Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions

dc.creatorJulius Pyton Sserumaga
dc.creatorBeyene, Y.
dc.creatorPillay, K.
dc.creatorAlois Kullaya
dc.creatorOikeh, S.O.
dc.creatorMugo, S.N.
dc.creatorMachida, L.
dc.creatorIsmail Ngolinda
dc.creatorAsea, G.
dc.creatorJustin Ringo
dc.creatorOtim, M.
dc.creatorAbalo, G.
dc.creatorBarnabas Kiula
dc.date2019-01-17T16:05:36Z
dc.date2019-01-17T16:05:36Z
dc.date2018
dc.date.accessioned2023-07-17T20:03:24Z
dc.date.available2023-07-17T20:03:24Z
dc.identifier1836-5795
dc.identifierISSN: 1836-0947
dc.identifierESSN: 1836-5795
dc.identifierhttps://hdl.handle.net/10883/19794
dc.identifier10.1071/CP17348
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7511667
dc.descriptionDrought is a devastating environmental stress in agriculture and hence a common target of plant breeding. A review of breeding progress on drought tolerance shows that, to a certain extent, selection for high yield in stress-free conditions indirectly improves yield in water-limiting conditions. The objectives of this study were to (i) assess the genotype × environment (GE) interaction for grain yield (GY) and other agronomic traits for maize (Zea mays L.) across East African agro-ecologies; and (ii) evaluate agronomic performance and stability in Uganda and Tanzania under optimum and random drought conditions. Data were recorded for major agronomic traits. Genotype main effect plus GE (GGE) biplot analysis was used to assess the stability of varieties within various environments and across environments. Combined analysis of variance across optimum moisture and random drought environments indicated that locations, mean-squares for genotypes and GE were significant for most measured traits. The best hybrids, CKDHH1097 and CKDHH1090, gave GY advantages of 23% and 43%, respectively, over the commercial hybrid varieties under both optimum-moisture and random-drought conditions. Across environments, genotypic variance was less than the GE variance for GY. The hybrids derived from doubled-haploid inbred lines produced higher GY and possessed acceptable agronomic traits compared with the commercial hybrids. Hybrid CKDHH1098 ranked second-best under optimum-moisture and drought-stress environments and was the most stable with broad adaptation to both environments. Use of the best doubled-haploids lines in testcross hybrids make-up, well targeted to the production environments, could boost maize production among farmers in East Africa.
dc.description691-702
dc.formatPDF
dc.languageEnglish
dc.publisherCSIRO
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dc.rightsOpen Access
dc.source7
dc.source69
dc.sourceCrop and Pasture Science
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectCorrelation
dc.subjectG-E Interaction
dc.subjectGENOTYPE ENVIRONMENT INTERACTION
dc.subjectDROUGHT
dc.subjectSTATISTICAL METHODS
dc.subjectHERITABILITY
dc.subjectMANAGEMENT
dc.titleGrain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions
dc.typeArticle
dc.coverageAustralia


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