Morphological and molecular characterization of Pratylenchus species from Yam (Dioscorea spp.) in West Africa
| Autor: | Emmanuel Olajide, Nicole Viaene, Wim Bert, P. Lava Kumar, Oluwadamilola Ogundero, Yao Kolombia, Danny Coyne |
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| Rok vydání: | 2020 |
| Předmět: |
Morphology
Identification D2-D3 Pratylenchus brachyurus Nigeria COFFEAE Ghana DISEASE COI SCUTELLONEMA-BRADYS West Africa lcsh:QH301-705.5 Phylogeny Taxonomy Root-lesion nematodes Rhizosphere biology Dioscorea Arts & Humanities Biology and Life Sciences BRACHYURUS food and beverages Molecular DNA FRAMEWORK biology.organism_classification PREVALENCE Horticulture Nematode lcsh:Biology (General) meteorology.tropical_cyclone Pratylenchus Pratylenchus hexincisus Scutellonema bradys meteorology N. SP NEMATODA Yam Dry rot Morphometrics Agronomy and Crop Science |
| Zdroj: | Journal of Nematology JOURNAL OF NEMATOLOGY Journal of Nematology, Vol 52, Iss i_current (2020) |
| ISSN: | 2640-396X 0022-300X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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