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- W2002163810 abstract "Three genes encoding granule-bound starch synthase (wx-TmA, wx-TsB, and wx-TtD) have been isolated from Triticum monococcum (AA), and Triticum speltoides (BB), by the polymerase chain reaction (PCR) approach, and from Triticum tauschii (DD), by screening a genomic DNA library. Multiple sequence alignment indicated that the wx-TmA, wx-TsB, and wx-TtD genes had the same extron and (or) intron structure as the previously reported waxy gene from barley. The lengths of the three wx-TmA, wx-TsB, and wx-TtD genes were 2834 bp, 2826 bp, and 2893 bp, respectively, each covering 31 bp in the untranslated leader and the entire coding region consisting of 11 exons and 10 introns. The three genes had identical lengths of exons, except exon1, and shared over 95% identity with each other within the exon regions. The majority of introns were significantly variable in length and sequence, differing mainly in length (1-57 bp) as a result of insertion and (or) deletion events. The deduced amino acid sequence from these three genes indicated that the mature WX-TMA, -TSB, and -TTD proteins contained the same number of amino acids, but differed in predicted molecular weight and isoelectric point (pI) due to amino acid substitutions (13-18). The predicted physical characteristics of the WX proteins matched the respective proteins in wheat very closely, but the match was not perfect. Furthermore the exon5 sequences of the wx-TmA, wx-TsB, and wx-TtD genes were different from a cDNA encoding a waxy gene of common wheat previously reported. The striking difference was that an insertion of 11 amino acids occurred in the cDNA sequence that could not be observed in the exons of the A, B, and D genes. It was noted, however, that the 3prime end of intron4 of these genes could account for the additional 11 amino acids. The sequence information from the available waxy genes identified the intron4-exon5-intron5 region as being diagnostic for sequence variation in waxy. The sequence variation in the waxy genes provides the basis for primer design to distinguish the respective genes in common wheat, and its progenitors, using PCR. Key words: Angiosperms, Poaceae, Triticeae, Triticum monococcum, Triticium speltoides, Triticum tauschii, granule-bound starch synthase, polymerase chain reaction (PCR), molecular evolution." @default.
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- W2002163810 date "2000-03-15" @default.
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- W2002163810 title "The genes encoding granule-bound starch synthases at the <i>waxy</i> loci of the A, B, and D progenitors of common wheat" @default.
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- W2002163810 doi "https://doi.org/10.1139/g99-117" @default.
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