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Combined linkage and association mapping identifies a major QTL (qRtsc8-1), conferring tar spot complex resistance in maize

dc.contributor.authorMahuku, George S.
dc.contributor.authorChen, J.
dc.contributor.authorShrestha, R.
dc.contributor.authorNarro, L.A.
dc.contributor.authorGuerrero, K.V.
dc.contributor.authorArcos, A.L.
dc.contributor.authorXu, Y.
dc.date.accessioned2019-12-04T10:57:51Z
dc.date.available2019-12-04T10:57:51Z
dc.date.issued2016-06
dc.identifier.citationMahuku, G., Chen, J., Shrestha, R., Narro, L.A., Guerrero, K.V.O., Arcos, A.L., & Xu, Y. (2016). Combined linkage and association mapping identifies a major QTL (qRtsc8-1), conferring tar spot complex resistance in maize. Theoretical and Applied Genetics, 129(6), 1217–1229.
dc.identifier.issn0040-5752
dc.identifier.urihttps://hdl.handle.net/20.500.12478/853
dc.description.abstractTar spot complex (TSC) is a highly destructive disease of maize found in some countries in America. Identification of TSC resistant germplasm and elucidating the genetic mechanism of resistance is crucial for the use of host resistance to manage this disease. We evaluated 890 elite maize inbred lines in multiple environments and used genome wide association analysis (GWAS) with genotypic data from Illumina MaizeSNP50 BeadChip containing 56 K SNPs to dissect the genetics of TSC resistance. GWAS results were validated through linkage analysis in three bi-parental populations derived from different resistant and susceptible parents. Through GWAS, three TSC resistance loci were identified on chromosome 2, 7 and 8 (−log10 (p) > 5.99). A major quantitative resistance locus (QTL) designated qRtsc8-1, was detected on maize chromosome bin 8.03. qRtsc8-1, was confirmed in three independent bi-parental populations and it accounted for 18–43 % of the observed phenotypic variation for TSC. A rare haplotype within the qRtsc8-1 region, occurring at a frequency of 3.5 % increased TSC resistance by 14 %. Candidate gene analysis revealed that a leucine-rich repeat receptor-like protein (LRR-RLKs) gene family maybe the candidate gene for qRtsc8-1. Identification and localization of a major locus conditioning TSC resistance provides the foundation for fine mapping qRtsc8-1 and developing functional markers for improving TSC resistance in maize breeding programs. To the best of our knowledge, this is the first report of a major QTL for TSC resistance.
dc.format.extent1217–1229
dc.language.isoen
dc.subjectField Trials
dc.subjectMonographella
dc.subjectConiothyrium
dc.subjectPhyllachorales
dc.subjectMaize
dc.titleCombined linkage and association mapping identifies a major QTL (qRtsc8-1), conferring tar spot complex resistance in maize
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpMaize
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationInternational Maize and Wheat Improvement Center
cg.contributor.affiliationHenan Agricultural University
cg.contributor.affiliationInstitute of Crop Science
cg.contributor.affiliationChinese Academy of Agricultural Sciences
cg.coverage.countryAmerican Samoa
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectMaize
cg.journalTheoretical and Applied Genetics
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid75225
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1007/s00122-016-2698-y


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