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    Potato cyst nematodes Globodera rostochiensis and G. pallida

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    Journal Article (1.042Mb)
    Date
    2021-05
    Author
    Price, J.A.
    Coyne, D.
    Blok, V.C.
    Jones, J.T.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Taxonomy Phylum Nematoda; class Chromadorea; order Rhabditida; suborder Tylenchina; infraorder Tylenchomorpha; superfamily Tylenchoidea; family Heteroderidae; subfamily Heteroderinae; Genus Globodera. Biology Potato cyst nematodes (PCN) are biotrophic, sedentary endoparasitic nematodes. Invasive (second) stage juveniles (J2) hatch from eggs in response to the presence of host root exudates and subsequently locate and invade the host. The nematodes induce the formation of a large, multinucleate syncytium in host roots, formed by fusion of up to 300 root cell protoplasts. The nematodes rely on this single syncytium for the nutrients required to develop through a further three moults to the adult male or female stage. This extended period of biotrophy—between 4 and 6 weeks in total—is almost unparalleled in plant–pathogen interactions. Females remain at the root while adult males revert to the vermiform body plan of the J2 and leave the root to locate and fertilize the female nematodes. The female body forms a cyst that contains the next generation of eggs. Host range The host range of PCN is limited to plants of the Solanaceae family. While the most economically important hosts are potato (Solanum tuberosum), tomato (Solanum lycopersicum), and aubergine (Solanum melongena), over 170 species of Solanaceae are thought to be potential hosts for PCN (Sullivan et al., 2007). Disease symptoms Symptoms are similar to those associated with nutrient deficiency, such as stunted growth, yellowing of leaves and reduced yields. This absence of specific symptoms reduces awareness of the disease among growers. Disease control Resistance genes (where available in suitable cultivars), application of nematicides, crop rotation. Great effort is put into reducing the spread of PCN through quarantine measures and use of certified seed stocks. Useful websites Genomic information for PCN is accessible through WormBase ParaSite.
    https://dx.doi.org/10.1111/mpp.13047
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7098
    IITA Authors ORCID
    Daniel Coynehttps://orcid.org/0000-0002-2030-6328
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/mpp.13047
    Research Themes
    Natural Resource Management
    IITA Subjects
    Agronomy; Food Security; Natural Resource Management; Plant Breeding; Plant Diseases; Plant Genetic Resources; Plant Production
    Agrovoc Terms
    Genomes; Globodera; Potatoes; Nematodes; Host Parasite Relations
    Hubs
    Eastern Africa Hub
    Journals
    Molecular Plant Pathology
    Collections
    • Journal and Journal Articles4835
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