Meiho University Institutional Repository:Item 987654321/2881
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    题名: RNA-Seq SSRs of Moth Orchid and Screeningfor Molecular Markers across GenusPhalaenopsis (Orchidaceae)
    作者: Tsai, Chi-Chu;Shih, Huei-Chuan;Wang4☯, Hao-Ven;Lin, Yu-Shium;Chang, Chia-Hung;Chiang, Yu-Chung;Chou, Chang-Hung
    日期: 2015-11-12
    上传时间: 2015-11-12T07:23:57Z (UTC)
    摘要: Background
    The moth orchid (Phalaenopsis species) is an ornamental crop that is highly commercialized
    worldwide. Over 30,000 cultivars of moth orchids have been registered at the Royal
    Horticultural Society (RHS). These cultivars were obtained by artificial pollination of interspecific
    hybridization. Therefore, the identification of different cultivars is highly important in
    the worldwide market.
    Methods/Results
    We used Illumina sequencing technology to analyze an important species for breeding,
    Phalaenopsis aphrodite subsp. formosana and develop the expressed sequence tag (EST)-
    simple sequence repeat (SSR) markers. After de novo assembly, the obtained sequence
    covered 29.1 Mb, approximately 2.2% of the P. aphrodite subsp. formosana genome (1,300
    Mb), and a total of 1,439 EST-SSR loci were detected. SSR occurs in the exon region,
    including the 5’ untranslated region (UTR), coding region (CDS), and 3’UTR, on average
    every 20.22 kb. The di- and tri-nucleotide motifs (51.49% and 35.23%, respectively) were
    the two most frequent motifs in the P. aphrodite subsp. formosana. To validate the developed
    EST-SSR loci and to evaluate the transferability to the genus Phalaenopsis, thirty trinucleotide
    motifs of the EST-SSR loci were randomly selected to design EST-SSR primers
    and to evaluate the polymorphism and transferability across 22 native Phalaenopsis species
    that are usually used as parents for moth orchid breeding. Of the 30 EST-SSR loci, ten polymorphic
    and transferable SSR loci across the 22 native taxa can be obtained. The validated
    EST-SSR markers were further proven to discriminate 12 closely related Phalaenopsis cultivars.
    The results show that it is not difficult to obtain universal SSR markers by transcriptome
    deep sequencing in Phalaenopsis species.
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