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    When do arbuscular mycorrhizal fungi protect plant roots from pathogens?

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    Sike_2010.pdf (187.8Kb)
    Issue Date
    2010-03-10
    Author
    Sikes, Benjamin A.
    Publisher
    Taylor & Francis
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
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    Abstract
    Arbuscular mycorrhizal (AM) fungi are mainly thought to facilitate phosphorus uptake in plants, but they can also perform several other functions that are equally beneficial. Our recent study sheds light on the factors determining one such function, enhanced plant protection from root pathogens. Root infection by the fungal pathogen Fusarium oxysporum was determined by both plant susceptibility and the ability of an AM fungal partner to suppress the pathogen. The non-susceptible plant species (Allium cepa) had limited F. oxysporum infection even without AM fungi. In contrast, the susceptible plant species (Setaria glauca) was heavily infected and only AM fungi in the family Glomeraceae limited pathogen abundance. Plant susceptibility to pathogens was likely determined by contrasting root architectures between plants, with the simple rooted plant (A. cepa) presenting fewer sites for infection.AM fungal colonization, however, was not limited in the same way in part because plants with fewer, simple roots are more mycorrhizal dependent. Protection only by Glomus species also indicates that whatever the mechanism(s) of this function, it responds to AM fungal families differently. While poor at pathogen protection, AM fungal species in the family Gigasporaceae most benefited the growth of the simple rooted plant species. Our research indicates that plant trait differences, such as root architecture can determine how important each mycorrhizal function is to plant growth but the ability to provide these functions differs among AM fungi.
    Description
    This is an Accepted Manuscript of an article published by Taylor & Francis in Plant Signaling and Behavior on March 10, 2010, available online: http://www.tandfonline.com/10.4161/psb.5.6.11776.
    URI
    http://hdl.handle.net/1808/18842
    DOI
    https://doi.org/10.4161/psb.5.6.11776
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    BA Sikes. (2010) When do arbuscular mycorrhizas protect plant roots from pathogens? Plant Signaling and Behavior 5(6): 763-765. http://dx.doi.org/10.4161/psb.5.6.11776

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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