Using diversity of the chloroplast genome to examine evolutionary history of wheat species

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• 作者：Fiona J. Leigh (1)
  Ian Mackay (1)
  Hugo R. Oliveira (2) (3)
  Nicholas E. Gosman (1)
  Richard A. Horsnell (1)
  Huw Jones (1)
  Jon White (1) (4)
  Wayne Powell (1) (5)
  Terence A. Brown (6)
  
• 关键词：Chloroplast SSRs ; cpSSRs ; Genetic diversity ; Polyploid wheat ; Wheat ; Wheat evolution
• 刊名：Genetic Resources and Crop Evolution
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：60
• 期：6
• 页码：1831-1842
• 全文大小：527KB
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• 作者单位：Fiona J. Leigh (1)
  Ian Mackay (1)
  Hugo R. Oliveira (2) (3)
  Nicholas E. Gosman (1)
  Richard A. Horsnell (1)
  Huw Jones (1)
  Jon White (1) (4)
  Wayne Powell (1) (5)
  Terence A. Brown (6)
  
  1. John Bingham Laboratory, National Institute of Agricultural Botany, Huntingdon Road, Cambridge, CB3 0LE, UK
  2. Department of Archaeology, University of Cambridge, Downing Street, Cambridge, CB2 3DZ, UK
  3. IFM—Biology, Link?pings Universitet, 581 83, Link?ping, Sweden
  4. UCL Genetics Institute, UCL, Gower Street, London, WC1E 6BT, UK
  5. IBERS, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion, SY23 3EB, UK
  6. Faculty of Life Sciences, Manchester Institute of Biotechnology, University of Manchester, Manchester, M1 7DN, UK
  

文摘

Chloroplast microsatellites (SSRs) are conserved within wheat species, yet are sufficiently polymorphic between and within species to be useful for evolutionary studies. This study describes the relationships among a very large set of accessions of Triticum urartu Thum. ex Gandil., T. dicoccoides (K?rn. ex Asch. et Graebn.) Schweinf., T. dicoccon Schrank, T. durum Desf., T. spelta L., and T. aestivum L. s. str. based on their cpSSR genotypes. By characterising the chloroplast diversity in each wheat species in the evolutionary series, the impact on diversity of major evolutionary events such as domestication and polyploidyisation was assessed. We detected bottlenecks associated with domestication, polyploidisation and selection, yet these constrictions were partially offset by mutations in the chloroplast SSR loci that generated new alleles. The discrete cpSSR alleles and haplotypes observed in T. urartu and Aegilops tauschii, combined with other species specific polymorphisms, provide very strong evidence that concur with current opinion that neither species was the maternal and thus cytoplasmic donor for polyploid wheats. Synthetic hexaploid wheats possessed the same chloroplast haplotypes as their tetraploid progenitors demonstrating how the novel synthetic wheat lines have captured chloroplast diversity from the maternal parents, the chloroplast is maternally inherited and novel alleles are not created by genomic rearrangements triggered by the polyploidisation event.