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    Polar growth in the infectious hyphae of the phytopathogen ustilago maydis depends on a virulence-specific cyclin

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    Authors
    Flor-Parra, Ignacio
    Castillo-Lluva, Sonia
    Pérez-Simón, José A
    Affiliation
    Departamento de Biotecnología Microbiana, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
    Issue Date
    2007-10
    
    Metadata
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    Abstract
    The maize smut fungus Ustilago maydis switches from yeast to hyphal growth to infect maize (Zea mays) plants. This switching is promoted by mating of compatible cells and seems to be required for plant penetration. Although many genes distinctively expressed during this dimorphic switch have been identified and shown to be essential for the infection process, none seems to be explicitly required for polar growth control. Here, we report the characterization of pcl12, encoding a cyclin that interacts specifically with Cdk5, an essential cyclin-dependent kinase with regulatory roles in morphogenesis in U. maydis. Pcl12 fulfills the requirements to be a virulence-specific regulator of polar growth in U. maydis. First, pcl12 expression is induced during the pathogenic development. Secondly, Pcl12 is sufficient to induce hyperpolarized growth in U. maydis cells, as haploid cells overexpressing pcl12 in axenic conditions produce filaments that were morphologically indistinguishable from those produced during the infection process. Finally, cells defective in pcl12 showed impaired polar growth during the formation of the b-dependent filament, the induction of the conjugation tubes, or the formation of a promycelium in spore germination. However, in spite of this pivotal role during morphogenesis, pcl12 mutants were virulent. We discuss the implications of these results for the role of polar growth during the infection process.
    Citation
    Polar growth in the infectious hyphae of the phytopathogen ustilago maydis depends on a virulence-specific cyclin. 2007, 19 (10):3280-96 Plant Cell
    Journal
    The Plant Cell
    URI
    http://hdl.handle.net/10541/72846
    DOI
    10.1105/tpc.107.052738
    PubMed ID
    17921314
    Type
    Article
    Language
    en
    ISSN
    1040-4651
    ae974a485f413a2113503eed53cd6c53
    10.1105/tpc.107.052738
    Scopus Count
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    All Paterson Institute for Cancer Research

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