Formation of heterotic groups and understanding genetic effects in a provitamin a biofortified maize breeding program

dc.creatorSuwarno, W.B.
dc.creatorPixley, K.V.
dc.creatorPalacios-Rojas, N.
dc.creatorKaeppler, S.M.
dc.creatorBabu, R.
dc.date2014-03-05T17:59:53Z
dc.date2014-03-05T17:59:53Z
dc.date2014
dc.date.accessioned2023-07-17T19:57:32Z
dc.date.available2023-07-17T19:57:32Z
dc.identifier1435-0653
dc.identifierhttp://hdl.handle.net/10883/3437
dc.identifier10.2135/cropsci2013.02.0096
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7509192
dc.descriptionDeveloping biofortified maize cultivars is a viable approach to combat the widespread problem of vitamin A deficiency among people for whom maize is a staple food. To enhance CIMMYT's provitamin A maize breeding efforts, this study: 1) evaluated whether separation of experimental maize lines into groups based on maximizing their molecular-marker-based genetic distances (GD) resulted in heterosis for among-group crosses, 2) assessed genetic effects (general and specific combining ability, GCA and SCA) for grain yield and provitamin A concentrations in hybrids among 21 inbred lines representing the three proposed groups, and 3) assessed the association between grain yield and provitamin A concentrations. The lines were crossed following a partial diallel design resulting in 156 hybrids which were evaluated at four environments with two replications of one-row plots. The first plant in each plot was self-pollinated to produce grain for provitamin A analysis. Significant but small yield advantage of among versus within group crosses (0.47 Mg ha-1 21 , P<0.05) suggested that the groups identified by maximizing GD could be a practicalstarting point for further breeding work to develop useful heterotic groups. Furthermore, the GD-proposed heterotic groups were improved by later revising some line assignments to groups using estimates of SCA effects. GCA effects were significant (P<0.01) for all traits, whereas SCA effects were weak (P<0.05) or not significant for provitamin A carotenoid concentrations, indicating that these were controlled primarily by additive gene action. Grain yield was not significantly correlated with provitamin A
dc.descriptionconcentration, indicating that both traits could be improved simultaneously.
dc.description14-24
dc.formatPDF
dc.languageEnglish
dc.publisherCrop Science Society of America (CSSA)
dc.publisherhttps://www.crops.org/publications/cs/pdfs/54/1/14
dc.rightsCIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
dc.rightsOpen Access
dc.source1
dc.source54
dc.sourceCrop Science
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectMAIZE
dc.subjectPROVITAMINS
dc.subjectFOOD FORTIFICATION
dc.subjectGENE EXPRESSION REGULATION
dc.titleFormation of heterotic groups and understanding genetic effects in a provitamin a biofortified maize breeding program
dc.typeArticle


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