EST-derived SSR markers from defined regions of the wheat genome to identify Lophopyrum elongatum specific loci

D.J. Mullan, A. Platteter, Natasha Teakle, R. Appels, Tim Colmer, J.M. Anderson, M.G. Francki

    Research output: Contribution to journalArticle

    52 Citations (Scopus)

    Abstract

    Lophopyrum elongatitin, a close relative of wheat. provides a source of novel genes for wheat improvement. Molecular markers were developed to monitor the introgression of L. elongatum chromosome segments into hexaploid wheat. Existing simple sequence repeats (SSRs) derived from genomic libraries were initially screened for detecting L. elongotum loci in wheat, but only 6 of the 163 markers tested were successful. To increase detection of L. elongatum specific loci, 165 SSRs were identified from wheat expressed sequence taus (ESTs), where their chromosomal positions in wheat were known from deletion bin mapping. Detailed sequence analysis identified 41 SSRs within this group as potentially superior in their ability to detect L. elongation loci. BLASTN alignments were used to position primers within regions of the ESTs that have sequence conservation with at least I similar EST from another cereal species. The targeting of primers in this manner enabled 14 L. elongatum markers from 41 wheat ESTs to be identified, whereas only 2 from 124 primers designed in random positions flanking SSRs detected L. elongatum loci. Addition and ditelosomic lines were used to assign all 22 markers to specific chromosome locations in L. elongatitin. Nine of these SSR markers were assigned to hornoeologeous chromosome locations based on their similar position in hexaploid wheat. The remaining markers mapped to other L. elongatum chromosomes indicating a degree of chromosome rearrangements, paralogous sequences and (or) sequence variation between the 2 species. The EST-SSR markers were also used to screen other wheatgrass species indicating further chromosome rearrangements and (or) sequence variation between wheatgrass genomes. This study details methodologies for the generation of SSRs for detecting L. elongatum loci.
    Original languageEnglish
    Pages (from-to)811-822
    JournalGenome
    Volume48
    Issue number5
    DOIs
    Publication statusPublished - 2005

    Fingerprint

    Thinopyrum elongatum
    Microsatellite Repeats
    Triticum
    Genome
    microsatellite repeats
    loci
    wheat
    genome
    Chromosomes
    chromosomes
    hexaploidy
    Thinopyrum
    Genomic Library
    genomic libraries
    introgression
    Sequence Analysis
    sequence analysis
    genetic markers
    monitoring

    Cite this

    Mullan, D.J. ; Platteter, A. ; Teakle, Natasha ; Appels, R. ; Colmer, Tim ; Anderson, J.M. ; Francki, M.G. / EST-derived SSR markers from defined regions of the wheat genome to identify Lophopyrum elongatum specific loci. In: Genome. 2005 ; Vol. 48, No. 5. pp. 811-822.
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    abstract = "Lophopyrum elongatitin, a close relative of wheat. provides a source of novel genes for wheat improvement. Molecular markers were developed to monitor the introgression of L. elongatum chromosome segments into hexaploid wheat. Existing simple sequence repeats (SSRs) derived from genomic libraries were initially screened for detecting L. elongotum loci in wheat, but only 6 of the 163 markers tested were successful. To increase detection of L. elongatum specific loci, 165 SSRs were identified from wheat expressed sequence taus (ESTs), where their chromosomal positions in wheat were known from deletion bin mapping. Detailed sequence analysis identified 41 SSRs within this group as potentially superior in their ability to detect L. elongation loci. BLASTN alignments were used to position primers within regions of the ESTs that have sequence conservation with at least I similar EST from another cereal species. The targeting of primers in this manner enabled 14 L. elongatum markers from 41 wheat ESTs to be identified, whereas only 2 from 124 primers designed in random positions flanking SSRs detected L. elongatum loci. Addition and ditelosomic lines were used to assign all 22 markers to specific chromosome locations in L. elongatitin. Nine of these SSR markers were assigned to hornoeologeous chromosome locations based on their similar position in hexaploid wheat. The remaining markers mapped to other L. elongatum chromosomes indicating a degree of chromosome rearrangements, paralogous sequences and (or) sequence variation between the 2 species. The EST-SSR markers were also used to screen other wheatgrass species indicating further chromosome rearrangements and (or) sequence variation between wheatgrass genomes. This study details methodologies for the generation of SSRs for detecting L. elongatum loci.",
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    EST-derived SSR markers from defined regions of the wheat genome to identify Lophopyrum elongatum specific loci. / Mullan, D.J.; Platteter, A.; Teakle, Natasha; Appels, R.; Colmer, Tim; Anderson, J.M.; Francki, M.G.

    In: Genome, Vol. 48, No. 5, 2005, p. 811-822.

    Research output: Contribution to journalArticle

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    AU - Mullan, D.J.

    AU - Platteter, A.

    AU - Teakle, Natasha

    AU - Appels, R.

    AU - Colmer, Tim

    AU - Anderson, J.M.

    AU - Francki, M.G.

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    AB - Lophopyrum elongatitin, a close relative of wheat. provides a source of novel genes for wheat improvement. Molecular markers were developed to monitor the introgression of L. elongatum chromosome segments into hexaploid wheat. Existing simple sequence repeats (SSRs) derived from genomic libraries were initially screened for detecting L. elongotum loci in wheat, but only 6 of the 163 markers tested were successful. To increase detection of L. elongatum specific loci, 165 SSRs were identified from wheat expressed sequence taus (ESTs), where their chromosomal positions in wheat were known from deletion bin mapping. Detailed sequence analysis identified 41 SSRs within this group as potentially superior in their ability to detect L. elongation loci. BLASTN alignments were used to position primers within regions of the ESTs that have sequence conservation with at least I similar EST from another cereal species. The targeting of primers in this manner enabled 14 L. elongatum markers from 41 wheat ESTs to be identified, whereas only 2 from 124 primers designed in random positions flanking SSRs detected L. elongatum loci. Addition and ditelosomic lines were used to assign all 22 markers to specific chromosome locations in L. elongatitin. Nine of these SSR markers were assigned to hornoeologeous chromosome locations based on their similar position in hexaploid wheat. The remaining markers mapped to other L. elongatum chromosomes indicating a degree of chromosome rearrangements, paralogous sequences and (or) sequence variation between the 2 species. The EST-SSR markers were also used to screen other wheatgrass species indicating further chromosome rearrangements and (or) sequence variation between wheatgrass genomes. This study details methodologies for the generation of SSRs for detecting L. elongatum loci.

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