Morphological and Molecular Characteristics of Pratylenchus haiduongensis sp. n., a New Species of Root–Lesion Nematodes Associated with Carrot in Vietnam

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Journal of Nematology

Society of Nematologists

Subject: Life Sciences

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ISSN: 0022-300X
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VOLUME 49 , ISSUE 3 (September 2017) > List of articles

Morphological and Molecular Characteristics of Pratylenchus haiduongensis sp. n., a New Species of Root–Lesion Nematodes Associated with Carrot in Vietnam

THI DUYEN NGUYEN / THI MAI LINH LE / HUU TIEN NGUYEN / THI ANH DUONG NGUYEN / GRACIA LIEBANAS / QUANG PHAP TRINH

Keywords : carrot, molecular, morphology, new species, root–lession nematode, SEM, Vietnam.

Citation Information : Journal of Nematology. Volume 49, Issue 3, Pages 276-285, DOI: https://doi.org/10.21307/jofnem-2017-073

License : (CC BY 4.0)

Received Date : 09-May-2017 / Published Online: 04-December-2017

Open Access article funded by Basic Foundation project from the Institute of Ecology and Biological Resource (IEBR) , National Foundation for Science and Technology Development (NAFOSTED)

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Abstract: Pratylenchus haiduongensis sp. n. is described as associated with carrot (Daucus carota subsp. sativus (Hoffm.) Sch€ubl. & G. Martens) in Hai Duong Province, Vietnam. P. haiduongensis sp. n. is characterized by the lip region with three annuli and slightly separated from the body. Stylet knobs are rounded (never indented anteriorly). The lateral field includes four incisures, bearing areolation at the pharynx region and tail region and occasionally appears in the vulval region. Sometimes the appearances of oblique broken striaes divide the lateral field into five or six incisures. The ovary is distinct with one row of oocytes. Spermatheca is oval in shape with round central cavity, without sperm or reduced in some specimens. The postvuval uterine sac is long surpassing the vulva body diameter by 2 to 2.5 times (PUS = 31 to 65 mm). High vulva position with V = 66 to 75%. The tail shape can be subhemispherical with a smooth, slightly indented, broadly smooth, or cleft terminus observed in some specimens. The matrix code of P. haiduongensis sp. n. is: A2, B1, C4, D(1,3), E1, F(5,6), G(1,2), H(1,4); I(1,2,3,4), J1, K(1,2) according to Castillo and Vovlas (2007). The LSU–D2D3 segment and the ITS–rDNA region of this species were amplified and sequenced. The morphological characters and molecular phylogenetic analyses confirmed that this is a new species of the genus Pratylenchus in Vietnam.

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