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http://dx.doi.org/10.5352/JLS.2008.18.2.234

A Set of Anthocyanin Biosynthetic Genes are Differentially Expressed in Strawberry (Fragaria x ananassa cv Maehyang) during the Fruit Development Process  

Bae, Ki-Suk (Department of Molecular Biology, Dankook University, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Kih, Joon-Yeong (Department of Molecular Biology, Dankook University, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Pyee, Jae-Ho (Department of Molecular Biology, Dankook University, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Publication Information
Journal of Life Science / v.18, no.2, 2008 , pp. 234-240 More about this Journal
Abstract
Anthocyanin synthesis in strawberry (Fragaria x ananassa cv Maehyang) begins approximately 26 days postflowering and continued throughout fruit ripening. A set of cDNA clones encoding the anthocyanin biosynthetic enzymes were isolated from strawberry. A pair of primers were designed for polymerase chain reaction (PCR) through the comparison of the nucleotide sequences of homologous genes from diverse plants. Reverse transcriptase-PCRs were performed using cDNA synthesized from ripe fruit total RNA and the primers corresponding to each gene. Eight genes of the anthocyanin pathway were cloned and confirmed by sequencing to code for phenylalanine ammonia lyase (PAL), 4-cummarate CoA ligase (4CL), chalcone synthase (CHS), chalcone isomerase (CHI), flavanone-3-hydroxylase (F3H), dihydroflavonol 4-reductase (DFR), anthocyanidine synthase (ANS), UDP-glucose:flavonoid-3-O-glucosyl-transferase (UFGT). Northern analyses showed that the corresponding genes were differentially expressed during the fruit development process. All genes except PAL were predominantly expressed in fruit. Expression of PAL, DFR and ANS was detected 10 days postflowering at the early stage of fruit development, declined for a while and sharply increased 22 days postflowering then showed a peak 34 days postflowering. The other genes, however, were not expressed up to 22 or 30 days postflowering when the initial fruit ripening events occur at the time of initiation of anthocyanin accumulation. The onset of anthocyanin synthesis in ripening strawberry coincides with a coordinated induction of the anthocyanin pathway genes, suggesting the involvement of regulatory genes. We propose that at least two different regulatory mechanisms playa role in the biosynthesis of anthocyanin during color development of strawberry.
Keywords
Maehyang strawberry; anthocyanin biosynthetic genes; fruit development; regulation of gene expression;
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