Genome-Wide Association Study Reveals Genetic Architecture and Candidate Genes for Yield and Related Traits under Terminal Drought, Combined Heat and Drought in Tropical Maize Germplasm

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dc.contributor.authorOsuman, A.S.
dc.contributor.authorBadu-Apraku, B.
dc.contributor.authorKarikari, B.
dc.contributor.authorIfie, B.E.
dc.contributor.authorTongoona, P.
dc.contributor.authorDanquah, E.Y.
dc.date.accessioned2022-04-27T09:19:15Z
dc.date.available2022-04-27T09:19:15Z
dc.date.issued2022
dc.descriptionResearch Articleen_US
dc.description.abstractMaize (Zea mays L.) production is constrained by drought and heat stresses. The combination of these two stresses is likely to be more detrimental. To breed for maize cultivars tolerant of these stresses, 162 tropical maize inbred lines were evaluated under combined heat and drought (CHD) and terminal drought (TD) conditions. The mixed linear model was employed for the genome-wide association study using 7834 SNP markers and several phenotypic data including, days to 50% anthesis (AD) and silking (SD), husk cover (HUSKC), and grain yield (GY). In total, 66, 27, and 24 SNPs were associated with the traits evaluated under CHD, TD, and their combined effects, respectively. Of these, four single nucleotide polymorphism (SNP) markers (SNP_161703060 on Chr01, SNP_196800695 on Chr02, SNP_195454836 on Chr05, and SNP_51772182 on Chr07) had pleiotropic effects on both AD and SD under CHD conditions. Four SNPs (SNP_138825271 (Chr03), SNP_244895453 (Chr04), SNP_168561609 (Chr05), and SNP_62970998 (Chr06)) were associated with AD, SD, and HUSKC under TD. Twelve candidate genes containing phytohormone cis-acting regulating elements were implicated in the regulation of plant responses to multiple stress conditions including heat and drought. The SNPs and candidate genes identified in the study will provide invaluable information for breeding climate smart maize varieties under tropical conditions following validation of the SNP markers.en_US
dc.identifier.otherhttps://doi.org/10.3390/genes13020349
dc.identifier.urihttp://ugspace.ug.edu.gh/handle/123456789/37977
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.subjectcandidate genesen_US
dc.subjectclimate smarten_US
dc.subjectgenomicsen_US
dc.subjectmarker-assisted selectionen_US
dc.subjectsub-Saharan Africaen_US
dc.titleGenome-Wide Association Study Reveals Genetic Architecture and Candidate Genes for Yield and Related Traits under Terminal Drought, Combined Heat and Drought in Tropical Maize Germplasmen_US
dc.typeArticleen_US

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