| Popis: |
Trichodorids are plant-ectoparasitic nematodes, causing economically important diseases in many crops. In this study, we characterised ribosomal DNA (rDNA) of four trichodorid species from two different genera (i.e., Paratrichodorus macrostylus, P. pachydermus, Trichodorus primitivus and T. similis). Sequence data from the 18S and 5.8S genes showed high similarity; in contrast, sequence data from the internal transcribed spacer regions (ITS) were highly variable. Sequence divergence between the two genera included many insertions and deletions. Trichodorus primitivus and T. similis ITS regions of 1537 and 1303 bp, respectively, are the longest reported to date in the Phylum Nematoda. Further exploration of the sequence data indicated perfect and non-homologous repeats which were confined to the middle of the ITS regions. |
