Xylem structure of four grape varieties and 12 alternative hosts to the xylem-limited bacterium Xylella fastidious
Identifieur interne : 001652 ( Main/Merge ); précédent : 001651; suivant : 001653Xylem structure of four grape varieties and 12 alternative hosts to the xylem-limited bacterium Xylella fastidious
Auteurs : David S. Chatelet [États-Unis] ; Christina M. Wistrom [États-Unis] ; Alexander H. Purcell [États-Unis] ; Thomas L. Rost [États-Unis] ; Mark A. Matthews [États-Unis]Source :
- Annals of Botany [ 0305-7364 ] ; 2011.
Abstract
The bacterium
Air and paint were introduced into leaves and stems to examine the connectivity between stem and leaves and the length distribution of their vessels. Leaf petiole and stem anatomies were studied to determine the basis for the free or restricted movement of
There were no obvious differences in stem or petiole vascular anatomy among the grape varieties examined, nor among the other plant species that would explain differences in resistance to
Stem–leaf connectivity via open xylem conduits and vessel length is not responsible for differences in PD tolerance among grape varieties, or for limiting bacterial movement in the tolerant plant species. However, it was found that tolerant host plants had narrower vessels and more parenchyma rays, possibly restricting bacterial movement at the level of the vessels. The implications of xylem structure and connectivity for the means and regulation of bacterial movement are discussed.
Url:
DOI: 10.1093/aob/mcr106
PubMed: 21546428
PubMed Central: 3119617
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PMC:3119617Le document en format XML
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<author><name sortKey="Chatelet, David S" sort="Chatelet, David S" uniqKey="Chatelet D" first="David S." last="Chatelet">David S. Chatelet</name>
<affiliation wicri:level="1"><nlm:aff id="af1"><addr-line>Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02906, USA</addr-line>
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<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02906</wicri:regionArea>
<wicri:noRegion>RI 02906</wicri:noRegion>
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<author><name sortKey="Wistrom, Christina M" sort="Wistrom, Christina M" uniqKey="Wistrom C" first="Christina M." last="Wistrom">Christina M. Wistrom</name>
<affiliation wicri:level="1"><nlm:aff id="af2"><addr-line>Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3114, USA</addr-line>
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<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3114</wicri:regionArea>
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<author><name sortKey="Purcell, Alexander H" sort="Purcell, Alexander H" uniqKey="Purcell A" first="Alexander H." last="Purcell">Alexander H. Purcell</name>
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<author><name sortKey="Rost, Thomas L" sort="Rost, Thomas L" uniqKey="Rost T" first="Thomas L." last="Rost">Thomas L. Rost</name>
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<author><name sortKey="Matthews, Mark A" sort="Matthews, Mark A" uniqKey="Matthews M" first="Mark A." last="Matthews">Mark A. Matthews</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Xylem structure of four grape varieties and 12 alternative hosts to the xylem-limited bacterium <italic>Xylella fastidious</italic>
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<author><name sortKey="Chatelet, David S" sort="Chatelet, David S" uniqKey="Chatelet D" first="David S." last="Chatelet">David S. Chatelet</name>
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<author><name sortKey="Wistrom, Christina M" sort="Wistrom, Christina M" uniqKey="Wistrom C" first="Christina M." last="Wistrom">Christina M. Wistrom</name>
<affiliation wicri:level="1"><nlm:aff id="af2"><addr-line>Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3114, USA</addr-line>
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<author><name sortKey="Purcell, Alexander H" sort="Purcell, Alexander H" uniqKey="Purcell A" first="Alexander H." last="Purcell">Alexander H. Purcell</name>
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<author><name sortKey="Rost, Thomas L" sort="Rost, Thomas L" uniqKey="Rost T" first="Thomas L." last="Rost">Thomas L. Rost</name>
<affiliation wicri:level="1"><nlm:aff id="af3"><addr-line>Department of Plant Biology, University of California, Davis, CA 95616, USA</addr-line>
</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Plant Biology, University of California, Davis, CA 95616</wicri:regionArea>
<wicri:noRegion>CA 95616</wicri:noRegion>
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<author><name sortKey="Matthews, Mark A" sort="Matthews, Mark A" uniqKey="Matthews M" first="Mark A." last="Matthews">Mark A. Matthews</name>
<affiliation wicri:level="1"><nlm:aff id="af4"><addr-line>Department of Viticulture and Enology, University of California, Davis, CA 95616, USA</addr-line>
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<wicri:noRegion>CA 95616</wicri:noRegion>
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<series><title level="j">Annals of Botany</title>
<idno type="ISSN">0305-7364</idno>
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<front><div type="abstract" xml:lang="en"><sec><title>Background and Aims</title>
<p>The bacterium <italic>Xylella fastidiosa</italic>
(<italic>Xf</italic>
), responsible for Pierce's disease (PD) of grapevine, colonizes the xylem conduits of vines, ultimately killing the plant. However, <italic>Vitis vinifera</italic>
grapevine varieties differ in their susceptibility to <italic>Xf</italic>
and numerous other plant species tolerate <italic>Xf</italic>
populations without showing symptoms. The aim of this study was to examine the xylem structure of grapevines with different susceptibilities to <italic>Xf</italic>
infection, as well as the xylem structure of non-grape plant species that support or limit movement of <italic>Xf</italic>
to determine if anatomical differences might explain some of the differences in susceptibility to <italic>Xf</italic>
.</p>
</sec>
<sec><title>Methods</title>
<p>Air and paint were introduced into leaves and stems to examine the connectivity between stem and leaves and the length distribution of their vessels. Leaf petiole and stem anatomies were studied to determine the basis for the free or restricted movement of <italic>Xf</italic>
into the plant.</p>
</sec>
<sec><title>Key Results</title>
<p>There were no obvious differences in stem or petiole vascular anatomy among the grape varieties examined, nor among the other plant species that would explain differences in resistance to <italic>Xf</italic>
. Among grape varieties, the more tolerant ‘Sylvaner’ had smaller stem vessel diameters and 20 % more parenchyma rays than the other three varieties. Alternative hosts supporting <italic>Xf</italic>
movement had slightly longer open xylem conduits within leaves, and more connection between stem and leaves, when compared with alternative hosts that limit <italic>Xf</italic>
movement.</p>
</sec>
<sec><title>Conclusions</title>
<p>Stem–leaf connectivity via open xylem conduits and vessel length is not responsible for differences in PD tolerance among grape varieties, or for limiting bacterial movement in the tolerant plant species. However, it was found that tolerant host plants had narrower vessels and more parenchyma rays, possibly restricting bacterial movement at the level of the vessels. The implications of xylem structure and connectivity for the means and regulation of bacterial movement are discussed.</p>
</sec>
</div>
</front>
</TEI>
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