Combining ability of extra-early maize inbreds derived from a cross between maize and Zea diploperennis and hybrid performance under contrasting environments

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dc.creatorAmegbor, I.K.
dc.creatorBadu-Apraku, Baffour
dc.creatorAdu, G.B.
dc.creatorAdjebeng-Danquah, J.
dc.creatorToyinbo, J.O.
dc.date2020-07-24
dc.date2020-09-07T10:58:42Z
dc.date2020-09-07T10:58:42Z
dc.date.accessioned2026-06-27T15:50:19Z
dc.descriptionKnowledge of the genetic mechanisms conditioning drought tolerance in maize is crucial to the success of hybrid breeding programs aimed at developing high-yielding cultivars under drought. The objectives of this study were to determine the combining ability of extra-early inbreds, compute the heritability of measured traits, assess the performance of inbreds in hybrid combinations and investigate the associations among traits under drought and optimal conditions. A total of 252 hybrids generated by crossing 63 inbreds to four testers, along with four commercial hybrid checks, were evaluated for 2 years under drought and rainfed conditions. General combining ability (GCA) and specific combining ability (SCA) for the traits were significant. A total of 57.1% and 53.4% of the genotypic sum of squares were attributable to GCA effects for grain yield under managed drought and rainfed conditions, respectively. Hybrids TZdEEI 91 × TZEEI 21 and TZdEEI 55 × TZEEI 13 out-yielded the best checks under drought and optimal conditions by 49.13% and 39.05%, respectively. The most promising hybrids with consistently high grain yield under drought and rainfed conditions, were TZdEEI 54 × TZEEI 13, TZdEEI 91 × TZEEI 21 and TZdEEI 55 × TZEEI 21 and should be further evaluated for possible commercial production in sub-Saharan Africa.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/109244
dc.identifier.urihttp://hdl.handle.net/123456789/114958
dc.languageen
dc.publisherMDPI
dc.rightsOpen Access
dc.sourceAmegbor, I.K., Badu-Apraku, B., Adu, G.B., Adjebeng-Danquah, J. & Toyinbo, J.O. (2020). Combining ability of extra-early maize inbreds derived from a cross between maize and Zea diploperennis and hybrid performance under contrasting environments. Agronomy, 10(8): 1069, 2020. 1-18.
dc.subjectcombining ability
dc.subjectheritability
dc.subjectzea diploperennis
dc.subjectzea mays
dc.subjectvariants
dc.subjectdrought tolerance
dc.subjectinbred lines
dc.titleCombining ability of extra-early maize inbreds derived from a cross between maize and Zea diploperennis and hybrid performance under contrasting environments
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)