Ribosomal and mitochondrial DNA analyses of Xiphinema americanum-group populations

Stela S. Lazarova*, Gaynor Malloch, Claudio M.G. Oliveira, Judith Hübschen, Roy Neilson

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

88 Citations (Scopus)

Abstract

The 18S ribosomal DNA (rDNA) and cytochrome oxidase I region of mitochondrial DNA (mtDNA) were sequenced for 24 Xiphinema americanum-group populations sourced from a number of geographically disparate locations. Sequences were subjected to phylogenetic analysis and compared. 18S rDNA strongly suggested that only X. pachtaicum, X. simile (two populations) and a X. americanum s.l. population from Portugal were different from the other 20 populations studied, whereas mtDNA indicated some heterogeneity between populations. Phylogenetically, based on mtDNA, an apparent dichotomy existed amongst X. americanum-group populations from North America and those from Asia, South America and Oceania. Analyses of 18S rDNA and mtDNA sequences underpin the classical taxonomic issues of the X. americanum-group and cast doubt on the degree of speciation within the X. americanum-group.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalJournal of Nematology
Volume38
Issue number4
Publication statusPublished - Dec 2006

Keywords

  • 18S rDNA
  • Longidorid
  • Longidoridae
  • Molecular analysis
  • Nematode
  • Taxonomy
  • mtDNA

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