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    Genome wide association analysis of a stemborer egg induced “call‑for‑help” defence trait in maize

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    Journal Article (3.102Mb)
    Date
    2020
    Author
    Tamiru, A.
    Paliwal, R.
    Manthi, S.J.
    Odeny, D.A.
    Midega, C.A.
    Khan, Z.R.
    Pickett, J.A.
    Bruce, T.J.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Tritrophic interactions allow plants to recruit natural enemies for protection against herbivory. Here we investigated genetic variability in induced responses to stemborer egg-laying in maize Zea mays (L.) (Poaceae). We conducted a genome wide association study (GWAS) of 146 maize genotypes comprising of landraces, inbred lines and commercial hybrids. Plants were phenotyped in bioassays measuring parasitic wasp Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae) attraction to volatiles collected from plants exposed to stemborer Chilo partellus (Swinhoe) (Lepidoptera: Crambidae) eggs. Genotyping-by-sequencing was used to generate maize germplasm SNP data for GWAS. The egg-induced parasitoid attraction trait was more common in landraces than in improved inbred lines and hybrids. GWAS identified 101 marker-trait associations (MTAs), some of which were adjacent to genes involved in the JA-defence pathway (opr7, aos1, 2, 3), terpene biosynthesis (fps3, tps2, 3, 4, 5, 7, 9, 10), benzoxazinone synthesis (bx7, 9) and known resistance genes (e.g. maize insect resistance 1, mir1). Intriguingly, there was also association with a transmembrane protein kinase that may function as a receptor for the egg elicitor and other genes implicated in early plant defence signalling. We report maize genomic regions associated with indirect defence and provide a valuable resource for future studies of tritrophic interactions in maize. The markers identified may facilitate selection of indirect defence by maize breeders.
    https://dx.doi.org/10.1038/s41598-020-68075-2
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7129
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1038/s41598-020-68075-2
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Disease Control; Food Security; Maize; Pests of Plants
    Agrovoc Terms
    Maize; Zea Mays; Stem Eating Insects; Genotypes; Pests of Plants; Stem Borers
    Regions
    Africa; East Africa
    Countries
    Kenya
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Scientific Reports
    Collections
    • Journal and Journal Articles4836
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