Genetic analysis of grain yield and agronomic traits of early provitamin A quality protein maize inbred lines in contrasting environments

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dc.contributor.author Obeng-Bio, E.
dc.contributor.author Badu-Apraku, B.
dc.contributor.author Ifie, B.E.
dc.contributor.author Danquah, A.
dc.contributor.author Blay, E.T.
dc.contributor.author Annor, B.
dc.date.accessioned 2019-12-11T09:50:12Z
dc.date.available 2019-12-11T09:50:12Z
dc.date.issued 2019-10-17
dc.identifier.citation Obeng-Bio E, Badu-Apraku B, Ifie BE, Danquah A, Blay ET, Annor B (2019). Genetic analysis of grain yield and agronomic traits of early provitamin A quality protein maize inbred lines in contrasting environments. The Journal of Agricultural Science 157, 413–433. https://doi.org/10.1017/ S0021859619000753 en_US
dc.identifier.other https://doi.org/10.1017/ S0021859619000753
dc.identifier.uri http://ugspace.ug.edu.gh/handle/123456789/34122
dc.description Research Article en_US
dc.description.abstract Early-maturing provitamin A (PVA) quality protein maize (QPM) hybrids with combined drought and low soil nitrogen (low-N) tolerance are needed to address malnutrition and food security problems in sub-Saharan Africa (SSA). The current study’s objectives were to (i) examine combining ability of selected early maturing PVA-QPM inbreds for grain yield and other agronomic traits under drought, low-N, optimal environments and across environments, (ii) determine gene action conditioning PVA accumulation under optimal environments, (iii) classify inbreds into heterotic groups and identify testers and (iv) assess yield and stability of hybrids across environments. Ninety-six hybrids generated from 24 inbred lines using the North Carolina Design II together with four commercial hybrid controls were evaluated under drought, low-N and optimal environments in Nigeria in 2016 and 2017. Fifty-four selected hybrids were assayed for PVA carotenoid and tryptophan content. Additive genetic effects were greater than non-additive effects for grain yield and most agronomic traits under each and across environments. The gene action conditioning accumulation of PVA carotenoids under optimal growing conditions followed a pattern similar to that of grain yield and other yield-related traits. The inbred lines were categorized into four heterotic groups consistent with the pedigree records and with TZEIORQ 29 identified as the best male and female tester for heterotic group IV. No tester was found for the other groups. Hybrid TZEIORQ 24 × TZEIORQ 41 was the highest yielding and most stable across environments and should be further tested for consistent performance for commercialization in SSA. en_US
dc.description.sponsorship USAID through the West Africa Centre for Crop Improvement (WACCI), and the Bill and Melinda Gates Foundation through the DTMA/STMA Projects. en_US
dc.language.iso en en_US
dc.publisher The Journal of Agricultural Science en_US
dc.relation.ispartofseries 154;5
dc.subject Drought tolerance en_US
dc.subject low-N tolerance en_US
dc.subject provitamin A en_US
dc.subject quality protein maize en_US
dc.subject Zea mays L en_US
dc.title Genetic analysis of grain yield and agronomic traits of early provitamin A quality protein maize inbred lines in contrasting environments en_US
dc.type Article en_US


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