Phenotypic data of combining ability and heterotic grouping of turcicum-resistant early-maturing maize inbreds

Maize (Zea mays L.), an important source of calories and nutrients in sub-Saharan Africa, is threatened by northern corn leaf blight (NCLB) caused by Exserohilum turcicum. This study examined combining ability and heterotic patterns of earlymaturing maize inbreds, gene action conditioning NCLB resistance, and performance of derived hybrids across environments and identified testers. Fifteen each of white and yellow inbreds were intercrossed using North Carolina Design II to obtain 75 hybrids per endosperm color. Hybrids plus six checks were inoculated with a virulent isolate of E. turcicum 4 wk after planting in six inoculated and three non-inoculated environments in Nigeria in 2018 and 2019. Inbreds were assigned to heterotic groups using general combining ability (GCA) of multiple traits method. Specific combining ability (SCA), GCA, and genotype × environment (G × E) interactions were significant for grain yield (GYLD), disease severity, and other traits. Northern corn leaf blight caused 46% GYLD reduction. The effects of GCA were preponderant over SCA for GYLD and NCLB severity across environments, indicating that hybridization and recurrent selection would enhance genetic gains and hybrid performance. White and yellow inbreds were placed in two and three heterotic groups, respectively. High-yielding NCLB-resistant testers identified could be used to classify other inbreds yet to be field-tested into heterotic groups. Genotypes TZEI 32 × TZEI 5 and TZEI 124 × TZEI 134 were identified as single-cross testers. Genotypes TZEI 32 × TZEI 5 and TZEI 5 × TZEI 75 (white) and TZEI 124 × TZEI 134 and TZEI 124 × TZEI 11 (yellow)were identified for on-farmtesting and possible commercialization.

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Field Value
Creator Badu-Apraku, Baffour
Creator Affiliation International Institute of Tropical Agriculture (IITA)
Creator ID Type ORCID
Creator ID 0000-0003-0113-5487
Subject Vocab (AGROVOC/GACS/CAB) Disease, Anthesis, Silk, Plant height, Location, Replication, Pedigrees, Husks, Maize, Early maturation
Subject(s) Turcicum, Severity score, Tassel blast, Root lodging, Anthesis silking interval, Stalk lodging, Ear harvest, Grain moisture, Leaf death, Leaf firing, Leaf blight
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Faith A. Bankole, Morakinyo A. B. Fakorede, Gregory Ogbe, Ranajit Bandyopadhyay, Alejandro Ortega-Beltran
Contributor Role Data Anaylyst
Contributor Project Lead Organisation Center International Institute of Tropical Agriculture (IITA)
Contributor Project Lead Center International Institute of Tropical Agriculture (IITA)
Contributor CRP CGIAR Research Program on Maize
Contributor Partner Not applicable
Contributor Donor Bill and Melinda Gates Foundation (BMGF)
Contributor Project Stress Tolerant Maize for Africa (STMA)
Project ID PJ-002411
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2017-01-28
Embargo End Date 2019-12-28
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/fgty-g146/d
Identifier Citation
Source Stress Tolerant Maize for Africa (STMA)
Language English
Relation Not applicable
Agroecological Zone Subhumid warm tropics
Coverage Region Western Africa
Coverage country Nigeria
Coverage Admin Unit Not applicable
Coverage Y (Latitude) 9.60004
Coverage X (Longitude) 7.99997
Coverage Start Date
Coverage End Date
Contact Badu-Apraku, Baffour; Maize Breeder; International Institute of Tropical Agriculture (IITA)
Contact Email b.badu-apraku@cgiar.org
Restriction CC-BY 4.0
Email Permission None
Rights CC-BY 4.0