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    Parasitic nematode Meloidogyne incognita interactions with different Capsicum annum cultivars reveal the chemical constituents modulating root herbivory

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    U17ArtKihikaParasiticInthomDev.pdf (3.193Mb)
    Date
    2017
    Author
    Kihika, R.
    Murungi, L.K.
    Coyne, D.L.
    Ng'ang'a, M.
    Hassanali, A.
    Teal, P.E.A.
    Torto, B.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Plant volatile signatures are often used as cues by herbivores to locate their preferred hosts. Here, we report on the volatile organic compounds used by the subterranean root-knot nematode (RKN) Meloidogyne incognita for host location. We compared responses of infective second stage juveniles (J2s) to root volatiles of three cultivars and one accession of the solanaceous plant, Capsicum annum against moist sand in dual choice assays. J2s were more attracted to the three cultivars than to the accession, relative to controls. GC/MS analysis of the volatiles identified common constituents in each plant, five of which were identified as α-pinene, limonene, 2-methoxy-3-(1-methylpropyl)-pyrazine, methyl salicylate and tridecane. We additionally identified thymol as being specific to the accession. In dose-response assays, a blend of the five components elicited positive chemotaxis (71–88%), whereas individual components elicited varying responses; Methyl salicylate (MeSA) elicited the highest positive chemotaxis (70–80%), α-pinene, limonene and tridecane were intermediate (54–60%), and 2-methoxy- 3-(1-methylpropyl)-pyrazine the lowest (49–55%). In contrast, thymol alone or thymol combined with either the preferred natural plant root volatiles or the five-component synthetic blend induced negative chemotaxis. Our results provide insights into RKN-host plant interactions, creating new opportunities for plant breeding programmes towards management of RKNs.
    http://dx.doi.org/10.1038/s41598-017-02379-8
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1889
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1038/s41598-017-02379-8
    IITA Subjects
    Pests Of Plants; Plant Diseases; Plant Ecology
    Agrovoc Terms
    Nematode; Meloidogyne Incognita; Limonene; Root-Knot Nematode; Cultivars; Capsicum Annum; Root Herbivory; Root Volatiles; Plant Hosts
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