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Characterization and pathogenicity of Pratylenchus vandenbergae stat. nov. (Tylenchina: Pratylenchidae), a highly pathogenic root-lesion nematode parasitizing crops in Kenya and South Africa

(2024) PLANT PATHOLOGY. 73(3). p.706-723
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Abstract
A highly fecund root-lesion nematode parasitizing a variety of crops was discovered and found to be widespread in Kenya and South Africa. These populations were molecularly identical to Pratylenchus teres teres and P. teres vandenbergae based on D2-D3 of 28S rDNA and Hsp90 sequences. However, based on morphological differences with the original description of P. teres and its different geographical distribution, Pratylenchus vandenbergae stat. nov., previously known as subspecies P. teres vandenbergae, is recognized as a separate species. This species is characterized by a slightly offset labial region with three annuli, en face morphology belonging to Group II, lateral field with four incisures with two outer bands areolated as observed under a light microscope and the inner band also partially areolated at the vulva region as observed in scanning electron microscopy view, a robust stylet (14-17 mu m) with rounded knobs and subcylindrical tail with annulated tail tip. This important and common species remained largely under the radar, probably due to identifications based only on sequence similarity, including mislabelled Pratylenchus bolivianus sequences in GenBank. Pathogenicity of P. vandenbergae stat. nov. in finger millet roots was confirmed through acid fuchsin staining, and reproduction and pathogenicity tests in maize, soybean, sunflower and tomato plants demonstrated its capacity to affect crop growth. Life cycle comparison with P. penetrans in vitro showed a similar life cycle length but significantly higher fecundity. Finally, significant differences in pathogenicity and reproduction of P. vandenbergae stat. nov. were found both at genotype level (finger millet genotypes OKHALE-1 & KNE1034) and crop level (maize, soybean, sunflower and tomato plants).
Keywords
finger millet, life cycle, molecular, morphology, morphometrics, reproduction, MOLECULAR CHARACTERIZATION, GENUS PRATYLENCHUS, N., PENETRANS, POTATO, SPP., RDNA

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MLA
Wanjau, Cecilia Ngonyo, et al. “Characterization and Pathogenicity of Pratylenchus Vandenbergae Stat. Nov. (Tylenchina: Pratylenchidae), a Highly Pathogenic Root-Lesion Nematode Parasitizing Crops in Kenya and South Africa.” PLANT PATHOLOGY, vol. 73, no. 3, 2024, pp. 706–23, doi:10.1111/ppa.13836.
APA
Wanjau, C. N., Knoetze, R., Girgan, C., Pili, N. N., Engelbrecht, G., Couvreur, M., & Bert, W. (2024). Characterization and pathogenicity of Pratylenchus vandenbergae stat. nov. (Tylenchina: Pratylenchidae), a highly pathogenic root-lesion nematode parasitizing crops in Kenya and South Africa. PLANT PATHOLOGY, 73(3), 706–723. https://doi.org/10.1111/ppa.13836
Chicago author-date
Wanjau, Cecilia Ngonyo, Rinus Knoetze, Chantelle Girgan, Njira Njira Pili, Gerhard Engelbrecht, Marjolein Couvreur, and Wim Bert. 2024. “Characterization and Pathogenicity of Pratylenchus Vandenbergae Stat. Nov. (Tylenchina: Pratylenchidae), a Highly Pathogenic Root-Lesion Nematode Parasitizing Crops in Kenya and South Africa.” PLANT PATHOLOGY 73 (3): 706–23. https://doi.org/10.1111/ppa.13836.
Chicago author-date (all authors)
Wanjau, Cecilia Ngonyo, Rinus Knoetze, Chantelle Girgan, Njira Njira Pili, Gerhard Engelbrecht, Marjolein Couvreur, and Wim Bert. 2024. “Characterization and Pathogenicity of Pratylenchus Vandenbergae Stat. Nov. (Tylenchina: Pratylenchidae), a Highly Pathogenic Root-Lesion Nematode Parasitizing Crops in Kenya and South Africa.” PLANT PATHOLOGY 73 (3): 706–723. doi:10.1111/ppa.13836.
Vancouver
1.
Wanjau CN, Knoetze R, Girgan C, Pili NN, Engelbrecht G, Couvreur M, et al. Characterization and pathogenicity of Pratylenchus vandenbergae stat. nov. (Tylenchina: Pratylenchidae), a highly pathogenic root-lesion nematode parasitizing crops in Kenya and South Africa. PLANT PATHOLOGY. 2024;73(3):706–23.
IEEE
[1]
C. N. Wanjau et al., “Characterization and pathogenicity of Pratylenchus vandenbergae stat. nov. (Tylenchina: Pratylenchidae), a highly pathogenic root-lesion nematode parasitizing crops in Kenya and South Africa,” PLANT PATHOLOGY, vol. 73, no. 3, pp. 706–723, 2024.
@article{01HGMXBC1DWPPRCX132VV3VT0C,
  abstract     = {{A highly fecund root-lesion nematode parasitizing a variety of crops was discovered and found to be widespread in Kenya and South Africa. These populations were molecularly identical to Pratylenchus teres teres and P. teres vandenbergae based on D2-D3 of 28S rDNA and Hsp90 sequences. However, based on morphological differences with the original description of P. teres and its different geographical distribution, Pratylenchus vandenbergae stat. nov., previously known as subspecies P. teres vandenbergae, is recognized as a separate species. This species is characterized by a slightly offset labial region with three annuli, en face morphology belonging to Group II, lateral field with four incisures with two outer bands areolated as observed under a light microscope and the inner band also partially areolated at the vulva region as observed in scanning electron microscopy view, a robust stylet (14-17 mu m) with rounded knobs and subcylindrical tail with annulated tail tip. This important and common species remained largely under the radar, probably due to identifications based only on sequence similarity, including mislabelled Pratylenchus bolivianus sequences in GenBank. Pathogenicity of P. vandenbergae stat. nov. in finger millet roots was confirmed through acid fuchsin staining, and reproduction and pathogenicity tests in maize, soybean, sunflower and tomato plants demonstrated its capacity to affect crop growth. Life cycle comparison with P. penetrans in vitro showed a similar life cycle length but significantly higher fecundity. Finally, significant differences in pathogenicity and reproduction of P. vandenbergae stat. nov. were found both at genotype level (finger millet genotypes OKHALE-1 & KNE1034) and crop level (maize, soybean, sunflower and tomato plants).
}},
  author       = {{Wanjau, Cecilia Ngonyo and Knoetze, Rinus and Girgan, Chantelle and Pili, Njira Njira and Engelbrecht, Gerhard and Couvreur, Marjolein and Bert, Wim}},
  issn         = {{0032-0862}},
  journal      = {{PLANT PATHOLOGY}},
  keywords     = {{finger millet,life cycle,molecular,morphology,morphometrics,reproduction,MOLECULAR CHARACTERIZATION,GENUS PRATYLENCHUS,N.,PENETRANS,POTATO,SPP.,RDNA}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{706--723}},
  title        = {{Characterization and pathogenicity of Pratylenchus vandenbergae stat. nov. (Tylenchina: Pratylenchidae), a highly pathogenic root-lesion nematode parasitizing crops in Kenya and South Africa}},
  url          = {{http://doi.org/10.1111/ppa.13836}},
  volume       = {{73}},
  year         = {{2024}},
}

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