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    Analysis of microbial taxonomical groups present in maize stalks suppressive to colonization by toxigenic Fusarium spp.: a strategy for the identification of potential antagonists

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    Date
    2015
    Author
    Köhl, J.
    Lombaers, C.
    Moretti, A.
    Bandyopadhyay, Ranajit
    Somma, S.
    Kastelein, P.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Pink ear rot of maize caused by Fusarium verticillioides, Fusarium proliferatum and Fusarium graminearum can lead to severe yield losses and contamination of grain with a range of mycotoxins. Maize stalks colonized by Fusarium spp. are the main primary inoculum source for Fusarium incited epidemics in maize or other susceptible crops grown in rotation. The colonization of individual maize stalks originating from fields in The Netherlands, Italy and Nigeria by Fusarium spp. was quantified using specific TaqMan-PCR assays. Highest values were found for F. graminearum and Fusarium avenaceum in Dutch samples, for F. graminearum and FUM producing species (F. verticillioides and F. proliferatum) in Italian samples and FUM producing Fusarium spp. in Nigerian samples. The increase in Fusarium spp. colonization under field conditions during a period of 3–6 months after harvest of the maize crops varied considerably between individual stalks. The fungal and bacterial diversity was analyzed for sub-sets of stalks with high versus low increase of Fusarium colonization. Bacterial taxonomic groups such as Bacillus, Curtobacterium, Erwinia, Flavobacterium, Novosphingobium, Pantoea, Sphingomonas, Rahnella and Staphylococcus and fungal taxonomic groups such as Acremomium sp., Cryptococcus flavescens, Cryptococcus zeae, Leptosphaeria sp. and Microdochium bolleyi were more abundant in the stalks with lower increase in pathogen colonization. Such fungal and bacterial groups associated with ‘suppressive stalks’ may be antagonistic to Fusarium spp. and a source of candidate strains for the selection of new biological control agents.Pink ear rot of maize caused by Fusarium verticillioides, Fusarium proliferatum and Fusarium graminearum can lead to severe yield losses and contamination of grain with a range of mycotoxins. Maize stalks colonized by Fusarium spp. are the main primary inoculum source for Fusarium incited epidemics in maize or other susceptible crops grown in rotation. The colonization of individual maize stalks originating from fields in The Netherlands, Italy and Nigeria by Fusarium spp. was quantified using specific TaqMan-PCR assays. Highest values were found for F. graminearum and Fusarium avenaceum in Dutch samples, for F. graminearum and FUM producing species (F. verticillioides and F. proliferatum) in Italian samples and FUM producing Fusarium spp. in Nigerian samples. The increase in Fusarium spp. colonization under field conditions during a period of 3–6 months after harvest of the maize crops varied considerably between individual stalks. The fungal and bacterial diversity was analyzed for sub-sets of stalks with high versus low increase of Fusarium colonization. Bacterial taxonomic groups such as Bacillus, Curtobacterium, Erwinia, Flavobacterium, Novosphingobium, Pantoea, Sphingomonas, Rahnella and Staphylococcus and fungal taxonomic groups such as Acremomium sp., Cryptococcus flavescens, Cryptococcus zeae, Leptosphaeria sp. and Microdochium bolleyi were more abundant in the stalks with lower increase in pathogen colonization. Such fungal and bacterial groups associated with ‘suppressive stalks’ may be antagonistic to Fusarium spp. and a source of candidate strains for the selection of new biological control agents.
    https://dx.doi.org/10.1016/j.biocontrol.2014.12.007
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/876
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.biocontrol.2014.12.007
    IITA Subjects
    Maize
    Agrovoc Terms
    Crop Residues; Biological Control; Maize; Fusarium
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Biological Control
    Collections
    • Journal and Journal Articles4835
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