Meloidogyne aberrans sp. nov. (Nematoda: Meloidogynidae), a new root-knot nematode parasitizing kiwifruit in China

PLoS One. 2017 Aug 30;12(8):e0182627. doi: 10.1371/journal.pone.0182627. eCollection 2017.

Abstract

High infection rates of roots of wild kiwifruit (Actinidia chinensis Planch) and soil infestation by a root-knot nematode were found in Anshun, GuiZhou Province, China. Morphology, esterase phenotype and molecular analyses confirmed that this nematode was different from previously described root-knot nematodes. In this report, the species is described, illustrated and named Meloidogyne aberrans sp. nov. The new species has a unique combination of characters. A prominent posterior protuberance, round and faint perineal pattern and a medium-length stylet (13.6-15.5 μm) characterized the females. Second-stage juveniles (J2) were characterized by a smooth lip region with distinctly protruded medial lips and a depression in outline at the oral aperture, a relatively long stylet (15.9-16.8 μm), four incisures in the lateral field and a very short, even poorly defined, hyaline tail terminus (2.2-5.5 μm). More incisures (11-15) existed in the lateral field of males, and the stylet and spicules of males were 18.2-19.6 μm and 22.7-36.8 μm long respectively. Egg masses were typically produced within the roots of kiwifruit. The new species had a rare Est phenotype, S2. Phylogenetic trees inferred from SSU, LSU D2D3, ITS, and partial coxII-16S rRNA revealed that M. aberrans sp. nov. was within the Meloidogyne clade and was distinguished from all described root-knot nematodes. Moreover, from histopathological observations, M. aberrans sp. nov. induced the formation of multinucleate giant cells.

MeSH terms

  • Actinidia / parasitology*
  • Animals
  • China
  • Female
  • Male
  • Microscopy, Electron, Scanning
  • Photomicrography
  • Phylogeny
  • Plant Diseases / parasitology*
  • Plant Roots / parasitology*
  • RNA, Ribosomal, 16S / genetics
  • Tylenchoidea / genetics
  • Tylenchoidea / physiology*
  • Tylenchoidea / ultrastructure

Substances

  • RNA, Ribosomal, 16S

Grants and funding

This work was supported by grants from the National Key Basic Research Program of China (973 Program, Nos. 2013CB127501; 2013CB127502), National Natural Science Foundation of China (Nos. 31171824; 31471750), the Special Fund for Agro-scientific Research in Public Interest of China (No. 201103018), and Planning Project for Science and Technology in Guangdong Province (No. 2010A202507001-68). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.