Robust simple sequence repeat markers for spruce (Picea spp.) from expressed sequence tags (original) (raw)

Abstract

Traditionally, simple sequence repeat (SSR) markers have been developed from libraries of genomic DNA. However, the large, repetitive nature of conifer genomes makes development of robust, single-copy SSR markers from genomic DNA difficult. Expressed sequence tags (ESTs), or sequences of messenger RNA, offer the opportunity to exploit single, low-copy, conserved sequence motifs for SSR development. From a 20,275-unigene spruce EST set, we identified 44 candidate EST-SSR markers. Of these, 25 amplified and were polymorphic in white, Sitka, and black spruce; 20 amplified in all 23 spruce species tested; the remaining five amplified in all except one species. In addition, 101 previously described spruce SSRs (mostly developed from genomic DNA), were tested. Of these, 17 amplified across white, Sitka, and black spruce. The 25 EST-SSRs had approximately 9% less heterozygosity than the 17 genomic-derived SSRs (mean _H_=0.65 vs 0.72), but appeared to have less null alleles, as evidenced by much lower apparent inbreeding (mean _F_=0.046 vs 0.126). These robust SSRs are of particular use in comparative studies, and as the EST-SSRs are within the expressed portion of the genome, they are more likely to be associated with a particular gene of interest, improving their utility for quantitative trait loci mapping and allowing detection of selective sweeps at specific genes.

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Acknowledgements

Genome Canada and the Province of British Columbia, through the Genome BC Forestry Genome Project, funded this research. We acknowledge the support of the Vancouver Genome Sciences Centre for EST sequencing and database development. We thank Dr. Sally Aitken (University of British Columbia) for the white spruce collections, Washington Gapare (University of British Columbia) for the Sitka spruce collections, and Dr. Om Rajora (Dalhousie University) for the black spruce collections. Dr. Barry Jaquish of the B.C. Ministry of Forests Kalamalka research station provided the spruce species collection.

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Authors and Affiliations

  1. Department of Forest Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
    Dainis Rungis, Yanik Bérubé, Jun Zhang, Steven Ralph, Carol E. Ritland, Jörg Bohlmann & Kermit Ritland
  2. Department of Botany, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
    Brian E. Ellis, Carl Douglas & Jörg Bohlmann
  3. Biotechnology Laboratory, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
    Brian E. Ellis & Jörg Bohlmann

Authors

  1. Dainis Rungis
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  2. Yanik Bérubé
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  3. Jun Zhang
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  4. Steven Ralph
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  5. Carol E. Ritland
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  6. Brian E. Ellis
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  7. Carl Douglas
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  8. Jörg Bohlmann
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  9. Kermit Ritland
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Corresponding author

Correspondence toKermit Ritland.

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Communicated by O. Savolainen

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Rungis, D., Bérubé, Y., Zhang, J. et al. Robust simple sequence repeat markers for spruce (Picea spp.) from expressed sequence tags.Theor Appl Genet 109, 1283–1294 (2004). https://doi.org/10.1007/s00122-004-1742-5

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