Assessing the speciation boundaries in Pasteuria spp. (Abstract in rivista)

Type
Label
  • Assessing the speciation boundaries in Pasteuria spp. (Abstract in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ciancio A., Rosso L., Maresca di Serracapriola M., Favre R., Cermola M. (2007)
    Assessing the speciation boundaries in Pasteuria spp.
    (literal)
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  • Ciancio A., Rosso L., Maresca di Serracapriola M., Favre R., Cermola M. (literal)
Pagina inizio
  • 146 (literal)
Pagina fine
  • 147 (literal)
Convegno
  • XXXIX Annual Meeting of ONTA (literal)
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  • Cordoba, Argentina (literal)
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  • 37 (literal)
Rivista
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  • Nematropica, 37(2), 146-147. Proceedings of the XXXIX Annual Meeting of ONTA, 29 October-2 November, Villa Carlos Paz, Cordoba, Argentina. (literal)
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  • 2 (literal)
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  • The increasing number of Pasteuria spp. described thus far underlines the need for the identification of species definition criteria suitable for this group of rhizosphere bacteria. 16S rDNA sequence data, ultrastructural diversity of endospores, host nematode groups and parasitism specificity are the main criteria used to define Pasteuria spp. Analysis of 16S rDNA data obtained by PCR amplification of a 420 bp fragment from two Pasteuria spp. from Helicotylenchus sp. and Tylenchulus semipenetrans, respectively, compared with Gen-Bank-available sequences, showed the occurrence of two new putative species. Molecular clock analysis applied to the 16S divergence of these fragments revealed that Pasteuria ancestors gave rise to a wide phylogenetic radiation, whose extent and diversity are still largely unexplored. A review of endospore ultrastructural diversity shows a concomitant range of morphological and functional adaptations. Endospores from other Pasteuria spp., including two distinct forms from Xiphinema diversicaudatum and X. pachtaicum, showed varying patterns of cortex organization, wall layers and/or central core rings, as well as of parasporal fiber organization and type. Although host nematode appears as a practical criterion for species identification, the occurrence of more than one Pasteuria spp. in hosts from the same genera, i.e. Xiphinema, Heterodera and Meloidogyne spp., casts doubts about its value. The combination of 16S rDNA nucleotide polymorphism analysis with ultrastructural data provides more reliable criteria for species definition. Finally, the lack of type material for P. thornei prompts the need for research efforts to identify available phenotypes through nucleotide and ultrastructural data, as well as with host specificity tests. (literal)
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  • Ciancio A., Rosso L.C., Maresca di Serracapriola M.T., - CNR, Ist. protezione Piante - Sez. di Bari Favre R., Cermola M., CNR, Ist. di Genetica e Biofisica - Napoli (literal)
Titolo
  • Assessing the speciation boundaries in Pasteuria spp. (literal)
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