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IJB-Iranian Journal of Biotechnology. 2012; 10 (3): 153-160
in English | IMEMR | ID: emr-137834

ABSTRACT

MdMYB10 gene expression results in accumulation of anthocyanin in many tissues including flesh of apple fruit. The MdMYB1 and MdMYBA genes are close homologues to MdMYB10 gene and both are responsible for red color phenotype in apple fruit skin. In the current study, an apple genome sequence draft analysis indicated that these three genes are located in a unique contig. Further analysis suggested that these homologues are alleles of a single locus and they differ in a repeated sequence of the promoter region. This repeated sequence ensures high expression level of MdMYB10 in most of the plant tissues while MdMYB1 and MdMYBA alleles lack such a repeated sequence in their promoters and their expression is confined to the fruit skin. Also, we suggest a tissueand genome-specific expression pattern for these three alleles considering our data and other recent publications. No variation was detected in the sequence or in the number of repeats of MdMYB10 promoter in Iranian red flesh apple geo-variants, pointing that the number of repeat is not related to flesh color intensity or variation, and the repeat elements have occurred once during the evolution

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