Apoplastic and symplastic phloem loading in Quercus robur and Fraxinus excelsior
Identifieur interne : 001614 ( Ncbi/Merge ); précédent : 001613; suivant : 001615Apoplastic and symplastic phloem loading in Quercus robur and Fraxinus excelsior
Auteurs : Soner Öner-Sieben ; Gertrud LohausSource :
- Journal of Experimental Botany [ 0022-0957 ] ; 2014.
Abstract
Concentration gradients of sugars between the cytosol of mesophyll cells and the phloem reveal that
Url:
DOI: 10.1093/jxb/eru066
PubMed: 24591056
PubMed Central: 3978624
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Apoplastic and symplastic phloem loading in <italic>Quercus robur</italic> and <italic>Fraxinus excelsior</italic></title><author><name sortKey="Oner Sieben, Soner" sort="Oner Sieben, Soner" uniqKey="Oner Sieben S" first="Soner" last="Öner-Sieben">Soner Öner-Sieben</name></author><author><name sortKey="Lohaus, Gertrud" sort="Lohaus, Gertrud" uniqKey="Lohaus G" first="Gertrud" last="Lohaus">Gertrud Lohaus</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24591056</idno><idno type="pmc">3978624</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3978624</idno><idno type="RBID">PMC:3978624</idno><idno type="doi">10.1093/jxb/eru066</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">001036</idno><idno type="wicri:Area/Pmc/Curation">001035</idno><idno type="wicri:Area/Pmc/Checkpoint">000901</idno><idno type="wicri:Area/Ncbi/Merge">001614</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Apoplastic and symplastic phloem loading in <italic>Quercus robur</italic> and <italic>Fraxinus excelsior</italic></title><author><name sortKey="Oner Sieben, Soner" sort="Oner Sieben, Soner" uniqKey="Oner Sieben S" first="Soner" last="Öner-Sieben">Soner Öner-Sieben</name></author><author><name sortKey="Lohaus, Gertrud" sort="Lohaus, Gertrud" uniqKey="Lohaus G" first="Gertrud" last="Lohaus">Gertrud Lohaus</name></author></analytic><series><title level="j">Journal of Experimental Botany</title><idno type="ISSN">0022-0957</idno><idno type="eISSN">1460-2431</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Summary</title><p>Concentration gradients of sugars between the cytosol of mesophyll cells and the phloem reveal that <italic>Quercus robur</italic> is probably an apoplastic phloem loader and <italic>Fraxinus excelsior</italic> a mixed phloem loader.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Aoki, N" uniqKey="Aoki N">N Aoki</name></author><author><name sortKey="Hirose, T" uniqKey="Hirose T">T Hirose</name></author><author><name sortKey="Scofield, Gn" uniqKey="Scofield G">GN Scofield</name></author><author><name sortKey="Whitfeld, Pr" uniqKey="Whitfeld P">PR Whitfeld</name></author><author><name sortKey="Furbank, Rt" uniqKey="Furbank R">RT Furbank</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Beebe, Du" uniqKey="Beebe D">DU Beebe</name></author><author><name sortKey="Turgeon, R" uniqKey="Turgeon R">R Turgeon</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chang, S" uniqKey="Chang S">S Chang</name></author><author><name sortKey="Puryear, J" 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H" uniqKey="Ziegler H">H Ziegler</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Exp Bot</journal-id><journal-id journal-id-type="iso-abbrev">J. Exp. Bot</journal-id><journal-id journal-id-type="hwp">jexbot</journal-id><journal-id journal-id-type="publisher-id">exbotj</journal-id><journal-title-group><journal-title>Journal of Experimental Botany</journal-title></journal-title-group><issn pub-type="ppub">0022-0957</issn><issn pub-type="epub">1460-2431</issn><publisher><publisher-name>Oxford University Press</publisher-name><publisher-loc>UK</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24591056</article-id><article-id pub-id-type="pmc">3978624</article-id><article-id pub-id-type="doi">10.1093/jxb/eru066</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Paper</subject></subj-group></article-categories><title-group><article-title>Apoplastic and symplastic phloem loading in <italic>Quercus robur</italic> and <italic>Fraxinus excelsior</italic></article-title></title-group><contrib-group><contrib contrib-type="author" corresp="no"><name><surname>Öner-Sieben</surname><given-names>Soner</given-names></name></contrib><contrib