Phenotypic assessment of genetic gain from selection for improved drought tolerance in semi-tropical maize populations

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cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationIowa State Universityen
cg.contributor.affiliationInternational Maize and Wheat Improvement Centeren
cg.contributor.donorUnited States Department of Agricultureen
cg.contributor.donorCGIAR Trust Funden
cg.contributor.initiativeAccelerated Breeding
cg.creator.identifierTerence Molnar: 000-0002-0476-1945
cg.creator.identifierThanda Dhliwayo: 0000-0001-8583-129X
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1111/jac.12592en
cg.isijournalISI Journalen
cg.issn1439-037Xen
cg.issue1en
cg.journalJournal of Agronomy and Crop Scienceen
cg.reviewStatusPeer Reviewen
cg.subject.actionAreaGenetic Innovation
cg.subject.impactAreaNutrition, health and food security
cg.volume209en
dc.contributor.authorMusimwa, Tatenda R.en
dc.contributor.authorMolnar, Terence Lukeen
dc.contributor.authorDutta, Somaken
dc.contributor.authorDhliwayo, Thandaen
dc.contributor.authorTrachsel, Samuelen
dc.contributor.authorLee, Michaelen
dc.date.accessioned2023-01-04T08:00:35Zen
dc.date.available2023-01-04T08:00:35Zen
dc.identifier.urihttps://hdl.handle.net/10568/126526
dc.titlePhenotypic assessment of genetic gain from selection for improved drought tolerance in semi-tropical maize populationsen
dcterms.abstractMost maize production across the globe is rain-fed, and production is set to be negatively impacted as duration and occurrence of droughts increases due to climate change. Development of water-deficit tolerant maize germplasm has been a major focus for most breeding programmes. Here, we sought to assess the genetic gain for grain yield in two maize populations developed for drought tolerance at CIMMYT by evaluating their cycle progeny through hybrid performance. Inbreds derived from different cycles of the Drought Tolerant Population (DTP) and La Posta Sequia (LPS) were mated to a tester (CML550), and resulting hybrids were evaluated under managed water-deficit stress and well-watered conditions. The difference in yield between water-deficit and well-watered treatments was 27% and 36% for the DTP and LPS, respectively. Genetic gain for grain yield across cycles for the two populations was confirmed in the study. Genetic gain was observed for both treatments indicating that selection for water-deficit stress tolerance simultaneously improves grain yield in well-watered conditions. The DTP population had a genetic gain of 0.07 t ha−1 cycle−1, while the LPS had 0.16 t ha−1 cycle−1 under water-deficit conditions. Significant genetic gain was also observed in the well-watered treatments for both populations. Anthesis to silking interval was significantly reduced under water-deficit stress conditions in both populations. Plant and ear height were reduced in the LPS population in both treatments, while no reductions were observed for the trait in the DTP population. Potential water-deficit stress tolerance donor lines with yields comparable to commercial check varieties were identified.en
dcterms.accessRightsOpen Access
dcterms.audienceScientistsen
dcterms.available2022-04-19
dcterms.bibliographicCitationMusimwa, T. R., Molnar, T. L., Dutta, S., Dhliwayo, T., Trachsel, S., & Lee, M. (2022). Phenotypic assessment of genetic gain from selection for improved drought tolerance in semi‐tropical maize populations. Journal of Agronomy and Crop Science, 209(1), 71–82. Portico. https://doi.org/10.1111/jac.12592en
dcterms.extentpp. 71-82en
dcterms.issued2023-02
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherWileyen
dcterms.subjectdrought toleranceen
dcterms.subjectwateren
dcterms.subjectmaizeen
dcterms.subjectclimate changeen
dcterms.subjectgenetic gainen
dcterms.typeJournal Article

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