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Yield gains and associated changes in an early yellow bi-parental maize population following genomic selection for Striga resistance and drought tolerance

dc.contributor.authorBadu-Apraku, B.
dc.contributor.authorTalabi, A.O.
dc.contributor.authorFakorede, M.A.B.
dc.contributor.authorFasanmade, Y.
dc.contributor.authorGedil, M.
dc.contributor.authorMagorokosho, C.
dc.contributor.authorAsiedu, Robert
dc.date.accessioned2019-12-04T11:33:45Z
dc.date.available2019-12-04T11:33:45Z
dc.date.issued2019
dc.identifier.citationBadu-Apraku, B., Talabi, A.O., Fakorede, M.A.B., Fasanmade, Y., Gedil, M., Magorokosho, C. & Asiedu, R. (2019). Yield gains and associated changes in an early yellow bi-parental maize population following genomic selection for Striga resistance and drought tolerance. BMC Plant Biology, 19(1), 129-145.
dc.identifier.issn1471-2229
dc.identifier.urihttps://hdl.handle.net/20.500.12478/5797
dc.descriptionOpen Access Journal; Published online: 5 April 2019
dc.description.abstractBackground Maize yield potential is rarely maximized in sub-Saharan Africa (SSA) due to the devastating effects of drought stress and Striga hermonthica parasitism. This study was conducted to determine the gains in grain yield and associated changes in an early-maturing yellow bi-parental maize population (TZEI 17 x TZEI 11) F3 following genomic selection (GS) for improved grain yield, Striga resistance and drought tolerance. Fifty S1 lines were extracted from each of cycles C0, C1, C2 and C3 of the population and crossed to a tester TZEI 23 to generate 200 testcrosses. The testcrosses were evaluated under drought, artificial Striga-infested and optimal (free from Striga infestation and without limitation of water and nitrogen) environments in Nigeria, 2014-2017. Results Gains in grain yield of 498 kg ha− 1 cycle− 1 (16.9% cycle− 1) and 522 kg ha− 1 cycle− 1 (12.6% cycle− 1) were obtained under Striga-infested and optimal environments, respectively. The yield gain under Striga-infested environments was associated with increased plant and ear heights as well as improvement in root lodging resistance, husk cover, ear aspect and Striga tolerance. Under optimal environments, yield gain was accompanied by increase in plant and ear heights along with improvement of husk cover and ear rot resistance. In contrast, genomic selection did not improve grain yield under drought but resulted in delayed flowering, poor pollen-silk synchrony during flowering and increased ear height. Genetic variances and heritabilities for most measured traits were not significant for the selection cycles under the research environments. Ear aspect was a major contributor to grain yield under all research environments and could serve as an indirect selection criterion for simultaneous improvement of grain yield under drought, Striga and optimal environments. Conclusion This study demonstrated that genomic selection was effective for yield improvement in the bi-parental maize population under Striga-infested environments and resulted in concomitant yield gains under optimal environments. However, due to low genetic variability of most traits in the population, progress from further genomic selection could only be guaranteed if new sources of genes for Striga resistance and drought tolerance are introgressed into the population.
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.format.extent129-145
dc.language.isoen
dc.rightsCC-BY-4.0
dc.subjectGenomics
dc.subjectSelection
dc.subjectStriga
dc.subjectDrought Tolerance
dc.subjectMaize
dc.subjectNigeria
dc.subjectYields
dc.subjectDrought Tolerance
dc.subjectGrain
dc.titleYield gains and associated changes in an early yellow bi-parental maize population following genomic selection for Striga resistance and drought tolerance
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpMaize
cg.contributor.crpRoots, Tubers and Bananas
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationObafemi Awolowo University
cg.contributor.affiliationInternational Maize and Wheat Improvement Center
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.creator.identifierBAFFOUR BADU-APRAKU: 0000-0003-0113-5487
cg.creator.identifierMelaku Gedil: 0000-0002-6258-6014
cg.creator.identifierRobert Asiedu: 0000-0001-8943-2376
cg.researchthemeBIOTECH & PLANT BREEDING
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectMaize
cg.iitasubjectSmallholder Farmers
cg.journalBMC Plant Biology
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid105172
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1186/s12870-019-1740-z


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