Evaluation of Extra-Early-Maturing Provitamin A Maize Diallel Crosses

Vitamin A deficiency, drought, low soil nitrogen (low N) and Striga hermonthica parasitism of maize (Zea mays L.) cause malnutrition and food insecurity in sub-Saharan Africa. The objectives of this study were to determine combining abilities of extra-early provitamin A (PVA) lines, classify them into heterotic groups (HGs), identify testers, and determine yield stability of hybrids under contrasting environments in two trials. In trial 1, 20 extra-early PVA lines were inter-mated in a diallel mating scheme to obtain 190 F1 hybrids. The 190 F1 hybrids plus six checks were tested under Striga infestation, drought, and stress-free environments in Nigeria from 2015 to 2017. In trial 2, 35 extra-early yellow hybrids were evaluated under low-N, Striga-infested and stress-free environments in 2018. Provitamin A concentrations of 23.98 36 and 22.56 µg g-1 were obtained for TZEEIOR 202 and TZEEIOR 205. TZEEIOR 197 × 37 TZEEIOR 205 (20.1 μg g-1) and TZEEIOR 202 × TZEEIOR 205 (22.7 μg g-1) contained about double the PVA level of the commercial check, TZEEI 58 × TZEE-Y Pop STR C5 (11.4 μg 39 g -1). Both general (GCA) and specific (SCA) combining ability variances were statistically significant for most agronomic traits, although GCA was much larger than SCA effects, indicating that additive genetic effects primarily controlled the inheritance of those traits. TZEEIOR 97 and TZEEIOR 197 were identified as inbred testers. TZEEIOR 197 × TZEEIOR 205 (20.1 μg g-1) was identified as a single-cross tester as well as the most stable and highest yielding hybrid across environments. TZEEIOR 202 and TZEEIOR 205 should be invaluable resources for breeding for high PVA. PVA level was independent of hybrid yield potential, indicating that selection of superior hybrids with elevated PVA levels should be feasible.


Data and Resources

Additional Info

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) Drought, Combining ability, Maize, Striga, Ear, Hybrids, Provitamins, Stress, Pollen, Anthesis, Inbred lines
Subject(s) Root lodging, STMA, Stalk lodging
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Fakorede, M.A.B., Talabi, A. O., Oyekunle, M. Aderounmu, M., Lum, A. F., Ribeiro, P. F., Adu, G. B., Toyinbo, J.O
Contributor Role Other
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
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2017-11-06
Embargo End Date
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/g8y5-2377/d
Identifier Citation Genetic studies of extra-early provitamin-A maize inbred lines and their hybrids in multiple environments, Badu-Apraku, B., Fakorede, M.*, Talabi, A. O., Oyekunle, M.*, Aderounmu, M., Lum, A. F.*, Ribeiro, P. F., Adu, G. B.* and Toyinbo, J. O., in: Crop Science, pages 1-51, ISSN 0011-183X, 2019.
Source Stress Tolerant Maize for Africa (STMA)
Language English
Relation Not applicable
Agroecological Zone Semiarid warm tropics
Coverage Region Western Africa
Coverage country Nigeria
Coverage Admin Unit Not applicable
Coverage Y (Latitude) 9.082
Coverage X (Longitude) 8.67528
Coverage Start Date 2015-02-05
Coverage End Date 2017-11-06
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