Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Phylogeny of Criconematina Siddiqi, 1980 (Nematoda: Tylenchida) based on morphology and D2-D3 expansion segments of the 28S-rRNA gene sequences with application of a secondary structure model

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

For more content, see Nematologica.

The suborder Criconematina is a large group of ecto- and endoparasitic nematodes, including several species of major agricultural importance. The D2-D3 expansion segments of the 28S nuclear ribosomal RNA gene were amplified and sequenced from 23 nominal and six unidentified species from the genera Mesocriconema, Criconemoides, Ogma, Criconema, Xenocriconemella, Hemicriconemoides, Hemicycliophora, Paratylenchus, Tylenchulus, Trophonema and Sphaeronema, together with outgroup taxa from Tylenchidae (Aglenchus) and Atylenchidae (Eutylenchus). A sequence alignment optimised using the secondary structure model was analysed using maximum parsimony, maximum likelihood and Bayesian inference approaches under two models. All analyses yielded a similar topology with differences primarily in the position of poorly supported clades. Although some molecular trees differ from the previous morphologically based hypotheses of criconematid phylogeny, maximum likelihood tests did not yield statistically significant differences between some of the tested classical morphological and molecular topologies. DNA data support monophyly for the genera Mesocriconema, Hemicriconemoides and Criconema and reject the hypothesis of a single origin of criconematids with a cuticular sheath or 'double cuticle'. Application of the complex model of rRNA evolution, considering paired nucleotides for the stem and unpaired nucleotides for the loop region, resulted in a majority rule consensus Bayesian tree with unresolved relationships between main clades. This lack of resolution is expected by the low number of independently evolving nucleotides. Sequence divergence in this DNA segment between populations of Mesocriconema xenoplax, M. sphaerocephalum and Hemicriconemoides cocophillus suggest the presence of several sibling species under these taxa names.

Loading

Full text loading...

/content/journals/10.1163/156854105776186307
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/156854105776186307
Loading

Article metrics loading...

/content/journals/10.1163/156854105776186307
2005-12-01
2016-12-02

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Nematology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation