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<p><i>Oreocome striata</i> (DC.) Pimenov &amp; Kljuykov is an important medicinal plant cultivated in the highland regions of Vietnam, where information on soil-borne pests associated with this crop remains limited. During a nematological survey of <i>O. striata</i> fields, a nematode population belonging to the genus <i>Pratylenchus</i>, one of the most damaging plant-parasitic nematodes, was recovered. Detailed morphological observations and molecular characterization based on the 18S rRNA and D2–D3 expansion segments of the 28S rRNA confirmed the identity of the species as <i>Pratylenchus crenatus</i> Loof, 1960. Females of <i>P. crenatus</i> from Vietnam had diagnostic traits highly similar to earlier descriptions of <i>P. crenatus</i> across the world. Bayesian phylogenetic analyses placed the Vietnamese sequences within well-supported clades comprising all sequences of <i>P. crenatus</i> from GenBank, providing strong molecular support for species identification. This study reported the first occurrence of <i>P. crenatus</i> in Vietnam and the first documented association of this species with <i>O. striata</i> worldwide. The findings extend both the known geographical distribution and host range of <i>P. crenatus</i> and highlight the need for further investigations into its pathogenic potential and management in medicinal plant production systems.</p>

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First report of the root-lesion nematode Pratylenchus crenatus (Nematoda: Pratylenchidae) associated with the medicinal plant Oreocome striata (DC.) Pimenov & Kljuykov in Vietnam

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Thi Duyen Nguyen,
  • Huu Tien Nguyen,
  • Quang Phap Trinh,
  • Thi Mai Linh Le

摘要

Oreocome striata (DC.) Pimenov & Kljuykov is an important medicinal plant cultivated in the highland regions of Vietnam, where information on soil-borne pests associated with this crop remains limited. During a nematological survey of O. striata fields, a nematode population belonging to the genus Pratylenchus, one of the most damaging plant-parasitic nematodes, was recovered. Detailed morphological observations and molecular characterization based on the 18S rRNA and D2–D3 expansion segments of the 28S rRNA confirmed the identity of the species as Pratylenchus crenatus Loof, 1960. Females of P. crenatus from Vietnam had diagnostic traits highly similar to earlier descriptions of P. crenatus across the world. Bayesian phylogenetic analyses placed the Vietnamese sequences within well-supported clades comprising all sequences of P. crenatus from GenBank, providing strong molecular support for species identification. This study reported the first occurrence of P. crenatus in Vietnam and the first documented association of this species with O. striata worldwide. The findings extend both the known geographical distribution and host range of P. crenatus and highlight the need for further investigations into its pathogenic potential and management in medicinal plant production systems.