. Akinwale, R.O. Talabi, A.O. Bandyopadhyay, Ranajit Ortega Beltran, A. 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 | maize disease resistance germplasm collections screening food production early maturation inbred lines agronomic traits |
| url | https://hdl.handle.net/10568/110378 |
| work_keys_str_mv | AT baduaprakubaffour identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT bankolefa identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT ajayobs identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT fakoredemab identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT akinwalero identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT talabiao identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT bandyopadhyayranajit identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica AT ortegabeltrana identificationofearlyandextraearlymaturingtropicalmaizeinbredlinesresistanttoexserohilumturcicuminsubsaharanafrica |