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    Development of three fusarium crown rot causal agents and systemic translocation of deoxynivalenol following stem base infection of soft wheat

    Access Status
    Fulltext not available
    Authors
    Beccari, G.
    Prodi, A.
    Pisi, A.
    Nipoti, P.
    Onofri, A.
    Nicholson, P.
    Pfohl, K.
    Karlovsky, P.
    Gardiner, D.
    Covarelli, Lorenzo
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Beccari, G. and Prodi, A. and Pisi, A. and Nipoti, P. and Onofri, A. and Nicholson, P. and Pfohl, K. et al. 2018. Development of three fusarium crown rot causal agents and systemic translocation of deoxynivalenol following stem base infection of soft wheat. Plant Pathology. 67 (5): pp. 1055-1065.
    Source Title
    Plant Pathology
    DOI
    10.1111/ppa.12821
    ISSN
    0032-0862
    School
    Centre for Crop and Disease Management (CCDM)
    URI
    http://hdl.handle.net/20.500.11937/67385
    Collection
    • Curtin Research Publications
    Abstract

    Fusarium pseudograminearum, F. culmorum and F. graminearum are the most important fusarium crown rot (FCR) causal agents. They have the common ability to biosynthesize deoxynivalenol (DON). To elucidate the behaviour of each of the three species, a comparative study was carried out to investigate symptom progression, fungal systemic growth and translocation of DON following stem base inoculation of soft wheat. FCR symptoms were mainly localized in the inoculated area, which extended up to the second node for all inoculated species. Only the most aggressive strains caused symptoms up to the third node. Real-time quantitative PCR showed that fungal colonization reached the third node for all the tested species, but a low percentage of plants showed colonization above the third node following inoculation with the most aggressive strains. Fungal growth was detected in symptomless tissues but none of the three species was able to colonize as far as the head tissues. However, even if the pathogens were not detected in the heads, DON was detected in head tissues of the plants inoculated with the most aggressive strains. These results demonstrate that F. pseudograminearum, F. culmorum and F. graminearum, under the same experimental conditions, follow a similar pattern of symptom progression, fungal colonization and DON translocation after stem base infection. Differences in the extent of symptoms, fungal colonization and mycotoxin distribution were mainly attributable to strain aggressiveness. These findings provide comparative information on the events following infection of the stem base of wheat by three of the most important FCR casual agents.

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