<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The root-lesion nematodes (RLN), <italic>Pratylenchus</italic> spp., are among the major plant-parasitic nematodes affecting yam (<italic>Dioscorea</italic> spp.) production in West Africa. The distribution and diversity of RLN species associated with yam was investigated through a soil and tuber survey of the main producing areas in Nigeria and Ghana. <italic>Pratylenchus</italic> spp. were detected in the yam rhizosphere in 59% of 81 soil samples from Ghana and 39% of 114 soil samples from Nigeria. <italic>Pratylenchus</italic> spp. were detected in 24 of 400 tubers examined, in combination with root-knot nematodes (<italic>Meloidogyne</italic> spp.) and their associated damage of galls and crazy roots (79%), and with yam nematode (<italic>Scutellonema bradys</italic>) and their associated damage of dry rot (17%), although no specific additional symptoms were observed for <italic>Pratylenchus</italic> spp. Species of <italic>Pratylenchus</italic> were identified by their morphological features and by sequences of the D2-D3 region of the 28 S rDNA gene and the mitochondrial cytochrome oxidase I gene (<italic>COI</italic>). <italic>Pratylenchus brachyurus</italic> was the most frequent RLN species in both the rhizosphere and tubers of yam. <italic>Pratylenchus hexincisus</italic> was recovered from one tuber collected in Nigeria. While further investigations are required to establish the host status of yam for this nematode, this appears to be the first record of <italic>P. hexincisus</italic> on yam. The present taxonomical status of <italic>P. scribneri</italic> and <italic>P. hexincisus</italic> is discussed.</p>
</abstract>

The root-lesion nematodes (RLN), Pratylenchus spp., are among the major plant-parasitic nematodes affecting yam (Dioscorea spp.) production in West Africa. The distribution and diversity of RLN species associated with yam was investigated through a soil and tuber survey of the main producing areas in Nigeria and Ghana. Pratylenchus spp. were detected in the yam rhizosphere in 59% of 81 soil samples from Ghana and 39% of 114 soil samples from Nigeria. Pratylenchus spp. were detected in 24 of 400 tubers examined, in combination with root-knot nematodes (Meloidogyne spp.) and their associated damage of galls and crazy roots (79%), and with yam nematode (Scutellonema bradys) and their associated damage of dry rot (17%), although no specific additional symptoms were observed for Pratylenchus spp. Species of Pratylenchus were identified by their morphological features and by sequences of the D2-D3 region of the 28 S rDNA gene and the mitochondrial cytochrome oxidase I gene (COI). Pratylenchus brachyurus was the most frequent RLN species in both the rhizosphere and tubers of yam. Pratylenchus hexincisus was recovered from one tuber collected in Nigeria. While further investigations are required to establish the host status of yam for this nematode, this appears to be the first record of P. hexincisus on yam. The present taxonomical status of P. scribneri and P. hexincisus is discussed.

Morphological and molecular characterization of <italic>Pratylenchus</italic> species from Yam (<italic>Dioscorea</italic> spp.) in West Africa

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Morphological and molecular characterization of  species from Yam ( spp.) in West Africa

running-head

The root-lesion nematodes (RLN), Pratylenchus spp., are among the major plant-parasitic nematodes affecting yam (Dioscorea spp.) production in West Africa. The...

Morphological and molecular characterization of Pratylenchus species from Yam (Dioscorea spp.) in West Africa

Pubblicato online: 22 gen 2021

Pagine: 1 - 25

DOI: https://doi.org/10.21307/jofnem-2020-126

Parole chiave
COI, D2-D3, Dioscorea, DNA, Ghana, Identification, Molecular, Morphology, Morphometrics, Nigeria, Phylogeny, Pratylenchus, Root-lesion nematodes, Taxonomy, West Africa, Yam

© 2021 Yao A. Kolombia et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Morphological and molecular characterization of Pratylenchus species from Yam (Dioscorea spp.) in West Africa

Pubblicato online: 22 gen 2021

Pagine: 1 - 25

DOI: https://doi.org/10.21307/jofnem-2020-126

Parole chiaveCOI, D2-D3, Dioscorea, DNA, Ghana, Identification, Molecular, Morphology, Morphometrics, Nigeria, Phylogeny, Pratylenchus, Root-lesion nematodes, Taxonomy, West Africa, Yam

© 2021 Yao A. Kolombia et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Parole chiave
COI, D2-D3, Dioscorea, DNA, Ghana, Identification, Molecular, Morphology, Morphometrics, Nigeria, Phylogeny, Pratylenchus, Root-lesion nematodes, Taxonomy, West Africa, Yam