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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Carbon Cost of the Fungal Symbiont Relative to Net Leaf P Accumulation in a Split-Root VA Mycorrhizal Symbiosis <xref ref-type="fn" rid="fn1"><sup>1</sup></xref></title><author><name sortKey="Douds, David D" sort="Douds, David D" uniqKey="Douds D" first="David D." last="Douds">David D. Douds</name></author><author><name sortKey="Johnson, Charles R" sort="Johnson, Charles R" uniqKey="Johnson C" first="Charles R." last="Johnson">Charles R. Johnson</name></author><author><name sortKey="Koch, Karen E" sort="Koch, Karen E" uniqKey="Koch K" first="Karen E." last="Koch">Karen E. Koch</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">16665934</idno><idno type="pmc">1054511</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1054511</idno><idno type="RBID">PMC:1054511</idno><date when="1988">1988</date><idno type="wicri:Area/Pmc/Corpus">000908</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Carbon Cost of the Fungal Symbiont Relative to Net Leaf P Accumulation in a Split-Root VA Mycorrhizal Symbiosis <xref ref-type="fn" rid="fn1"><sup>1</sup></xref></title><author><name sortKey="Douds, David D" sort="Douds, David D" uniqKey="Douds D" first="David D." last="Douds">David D. Douds</name></author><author><name sortKey="Johnson, Charles R" sort="Johnson, Charles R" uniqKey="Johnson C" first="Charles R." last="Johnson">Charles R. Johnson</name></author><author><name sortKey="Koch, Karen E" sort="Koch, Karen E" uniqKey="Koch K" first="Karen E." last="Koch">Karen E. Koch</name></author></analytic><series><title level="j">Plant Physiology</title><idno type="ISSN">0032-0889</idno><idno type="eISSN">1532-2548</idno><imprint><date when="1988">1988</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Translocation of <sup>14</sup>C-photosynthates to mycorrhizal (+ +), half mycorrhizal (0+), and nonmycorrhizal (00) split-root systems was compared to P accumulation in leaves of the host plant. Carrizo citrange seedlings (<italic>Poncirus trifoliata</italic> [L.] Raf. × <italic>Citrus sinensis</italic> [L.] Osbeck) were inoculated with the vesicular-arbuscular mycorrhizal fungus <italic>Glomus intraradices</italic> Schenck and Smith. Plants were exposed to <sup>14</sup> CO<sub>2</sub> for 10 minutes and ambient air for 2 hours. Three to 4% of recently labeled photosynthate was allocated to metabolism of the mycorrhiza in each inoculated root half independent of shoot P concentration, growth response, and whether one or both root halves were colonized. Nonmycorrhizal roots respired more of the label translocated to them than did mycorrhizal roots. Label recovered in the potting medium due to exudation or transport into extraradical hyphae was 5 to 6 times greater for (+ +) <italic>versus</italic> (00) plants. In low nutrient media, roots of (0+) and (+ +) plants transported more P to leaves per root weight than roots of (00) plants. However, when C translocated to roots utilized for respiration, exudation, etc., as well as growth is considered, (00) plant roots were at least as efficient at P uptake (benefit) per C utilized (cost) as (0+) and (+ +) plants. Root systems of (+ +) plants did not supply more P to leaves than (0+) plants in higher nutrient media, yet they still allocated twice the <sup>14</sup>C-photosynthate to the mycorrhiza as did (0+) root systems. This indicates there is an optimal level of mycorrhizal colonization above which the plant receives no enhanced P uptake yet continues to partition photosynthates to metabolism of the mycorrhiza.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Plant Physiol</journal-id><journal-title>Plant Physiology</journal-title><issn pub-type="ppub">0032-0889</issn><issn pub-type="epub">1532-2548</issn></journal-meta><article-meta><article-id pub-id-type="pmid">16665934</article-id><article-id pub-id-type="pmc">1054511</article-id><article-categories><subj-group subj-group-type="heading"><subject>Microbe-Plant Interactions</subject></subj-group></article-categories><title-group><article-title>Carbon Cost of the Fungal Symbiont Relative to Net Leaf P Accumulation in a Split-Root VA Mycorrhizal Symbiosis <xref ref-type="fn" rid="fn1"><sup>1</sup></xref></article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Douds</surname><given-names>David D.</given-names><suffix>Jr.</suffix></name><xref ref-type="author-notes" rid="au1">2</xref></contrib><contrib contrib-type="author"><name><surname>Johnson</surname><given-names>Charles R.</given-names></name><xref ref-type="author-notes" rid="au2">3</xref></contrib><contrib contrib-type="author"><name><surname>Koch</surname><given-names>Karen E.</given-names></name></contrib></contrib-group><aff id="af1">Fruit Crops Department, University of Florida, Gainesville, Florida 32611</aff><aff id="af2">Ornamental Horticulture Department, University of Florida, Gainesville, Florida 32611</aff><author-notes><fn id="au1"><label>2</label><p> Present address: Plant Pathology Department; University of Florida, Gainesville, FL 32611.</p></fn><fn id="au2"><label>3</label><p> Present address: Department of Horticulture, University of Georgia, Experiment, GA 30212.</p></fn><fn id="fn1"><label>1</label><p> This research was funded by USDA-CRGO grant 84-CRCR-1-1-473, and the Florida Institute of Food and Agricultural Sciences; University of Florida Journal Series No. 8609.</p></fn></author-notes><pub-date pub-type="ppub"><month>02</month><year>1988</year></pub-date><volume>86</volume><issue>2</issue><fpage>491</fpage><lpage>496</lpage><abstract><p>Translocation of <sup>14</sup>C-photosynthates to mycorrhizal (+ +), half mycorrhizal (0+), and nonmycorrhizal (00) split-root systems was compared to P accumulation in leaves of the host plant. Carrizo citrange seedlings (<italic>Poncirus trifoliata</italic> [L.] Raf. × <italic>Citrus sinensis</italic> [L.] Osbeck) were inoculated with the vesicular-arbuscular mycorrhizal fungus <italic>Glomus intraradices</italic> Schenck and Smith. Plants were exposed to <sup>14</sup> CO<sub>2</sub> for 10 minutes and ambient air for 2 hours. Three to 4% of recently labeled photosynthate was allocated to metabolism of the mycorrhiza in each inoculated root half independent of shoot P concentration, growth response, and whether one or both root halves were colonized. Nonmycorrhizal roots respired more of the label translocated to them than did mycorrhizal roots. Label recovered in the potting medium due to exudation or transport into extraradical hyphae was 5 to 6 times greater for (+ +) <italic>versus</italic> (00) plants. In low nutrient media, roots of (0+) and (+ +) plants transported more P to leaves per root weight than roots of (00) plants. However, when C translocated to roots utilized for respiration, exudation, etc., as well as growth is considered, (00) plant roots were at least as efficient at P uptake (benefit) per C utilized (cost) as (0+) and (+ +) plants. Root systems of (+ +) plants did not supply more P to leaves than (0+) plants in higher nutrient media, yet they still allocated twice the <sup>14</sup>C-photosynthate to the mycorrhiza as did (0+) root systems. This indicates there is an optimal level of mycorrhizal colonization above which the plant receives no enhanced P uptake yet continues to partition photosynthates to metabolism of the mycorrhiza.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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