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• W2808293313 abstract "Large-scale application of the doubled haploid (DH) technology by in vivo haploid induction has greatly improved the efficiency of maize breeding. While the haploid induction rate and the efficiency of identifying haploid plants have greatly improved in recent years, the low efficiency of doubling of haploid plants has remained and currently presents the main limitation to maize DH breeding. In this study, we aimed to assess the available genetic variation for haploid male fertility, i.e. the production of fertile pollen on haploid plants, and to investigate the underlying genetic architecture. To this end, a diversity panel of 481 maize inbred lines was crossed with ‘Mo17’ and ‘Zheng58’, the F1 hybrids subjected to haploid induction, and resulting haploid plants assessed for male fertility in two environments. Across both genetic backgrounds, we observed a large variation of haploid male fertility ranging from zero to ~60 %, with a mean of 18 %, and a heritability of 0.65. Haploid male fertility was higher in the ‘Mo17’ than in the ‘Zheng58’ background and the correlation between both genetic backgrounds was 0.68. Genome-wide association mapping identified only few putative QTL that jointly explained 22.5 % of the phenotypic variance. With the exception of one association explaining 11.77 % of the phenotypic variance, all other putative QTL were of minor importance. A genome-wide prediction approach further corroborated the quantitative nature of haploid male fertility in maize. Analysis of the 14 significantly associated SNPs revealed several candidate genes, some known to be involved in endopeptidase encode, transporter activate or sexual reproduction. Collectively, our results illustrate the large variation of haploid male fertility that can be exploited for maize DH breeding. Owing to the apparent genetic complexity of this trait, this might best be achieved by rapid recurrent phenotypic selection coupled with marker-assisted selection for individual QTL." @default.
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• W2808293313 date "2018-07-17" @default.
• W2808293313 modified "2023-10-04" @default.
• W2808293313 title "Genome-Wide Association Study of Haploid Male Fertility in Maize (Zea Mays L.)" @default.
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• W2808293313 doi "https://doi.org/10.3389/fpls.2018.00974" @default.
• W2808293313 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6057118" @default.
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