Russian Journal of Genetics

, Volume 41, Issue 5, pp 518–528 | Cite as

Genomic Configuration of the Autotetraploid Oat Species Avena macrostachya Inferred from Comparative Analysis of ITS1 and ITS2 Sequences: on the Oat Karyotype Evolution during the Early Events of the Avena Species Divergence

  • A. V. Rodionov
  • N. B. Tyupa
  • E. S. Kim
  • E. M. Machs
  • I. G. Loskutov
Plant Genetics


To examine the genomic configuration of Avena macrostachya, internal transcribed spacers, ITS1 and ITS2, as well as nuclear 5.8S rRNA genes from three oat species with AsAs karyotype (A. wiestii, A. hirtula, and A. atlantica), and those from A. longiglumis (AlAl), A. canariensis (AcAc), A. ventricosa (CvCv), A. pilosa, and A. clauda (CpCp) were sequenced. All species of the genus Avena examined represented a monophyletic group (bootstrap index = 98), within which two branches, i.e., species with A- and C-genomes, were distinguished (bootstrap indices = 100). The subject of our study, A. macrostachya, albeit belonging to the phylogenetic branch of C-genome oat species (karyotype with submetacentic and subacrocentric chromosomes), has preserved an isobrachyal karyotype, (i.e., that containing metacentric chromosomes), probably typical of the common Avena ancestor. It was suggested to classify the A. macrostachya genome as a specific form of C-genome, Cm-genome. Among the species from other genera studied, Arrhenatherum elatius was found to be the closest to Avena in ITS1 and ITS sequence. Phylogenetic relationships between Avena and Helictotrichon remain intriguingly uncertain. The HPR389153 sequence from H. pratense genome was closest to the ITS1 sequences specific to the Avena A-genomes (p-distance = 0.0237), while the p-distance between this sequence and the ITS1 of A. macrostachya reached 0.1221. On the other hand, HAD389117 from H. adsurgens was close to the ITS1 specific to Avena C-genomes (p-distance = 0.0189), while its differences from the A-genome specific ITS1 sequences reached 0.1221. It seems likely that the appearance of highly polyploid (2n = 12x-21x) species of H. pratense and H. adsurgens could be associated with interspecific hybridization involving Mediterranean oat species carrying A- and C-genomes. A hypothesis on the pathways of Avena chromosomes evolution during the early events the oat species divergence is proposed.


Species Divergence Phylogenetic Relationship Specific Form Early Event Interspecific Hybridization 
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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  • A. V. Rodionov
    • 1
  • N. B. Tyupa
    • 1
  • E. S. Kim
    • 1
  • E. M. Machs
    • 1
  • I. G. Loskutov
    • 2
  1. 1.Komarov Botanical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Vavilov Institute for Plant IndustryRussian Academy of Agricultural ScienceSt. PetersburgRussia

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