First report of Hemicriconemoides litchi associated with Piper sarmentosum and revision of the genus Hemicriconemoides in Vietnam

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

doi:10.21307/jofnem-2020-074

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…2). Findings in the current study were in agreement with the phylogenies of Hemicriconemoides species studied using 28S rDNA (Nguyen et al, 2020). Hemicriconemoides brachyurus and H. fujianensis are placed together in a group.…”

Section: Molecular Analysissupporting

confidence: 89%

“…The trees were visualized with the TreeView program. Also, as outgroups, Criconemoides myungsugae (MH444644) was selected based on Nguyen et al (2020). The original partial 18S rDNA sequence of H. brachyurus was deposited in GenBank under the accession numbers OM914954.…”

Section: Nematode Extraction Processing and Lm Picturesmentioning

confidence: 99%

“…Members of Hemicriconemoides are commonly known as sheath nematodes. The genus is constituted by ectoparasites, and the member species tend to cause yield losses only at high densities (Nguyen et al, 2020). However, their ecological behavior has not yet been studied well.…”

Section: Introductionmentioning

confidence: 99%

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Observation on Hemicriconemoides brachyurus (Loos, 1949) Chitwood & Birchfield, 1957 associated with grass in South Africa

Shokoohi

2022

Helminthologia

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Summary Hemicriconemoides brachyurus was identified morphologically, using body annuli number (103105), stylet length (49-52 μm), tail conical with small rounded lobe, spermatheca with round sperm, and VL/VB (1.3). Molecular analysis was also undertaken, based on the 18S rDNA region, and the obtained DNA sequence data confirmed the present population from South Africa as Hemicriconemoides. Phylogenetic analysis using the Bayesian inference method places this population close to H. fujianensis from China (MH444620-21; MH444626-28). To the best of our knowledge, this is the first report of the 18S rDNA sequence for H. brachyurus.

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Section: Molecular Analysissupporting

confidence: 89%

Section: Nematode Extraction Processing and Lm Picturesmentioning

confidence: 99%

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Observation on Hemicriconemoides brachyurus (Loos, 1949) Chitwood & Birchfield, 1957 associated with grass in South Africa

Shokoohi

2022

Helminthologia

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“… Hemicriconemoides mangiferae Siddiqi, 1961→ H . strictathecatus Esser, 1960 (according to Nguyen et al, 2020). Scutellonema sheri Edward & Rai, 1970→ S .…”

Section: Resultsmentioning

confidence: 99%

Diversity of plant‐parasitic nematodes (PPNs) associated with medicinal plants in Vietnam, Vietnamese PPN checklist and a pictorial key for their identification

Nguyen,

Trinh,

Nguyen

et al. 2023

Plant Pathology

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Plant‐parasitic nematodes (PPNs) are one of the most damaging pests to plants and are able to cause significant damage to all parts of plants, including stems, leaves, flowers, fruits and roots. Studies on the diversity, host range, distribution and identification methods of PPNs are therefore vital in order to create a basis for management. This current study represents the first dedicated investigation of PPNs from medicinal plants in Vietnam, focusing on the diversity of nematodes associated with 23 different plant species. In combination with a literature review of PPNs in Vietnam, this work has resulted in an updated list of 217 PPN species belonging to 40 genera, 15 families and three orders and also provides a pictorial online key for the identification of 52 most common and important PPN genera of the world. This key is based on the most crucial diagnostic features of PPN females, including female body shape, cuticle, labial shape, cephalic framework, stylet, stylet base, pharynx, median bulb, pharyngeal gland, vulva, tail shape and phasmid. Pictorial representations of these genera and their diagnostic characters are included in the browser‐based key to benefit users from all levels in nematology, be they beginners or experts.

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Remarks on phylogeny and molecular variations of criconematid species (Nematoda: Criconematidae) with case studies from Vietnam

Nguyen

et al. 2022

Sci Rep

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The family Criconematidae is a remarkable group of nematodes, containing roughly 600 nominal root-ectoparasitic species, of which many species are known to be significant agricultural pests. Strikingly, our phylogenetic analyses based on 18S, D2-D3 of 28S rRNA, and COI mtDNA sequences of criconematid species, supported by tree topology tests (SH and AU tests), revealed that almost all studied genera, including Criconema, Ogma, Crossonema, Discocriconema, Hemicriconemoides, Criconemoides, Mesocriconema, and Lobocriconema, are not monophyletic groups, a finding that is partly contrary to those of previous studies on these groups. Our results suggest that key morphological characters used in the classification of Criconematidae are the consequence of convergent evolution. It is clear from our studies that the species status of at least 40 sequences of criconematid species from GenBank must be either revised or reconsidered, with analyses based on a polyphasic approach that includes different tree- and distance-based molecular species-delimitation methods (bPTP, GMYC, ABGD1, and ABGD2). Our studies found the ABGD2 output of the automatic barcode method to agree remarkably well with established species delimitations, while in general, the four species-delimitation results corresponding to three barcode regions forwarded significantly more putative species compared to those originally considered. This study also characterised for the first time the populations of Criconemoides myungsugae and Discocriconemella hensungica associated with Vietnamese ginseng, one of the most precious and rare ginseng varieties in the world. Although these populations are morphologically in agreement with the original descriptions of C. myungsugae and D. hengsungica, their molecular data display notable variations compared to the sequences deposited in GenBank. These species demonstrate clearly the immense molecular variations that can be observed in several species of the family Criconematidae.

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First report of Hemicriconemoides litchi associated with Piper sarmentosum and revision of the genus Hemicriconemoides in Vietnam

Cited by 4 publications

References 12 publications

Observation on Hemicriconemoides brachyurus (Loos, 1949) Chitwood & Birchfield, 1957 associated with grass in South Africa

Observation on Hemicriconemoides brachyurus (Loos, 1949) Chitwood & Birchfield, 1957 associated with grass in South Africa

Diversity of plant‐parasitic nematodes (PPNs) associated with medicinal plants in Vietnam, Vietnamese PPN checklist and a pictorial key for their identification

Remarks on phylogeny and molecular variations of criconematid species (Nematoda: Criconematidae) with case studies from Vietnam

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