Shedding light on the role of photosynthesis in pathogen colonization and host defense
Identifieur interne : 001A00 ( Main/Exploration ); précédent : 001999; suivant : 001A01Shedding light on the role of photosynthesis in pathogen colonization and host defense
Auteurs : Betiana S. Garavaglia [Argentine] ; Ludivine Thomas [Afrique du Sud] ; Natalia Gottig [Argentine] ; Tamara Zimaro [Argentine] ; Cecilia G. Garofalo [Afrique du Sud] ; Chris Gehring ; Jorgelina Ottado [Argentine]Source :
- Communicative & Integrative Biology [ 1942-0889 ] ; 2010.
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
Url:
PubMed: 20798833
PubMed Central: 2928325
Affiliations:
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<author><name sortKey="Thomas, Ludivine" sort="Thomas, Ludivine" uniqKey="Thomas L" first="Ludivine" last="Thomas">Ludivine Thomas</name>
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<affiliation><nlm:aff id="A4"> CBRC; 4700 King Abdullah University of Science and Technology; Thuwal, Kingdom of Saudi Arabia</nlm:aff>
<wicri:noCountry code="subfield">Kingdom of Saudi Arabia</wicri:noCountry>
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<author><name sortKey="Ottado, Jorgelina" sort="Ottado, Jorgelina" uniqKey="Ottado J" first="Jorgelina" last="Ottado">Jorgelina Ottado</name>
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<series><title level="j">Communicative & Integrative Biology</title>
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<front><div type="abstract" xml:lang="en"><p>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 <italic>Xanthomonas axonopodis</italic>
pv. <italic>citri</italic>
, 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 <italic>XacPNP</italic>
deletion mutant (ΔXacPNP) 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 ΔXacPNP was achieved by the application of XacPNP or <italic>Citrus sinensis</italic>
PNP lending support to a case of molecular mimicry. Finally, given that ΔXacPNP infection is less successful than infection with the wild type, it appears that reducing photosynthesis is an effective plant defense mechanism against biotrophic pathogens.</p>
</div>
</front>
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<affiliations><list><country><li>Afrique du Sud</li>
<li>Argentine</li>
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<tree><noCountry><name sortKey="Gehring, Chris" sort="Gehring, Chris" uniqKey="Gehring C" first="Chris" last="Gehring">Chris Gehring</name>
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<country name="Argentine"><noRegion><name sortKey="Garavaglia, Betiana S" sort="Garavaglia, Betiana S" uniqKey="Garavaglia B" first="Betiana S" last="Garavaglia">Betiana S. Garavaglia</name>
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<name sortKey="Garavaglia, Betiana S" sort="Garavaglia, Betiana S" uniqKey="Garavaglia B" first="Betiana S" last="Garavaglia">Betiana S. Garavaglia</name>
<name sortKey="Gottig, Natalia" sort="Gottig, Natalia" uniqKey="Gottig N" first="Natalia" last="Gottig">Natalia Gottig</name>
<name sortKey="Ottado, Jorgelina" sort="Ottado, Jorgelina" uniqKey="Ottado J" first="Jorgelina" last="Ottado">Jorgelina Ottado</name>
<name sortKey="Zimaro, Tamara" sort="Zimaro, Tamara" uniqKey="Zimaro T" first="Tamara" last="Zimaro">Tamara Zimaro</name>
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<name sortKey="Garofalo, Cecilia G" sort="Garofalo, Cecilia G" uniqKey="Garofalo C" first="Cecilia G" last="Garofalo">Cecilia G. Garofalo</name>
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