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- W4321499605 abstract "Acidity is a key determinant of fruit organoleptic quality. Here, a candidate gene for fruit acidity, designated MdMYB123, was identified from a comparative transcriptome study of two Ma1Ma1 apple (Malus domestica) varieties, Qinguan (QG) and Honeycrisp (HC) with different malic acid content. Sequence analysis identified an A→T SNP, which was located in the last exon, resulting in a truncating mutation, designated mdmyb123. This SNP was significantly associated with fruit malic acid content, accounting for 9.5% of the observed phenotypic variation in apple germplasm. Differential MdMYB123- and mdmyb123-mediated regulation of malic acid accumulation was observed in transgenic apple calli, fruits, and plantlets. Two genes, MdMa1 and MdMa11, were up- and down-regulated in transgenic apple plantlets overexpressing MdMYB123 and mdmyb123, respectively. MdMYB123 could directly bind to the promoter of MdMa1 and MdMa11, and induce their expression. In contrast, mdmyb123 could directly bind to the promoters of MdMa1 and MdMa11, but with no transcriptional activation of both genes. In addition, gene expression analysis in 20 different apple genotypes based on SNP locus from QG × HC hybrid population confirmed a correlation between A/T SNP with expression levels of MdMa1 and MdMa11. Our finding provides valuable functional validation of MdMYB123 and its role in the transcriptional regulation of both MdMa1 and MdMa11, and apple fruit malic acid accumulation." @default.
- W4321499605 created "2023-02-23" @default.
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- W4321499605 date "2023-02-22" @default.
- W4321499605 modified "2023-10-16" @default.
- W4321499605 title "Allelic variation of <i>MdMYB123</i> controls malic acid content by regulating <i>MdMa1</i> and <i>MdMa11</i> expression in apple" @default.
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- W4321499605 doi "https://doi.org/10.1093/plphys/kiad111" @default.
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