Combining ability and testcross performance of drought-tolerant maize inbred lines under stress and non-stress environments in Kenya

dc.creatorTadesse, B.
dc.creatorBeyene, Y.
dc.creatorDas, B.
dc.creatorMugo, S.N.
dc.creatorOlsen, M.
dc.creatorOikeh, S.O.
dc.creatorJuma, C.
dc.creatorLabuschagne, M.
dc.creatorPrasanna, B.M.
dc.date2017-08-23T15:41:24Z
dc.date2017-08-23T15:41:24Z
dc.date2017
dc.date.accessioned2023-07-17T20:01:35Z
dc.date.available2023-07-17T20:01:35Z
dc.identifierhttp://hdl.handle.net/10883/18875
dc.identifier10.1111/pbr.12464
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7510936
dc.descriptionDrought and poor soil fertility are among the major abiotic stresses affecting maize productivity in sub-Saharan Africa. Maize breeding efforts at the International Maize and Wheat Improvement Center (CIMMYT) have focused on incorporating drought stress tolerance and nitrogen-use efficiency (NUE) into tropical maize germplasm. The objectives of this study were to estimate the general combining ability (GCA) and specific combining ability (SCA) of selected maize inbred lines under drought stress (DS), low-nitrogen (LN) and optimum moisture and nitrogen (optimum) conditions, and to assess the yield potential and stability of experimental hybrids under these management conditions. Forty-nine experimental three-way cross hybrids, generated from a 7 × 7 line by tester crosses, and six commercial checks were evaluated across 11 optimum, DS and LN sites in Kenya in 2014 using an alpha lattice design with two replicates per entry at each site. DS reduced both grain yield (GY) and plant height (PH), while anthesis–silking interval (ASI) increased under both DS and LN. Hybrids ‘L4/T2’ and ‘L4/T1’ were found to be superior and stable, while inbreds ‘L4’ and ‘L6’ were good combiners for GY and other secondary traits across sites. Additive variance played a greater role for most traits under the three management conditions, suggesting that further progress in the improvement of these traits should be possible. GY under optimum conditions was positively correlated with GY under both DS and LN conditions, but GY under DS and LN was not correlated. Our results suggest the feasibility for simultaneous improvement in grain yield performance of genotypes under optimum, DS and LN conditions.
dc.descriptionpages 197-205
dc.formatPDF
dc.languageEnglish
dc.publisherBlackwell Verlag
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.source2
dc.sourcev. 136
dc.sourcePlant Breeding
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectVariance
dc.subjectNitrogen Use Efficiency
dc.subjectDROUGHT TOLERANCE
dc.subjectNITROGEN
dc.subjectNUTRIENT USE EFFICIENCY
dc.subjectHERITABILITY
dc.subjectSTABILITY
dc.titleCombining ability and testcross performance of drought-tolerant maize inbred lines under stress and non-stress environments in Kenya
dc.typeArticle
dc.coverageSUB SAHARAN AFRICA
dc.coverageBerlin, Germany


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