Performance and adaptability of doubled haploid maize testcross hybrids under drought stress and non-stress conditions

dc.creatorOdiyo, O.
dc.creatorNjoroge, K.
dc.creatorChemining’wa, G.N.
dc.creatorBeyene, Y.
dc.date2021-04-20T17:14:34Z
dc.date2021-04-20T17:14:34Z
dc.date2014
dc.date.accessioned2023-07-17T20:07:32Z
dc.date.available2023-07-17T20:07:32Z
dc.identifierhttps://hdl.handle.net/10883/21450
dc.identifier10.14303/irjas.2014.055
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7513231
dc.descriptionHaploid breeding via in vivo induction of maternal haploids is rapidly replacing the pedigree breeding methods since it reduces the breeding cycle from at least 6 to 1-2 generations to reach a homozygous state. Eighty doubled haploid (DH) lines derived from nine tropical maize backcross populations were crossed to two CIMMYT single cross testers (CML312/CML442 and CML395/CML444) in a North Carolina II mating design. The resultant 160 DH testcross hybrids and five commercial checks were evaluated across four well-watered locations and two drought stressed locations in Kenya using an alpha-lattice design of 15 x 11 replicated twice. Significant differences (0.05 < p < 0.001) were observed in location, genotype and genotype by environment interaction for grain yield, days to anthesis, anthesis-silking interval and ear aspect under non-stress conditions. Combined analyses across drought stress and well-watered environments showed that the top 20 hybrids performed better for grain yield and other agronomic traits of maize compared to the commercial checks. Grain yield for the top 20 DH hybrids ranged from 8.15-8.85 t/ha under optimum management and 4.53-5.67 t/ha under drought stress conditions while the best commercial variety yielded 7.67 t/ha and 3.43 t/ha under optimum and drought stress conditions, respectively. The top ten DH testcross hybrids averaged over the four optimum locations yielded 16% higher than the best commercial check while under managed drought the top ten DH hybrids produced 62% higher grain yield than the best commercial check. Three DH testcross hybrids entries 23, 28 and 71 performed highly for grain yield under both stress and non-stress locations high stress tolerance indices (STI) and low stress susceptibility indices (SSI). These results indicated that maize hybrids developed from DH lines produced as high a grain yield and as acceptable agro­nomic traits as the commercial hybrids developed through conventional pedigree methods. The DH lines identified in the study should be useful in improving grain yields and in the drought prone mid-altitude areas of eastern and southern Africa.
dc.description150-158
dc.languageEnglish
dc.publisherInternational Research Journals
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.source8
dc.source4
dc.source2251-0044
dc.sourceInternational Research Journal of Agricultural Science and Soil Science
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectDoubled Haploid
dc.subjectGrain Yield
dc.subjectMAIZE
dc.subjectHAPLOIDY
dc.subjectDROUGHT
dc.subjectGRAIN
dc.subjectYIELDS
dc.subjectABIOTIC STRESS
dc.subjectDROUGHT STRESS
dc.titlePerformance and adaptability of doubled haploid maize testcross hybrids under drought stress and non-stress conditions
dc.typeArticle
dc.typePublished Version
dc.coverageNigeria


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