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Genetic studies of extra-early provitamin-A maize inbred lines and their hybrids in multiple environments

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Title Genetic studies of extra-early provitamin-A maize inbred lines and their hybrids in multiple environments
 
Creator Badu-Apraku, B.
Fakorede, M.A.B.
Talabi, A.O.
Oyekunle, M.
Aderounmu, M.
Lum, A.F.
Ribeiro, P.F.
Adu, G.B.
Toyinbo, J.O.
 
Subject MAIZE
FOOD SECURITY
DROUGHT TOLERANCE
STRIGA
STRIGA HERMONTHICA
SUBSAHARAN AFRICA
GENETICS
INBRED LINES
 
Description Open Access Article; Published online: 25 Sept 2019
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 and 22.56 μg g-1 were obtained for TZEEIOR 202 and TZEEIOR 205. TZEEIOR 197 × 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 μgg-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 × TZEEIOR205 (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.
Bill & Melinda Gates Foundation
Peer Review
 
Date 2019-10-10T10:14:24Z
2019-10-10T10:14:24Z
2019
 
Type Journal Article
 
Identifier Badu-Apraku, B., Fakorede, M.A.B., Talabi, A.O., Oyekunle, M., Aderounmu, M., Lum, A.F. & Toyinbo, J.O. (2019). Genetic studies of extra-early provitamin-A maize inbred lines and their hybrids in multiple environments. Crop Science, 1-51.
0011-183X
https://hdl.handle.net/10568/104027
 
Language en
 
Rights CC-BY-4.0
 
Format 1-51
 
Source Crop Science