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    Shedding light on the role of photosynthesis in pathogen colonization and host defense

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    Type
    Article
    Authors
    Garavaglia, Betiana S.
    Thomas, Ludivine
    Gottig, Natalia
    Zimaro, Tamara
    Garofalo, Cecilia G.
    Gehring, Christoph A cc
    Ottado, Jorgelina
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Computational Bioscience Research Center (CBRC)
    Date
    2014-10-31
    Online Publication Date
    2014-10-31
    Print Publication Date
    2010-07
    Permanent link to this record
    http://hdl.handle.net/10754/622832
    
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    Abstract
    The role of photosynthesis in plant defense is a fundamental question awaiting further molecular and physiological elucidation. To this end we investigated host responses to infection with the bacterial pathogen Xanthomonas axonopodis pv. citri, the pathogen responsible for citrus canker. This pathogen encodes a plant-like natriuretic peptide (XacPNP) that is expressed specifically during the infection process and prevents deterioration of the physiological condition of the infected tissue. Proteomic assays of citrus leaves infected with a XacPNP deletion mutant (DeltaXacPNP) resulted in a major reduction in photosynthetic proteins such as Rubisco, Rubisco activase and ATP synthase as a compared with infection with wild type bacteria. In contrast, infiltration of citrus leaves with recombinant XacPNP caused an increase in these host proteins and a concomitant increase in photosynthetic efficiency as measured by chlorophyll fluorescence assays. Reversion of the reduction in photosynthetic efficiency in citrus leaves infected with DeltaXacPNP was achieved by the application of XacPNP or Citrus sinensis PNP lending support to a case of molecular mimicry. Finally, given that DeltaXacPNP infection is less successful than infection with the wild type, it appears that reducing photosynthesis is an effective plant defense mechanism against biotrophic pathogens.
    Citation
    Garavaglia BS, Thomas L, Gottig N, Zimaro T, Garofalo CG, et al. (2010) Shedding light on the role of photosynthesis in pathogen colonization and host defense. Communicative & Integrative Biology 3: 382–384. Available: http://dx.doi.org/10.4161/cib.3.4.12029.
    Publisher
    Informa UK Limited
    Journal
    Communicative & Integrative Biology
    DOI
    10.4161/cib.3.4.12029
    PubMed ID
    20798833
    Additional Links
    http://www.tandfonline.com/action/showCopyRight?scroll=top&doi=10.4161%2Fcib.3.4.12029
    ae974a485f413a2113503eed53cd6c53
    10.4161/cib.3.4.12029
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Computational Bioscience Research Center (CBRC)

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