Genetic architecture of maize chlorotic mottle virus and maize lethal necrosis through GWAS, linkage analysis and genomic prediction in tropical maize germplasm.

摘要: Analysis of the genetic architecture MCMV and MLN resistance in maize doubled-haploid populations revealed QTLs with major effects on chromosomes 3 6 that were consistent across backgrounds environments. Two major-effect QTLs, qMCMV3-108/qMLN3-108 qMCMV6-17/qMLN6-17, identified as conferring to both MLN. Maize lethal necrosis (MLN) is a serious threat food security maize-growing smallholders sub-Saharan Africa. The ability chlorotic mottle virus (MCMV) interact other members Potyviridae causes severe yield losses form objective present study was gain insights validate maize. We applied linkage mapping three genome-wide association (GWAS) 380 diverse lines. For all populations, phenotypic variation for significant, heritability moderate high. Linkage 13 quantitative trait loci (QTLs) 12 resistance. One QTL, qMCMV3-108/qMLN3-108, Joint (JLAM) 18 21 main-effect resistance, respectively. Another detected GWAS total 54 SNPs (MCMV-13 MLN-41) significantly associated (P ≤ 5.60 × 10−05) Most GWAS-identified within or adjacent through mapping. prediction accuracy well combined promising; however, low populations. Overall, controlled by few many minor-effect seems more complex than