contrib-type="author"><name><surname>Lohaus</surname><given-names>Gertrud</given-names></name><xref ref-type="corresp" rid="c1">*</xref></contrib><aff id="AF0001"><institution>Molekulare Pflanzenforschung/Pflanzenbiochemie, Bergische Universität Wuppertal</institution>,<addr-line>Gaußstraße 20, D-42119 Wuppertal</addr-line>,<country>Germany</country></aff></contrib-group><author-notes><corresp id="c1">* To whom correspondence should be addressed. E-mail: <email>lohaus@uni-wuppertal.de</email></corresp></author-notes><pub-date pub-type="ppub"><month>4</month><year>2014</year></pub-date><pub-date pub-type="epub"><day>3</day><month>3</month><year>2014</year></pub-date><pub-date pub-type="pmc-release"><day>3</day><month>3</month><year>2014</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>65</volume><issue>7</issue><issue-title>Plant Vascular Trafficking</issue-title><fpage>1905</fpage><lpage>1916</lpage><permissions><copyright-statement>© The Author 2014. Published by Oxford University Press on behalf of the Society for Experimental Biology.</copyright-statement><copyright-year>2014</copyright-year><license license-type="creative-commons" xlink:href="http://creativecommons.org/licenses/by/3.0"><license-p><pmc-comment>CREATIVE COMMONS</pmc-comment>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/3.0/">http://creativecommons.org/licenses/by/3.0/</ext-link>), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract abstract-type="precis"><title>Summary</title><p>Concentration gradients of sugars between the cytosol of mesophyll cells and the phloem reveal that <italic>Quercus robur</italic> is probably an apoplastic phloem loader and <italic>Fraxinus excelsior</italic> a mixed phloem loader.</p></abstract><abstract><p>Whereas most of the research on phloem loading is performed on herbaceous plants, less is known about phloem loading strategies in trees. In this study, the phloem loading mechanisms of <italic>Quercus robur</italic> and <italic>Fraxinus excelsior</italic> were analysed. The following features were examined: the minor vein structure, the sugar concentrations in phloem sap by the laser–aphid–stylet technique, the distribution of photoassimilates in the mesophyll cells by non-aqueous fractionation, gradients of sugar concentrations and osmotic pressure, and the expression of sucrose transporters. The minor vein configurations of <italic>Q. robur</italic> and <italic>F. excelsior</italic> belong to the open type. <italic>Quercus robur</italic> contained companion cells in the minor veins whereas <italic>F. excelsior</italic> showed intermediary cells in addition to ordinary companion cells. The main carbon transport form in <italic>Q. robur</italic> was sucrose (~1M). In <italic>F. excelsior</italic> high amounts of raffinose and stachyose were also transported. However, in both tree species, the osmolality of phloem sap was higher than the osmolality of the mesophyll cells. The concentration gradients between phloem sap and the cytoplasm of mesophyll cells for sucrose were 16-fold and 14-fold for <italic>Q. robur</italic> and <italic>F. excelsior</italic>, respectively. Independent of the type of translocated sugars, sucrose transporter cDNAs were cloned from both species. The results indicate that phloem loading of sucrose and other metabolites must involve active loading steps in both tree species. <italic>Quercus robur</italic> seems to be an apoplastic phloem loader while <italic>F. excelsior</italic> shows indications of being a symplastic or mixed symplastic–apoplastic phloem loader.</p></abstract><kwd-group><title>Key words:</title><kwd><italic>Fraxinus excelsior</italic></kwd><kwd>non-aqueous fractionation</kwd><kwd>phloem loading</kwd><kwd><italic>Quercus robur</italic></kwd><kwd>subcellular metabolite concentration</kwd><kwd>sucrose transporter</kwd><kwd>sugar.</kwd></kwd-group><counts><page-count count="12"></page-count></counts></article-meta></front></pmc><affiliations><list></list><tree><noCountry><name sortKey="Lohaus, Gertrud" sort="Lohaus, Gertrud" uniqKey="Lohaus G" first="Gertrud" last="Lohaus">Gertrud Lohaus</name><name sortKey="Oner Sieben, Soner" sort="Oner Sieben, Soner" uniqKey="Oner Sieben S" first="Soner" last="Öner-Sieben">Soner Öner-Sieben</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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