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Genetic gains in grain yield of a maize population improved through marker assisted recurrent selection under stress and non-stress conditions in west Africa

dc.contributor.authorAbdulmalik, R.O.
dc.contributor.authorMenkir, A.
dc.contributor.authorMeseka, S.K.
dc.contributor.authorUnachukwu, N.N.
dc.contributor.authorAdo, S.G.
dc.contributor.authorOlarewaju, J.D.
dc.contributor.authorAba, D.A.
dc.contributor.authorHearne, S.
dc.contributor.authorCrossa, J.
dc.contributor.authorGedil, M.
dc.date.accessioned2019-12-04T11:08:43Z
dc.date.available2019-12-04T11:08:43Z
dc.date.issued2017-05-22
dc.identifier.citationAbdulmalik, R.O., Menkir, A., Meseka, S.K., Unachukwu, N., Ado, S.G., Olarewaju, J.D., ... & Gedil, M. (2017). Genetic gains in grain yield of a maize population improved through marker assisted recurrent selection under stress and non-stress conditions in west Africa. Frontiers in Plant Science, 8(841), 1-11
dc.identifier.issn1664-462X
dc.identifier.urihttps://hdl.handle.net/20.500.12478/1896
dc.descriptionOpen Access Journak
dc.description.abstractMarker-assisted recurrent selection (MARS) is a breeding method used to accumulate favorable alleles that for example confer tolerance to drought in inbred lines from several genomic regions within a single population. A bi-parental cross formed from two parents that combine resistance to Striga hermonthica with drought tolerance, which was improved through MARS, was used to assess changes in the frequency of favorable alleles and its impact on inbred line improvement. A total of 200 testcrosses of randomly selected S1 lines derived from the original (C0) and advanced selection cycles of this bi-parental population, were evaluated under drought stress (DS) and well-watered (WW) conditions at Ikenne and under artificial Striga infestation at Abuja and Mokwa in Nigeria in 2014 and 2015. Also, 60 randomly selected S1 lines each derived from the four cycles (C0, C1, C2, C3) were genotyped with 233 SNP markers using KASP assay. The results showed that the frequency of favorable alleles increased with MARS in the bi-parental population with none of the markers showing fixation. The gain in grain yield was not significant under DS condition due to the combined effect of DS and armyworm infestation in 2015. Because the parents used for developing the bi-parental cross combined tolerance to drought with resistance to Striga, improvement in grain yield under DS did not result in undesirable changes in resistance to the parasite in the bi-parental maize population improved through MARS. MARS increased the mean number of combinations of favorable alleles in S1 lines from 114 in C0 to 124 in C3. The level of heterozygosity decreased by 15%, while homozygosity increased by 13% due to the loss of some genotypes in the population. This study demonstrated the effectiveness of MARS in increasing the frequency of favorable alleles for tolerance to drought without disrupting the level of resistance to Striga in a bi-parental population targeted as a source of improved maize inbred lines.
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.format.extent1-11
dc.language.isoen
dc.subjectMaize
dc.subjectGenetic Gain
dc.subjectAllele Frequency
dc.subjectBi-Parental Cross
dc.subjectMars
dc.subjectDrought Tolerance
dc.subjectStriga Hermonthica
dc.subjectBreeding
dc.subjectGenotypes
dc.subjectDna
dc.subjectMarker-Assisted Recurrent Selection
dc.titleGenetic gains in grain yield of a maize population improved through marker assisted recurrent selection under stress and non-stress conditions in west Africa
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpMaize
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationAhmadu Bello University
cg.contributor.affiliationInternational Maize and Wheat Improvement Center
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.researchthemeBIOTECH & PLANT BREEDING
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectGenetic Improvement
cg.iitasubjectMaize
cg.iitasubjectPests Of Plants
cg.iitasubjectPlant Breeding
cg.iitasubjectPlant Diseases
cg.iitasubjectPlant Ecology
cg.iitasubjectPlant Genetic Resources
cg.journalFrontiers in Plant Science
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid83998
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.3389/fpls.2017.00841


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