<b>Intra-specific variation of </b><b><i>Xiphinema brevicolle </i></b><b>Lordello </b><b><i>et </i></b><b>Costa, 1961 (Nematoda: Longidoridae) in Japan </b>

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  • Sakai Hiromichi
    National Agriculture and Food Research Organization, Agricultural Research Center
  • Takeda Ai
    Chiba Prefectural Agriculture and Forestry Research Center
  • Mizukubo Takayuki
    National Agriculture and Food Research Organization, Agricultural Research Center

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Other Title
  • 日本産コーヒーオオハリセンチュウの種内変異
  • Intra-specific variation of Xiphinema brevicolle Lordello et Costa, 1961 (Nematoda: Longidoridae) in Japan

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Abstract

During a survey for plant-parasitic nematodes of commercial ornamental plant nurseries in Japan, four populations of Xiphinema brevicolle Lordello et Costa, 1961 were detected from root zone soil samples of Japanese holly (Ilex crenata Thunb. ) at four locations and examined to study the intra-specific variations. Two populations are comparatively larger in body size than the other two though their morphometrics overlap. Phylogenetic analysis of DNA sequences of the mitochondrial COI region by Maximum Likelihood method revealed two divergent groups among the six sequence variants whereas DNA sequences of the nuclear 18S rDNA region and the nuclear large subunit rDNA D2/D3 region were of little use to clarify the relationship between the populations. Referring to the two COI groups, differences within each group (< 0.5%) are regarded as intra-populational variations and those between the two groups (7.2-7.6%) are regarded as inter-populational variations. One population only accommodates individuals of both of the COI groups and has a wider range of body lengths than the other populations. Finally, this population is considered as a collection of conspecific but clearly distinct populations and such a case may be a burden in examination of a given sample of X. americanum-group species because a cohabitant mixture of distinct conspecific populations with visually undetectable differences may be present.

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