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Genetic and Haplotype Diversity of Hoplolaimus (Nematoda: Hoplolaimidae) Through Analysis of COI of mtDNA
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Genetic and Haplotype Diversity of Hoplolaimus (Nematoda: Hoplolaimidae) Through Analysis of COI of mtDNA
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Genetic and Haplotype Diversity of Hoplolaimus (Nematoda: Hoplolaimidae) Through Analysis of COI of mtDNA
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Journal Article
Genetic and Haplotype Diversity of Hoplolaimus (Nematoda: Hoplolaimidae) Through Analysis of COI of mtDNA
2025
Overview
Lance nematodes (Hoplolaimus spp.) feed on the roots of various plants, including key horticultural products. An investigation of the genetic diversity and structure of six Hoplolaimus species, utilizing the cytochrome c oxidase I (COI) of the mtDNA gene, was based on 174 sequences available on the NCBI. Based on the COI of mtDNA, the haplotype analysis revealed 44 haplotypes. Nucleotide diversity was low among all species of Hoplolaimus, except for H. magnistylus (π = 0.04915) and H. stephanus (π = 0.06746). In contrast, haplotype diversity (Hd) was high, especially for H. stephanus (Hd = 0.89) and H. pararobustus (Hd = 0.90). Phylogenetic analysis grouped the various populations into eight clades, and the result showed that H. magnistylus was placed in three different clades, which showed high variability in haplotype supported by the haplotype network. Neutrality tests and mismatch distribution based on the mtDNA supported the hypothesis of a constant population with no expansion in Hoplolaimus, except for H. concaudajuvencus (Tajima (D) = −0.84971) and H. columbus (Tajima (D) = −0.87674). In conclusion, genetic analysis showed a neutral evolution amongst the Hoplolaimus species. The result of the present study provides a better insight into the Hoplolaimus species toward species delimitation and managing this plant-parasitic nematode in various crops.
