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The Korean Society of Plant Pathology (한국식물병리학회)
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A Revision of the Phylogeny of Helicotylenchus Steiner, 1945 (Tylenchida: Hoplolaimidae) as Inferred from Ribosomal and Mitochondrial DNA

  • Abraham Okki, Mwamula (Research Institute of Invertebrate Vector, Kyungpook National University) ;
  • Oh-Gyeong Kwon (Department of Ecological Science, Kyungpook National University) ;
  • Chanki Kwon (Department of Plant Protection and Quarantine, Graduate School of Plant Protection and Quarantine, Kyungpook National University) ;
  • Yi Seul Kim (Research Institute of Invertebrate Vector, Kyungpook National University) ;
  • Young Ho Kim (Research Institute of Invertebrate Vector, Kyungpook National University) ;
  • Dong Woon Lee (Research Institute of Invertebrate Vector, Kyungpook National University)
  • Received : 2024.01.17
  • Accepted : 2024.03.03
  • Published : 2024.04.01
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Abstract

Identification of Helicotylenchus species is very challenging due to phenotypic plasticity and existence of cryptic species complexes. Recently, the use of rDNA barcodes has proven to be useful for identification of Helicotylenchus. Molecular markers are a quick diagnostic tool and are crucial for discriminating related species and resolving cryptic species complexes within this speciose genus. However, DNA barcoding is not an error-free approach. The public databases appear to be marred by incorrect sequences, arising from sequencing errors, mislabeling, and misidentifications. Herein, we provide a comprehensive analysis of the newly obtained, and published DNA sequences of Helicotylenchus, revealing the potential faults in the available DNA barcodes. A total of 97 sequences (25 nearly full-length 18S-rRNA, 12 partial 28S-rRNA, 16 partial internal transcribed spacer [ITS]-rRNA, and 44 partial cytochrome c oxidase subunit I [COI] gene sequences) were newly obtained in the present study. Phylogenetic relationships between species are given as inferred from the analyses of 103 sequences of 18S-rRNA, 469 sequences of 28S-rRNA, 183 sequences of ITS-rRNA, and 63 sequences of COI. Remarks on suggested corrections of published accessions in GenBank database are given. Additionally, COI gene sequences of H. dihystera, H. asiaticus and the contentious H. microlobus are provided herein for the first time. Similar to rDNA gene analyses, the COI sequences support the genetic distinctness and validity of H. microlobus. DNA barcodes from type material are needed for resolving the taxonomic status of the unresolved taxonomic groups within the genus.

Keywords

Acknowledgement

This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Agriculture, Food and Rural Affairs Convergence Technologies Program for Educating Creative Global Leader Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (no.321001-03).

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