Uptake and transfer of nutrients in ectomycorrhizal associations: interactions between photosynthesis and phosphate nutrition.
Identifieur interne : 003955 ( Main/Corpus ); précédent : 003954; suivant : 003956Uptake and transfer of nutrients in ectomycorrhizal associations: interactions between photosynthesis and phosphate nutrition.
Auteurs : H. Bücking ; W. HeyserSource :
- Mycorrhiza [ 0940-6360 ] ; 2003.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Phosphates.
- microbiology : Pinus, Plant Roots.
- physiology : Basidiomycota, Mycorrhizae, Photosynthesis, Pinus, Plant Roots.
- Light.
Abstract
Energy-dispersive X-ray microanalytical investigations and microautoradiographic studies were carried out to examine whether the uptake and transfer of phosphate (P) by an ectomycorrhizal fungus is affected by the carbohydrate supply of its host plant. For this purpose, non-mycorrhizal seedlings of Pinus sylvestris L. and plants inoculated with the ectomycorrhizal basidiomycete Suillus bovinus (L. ex Fr.) Kuntze were placed in the dark for 7 days in advance of a P supply. The subcellular element distribution and the uptake and distribution of (33)P was analyzed in non-mycorrhizal and mycorrhizal roots of these plants and compared with plants kept constantly under normal light conditions (control plants). The results show that placing non-mycorrhizal plants in the dark in advance of the nutrient supply led to (1) a reduction of the subcellular contents of P, S and K, but to an increase in the cytoplasmic Na content, and (2) an increase of (33)P absorption and translocation to the shoot. It can be assumed that this increased inflow of (33)P in non-mycorrhizal plants was due to P starvation after suppressed photosynthesis and reduced respiration of these plants. The suppression of photosynthesis by an ectomycorrhizal host plant and the resulting lower carbohydrate supply conditions for the ectomycorrhizal fungus led to (1) a decrease of P absorption by the mycobiont, (2) a change of the P allocation in the fungal cell compartments of an ectomycorrhizal root, and (3) a reduction of P transfer to the host plant. However, microautoradiographic studies revealed that, under these conditions, P was also absorbed by the mycorrhizal fungus and translocated via the Hartig net to the host plant. In mycorrhizal roots of plants placed in the dark in advance of the nutrient supply, the cytoplasmic P content of the Hartig net was reduced and, instead, a high number of polyphosphate granules could be detected within the hyphae. The results indicate that the exchange processes between the symbionts in a mycorrhiza are possibly linked and that P uptake and translocation by an ectomycorrhizal fungus is also regulated by the carbohydrate supply of its host plant.
DOI: 10.1007/s00572-002-0196-3
PubMed: 12682827
Links to Exploration step
pubmed:12682827Le document en format XML
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Heyser</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2003">2003</date><idno type="RBID">pubmed:12682827</idno><idno type="pmid">12682827</idno><idno type="doi">10.1007/s00572-002-0196-3</idno><idno type="wicri:Area/Main/Corpus">003955</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">003955</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Uptake and transfer of nutrients in ectomycorrhizal associations: interactions between photosynthesis and phosphate nutrition.</title><author><name sortKey="Bucking, H" sort="Bucking, H" uniqKey="Bucking H" first="H" last="Bücking">H. Bücking</name><affiliation><nlm:affiliation>University of Bremen, Center for Environmental Research and Technology, Leobenerstrasse, 28359 Bremen, Germany. heibueck@uft.uni-bremen.de</nlm:affiliation></affiliation></author><author><name sortKey="Heyser, W" sort="Heyser, W" uniqKey="Heyser W" first="W" last="Heyser">W. 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For this purpose, non-mycorrhizal seedlings of Pinus sylvestris L. and plants inoculated with the ectomycorrhizal basidiomycete Suillus bovinus (L. ex Fr.) Kuntze were placed in the dark for 7 days in advance of a P supply. The subcellular element distribution and the uptake and distribution of (33)P was analyzed in non-mycorrhizal and mycorrhizal roots of these plants and compared with plants kept constantly under normal light conditions (control plants). The results show that placing non-mycorrhizal plants in the dark in advance of the nutrient supply led to (1) a reduction of the subcellular contents of P, S and K, but to an increase in the cytoplasmic Na content, and (2) an increase of (33)P absorption and translocation to the shoot. It can be assumed that this increased inflow of (33)P in non-mycorrhizal plants was due to P starvation after suppressed photosynthesis and reduced respiration of these plants. The suppression of photosynthesis by an ectomycorrhizal host plant and the resulting lower carbohydrate supply conditions for the ectomycorrhizal fungus led to (1) a decrease of P absorption by the mycobiont, (2) a change of the P allocation in the fungal cell compartments of an ectomycorrhizal root, and (3) a reduction of P transfer to the host plant. However, microautoradiographic studies revealed that, under these conditions, P was also absorbed by the mycorrhizal fungus and translocated via the Hartig net to the host plant. In mycorrhizal roots of plants placed in the dark in advance of the nutrient supply, the cytoplasmic P content of the Hartig net was reduced and, instead, a high number of polyphosphate granules could be detected within the hyphae. The results indicate that the exchange processes between the symbionts in a mycorrhiza are possibly linked and that P uptake and translocation by an ectomycorrhizal fungus is also regulated by the carbohydrate supply of its host plant.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">12682827</PMID><DateCompleted><Year>2004</Year><Month>08</Month><Day>11</Day></DateCompleted><DateRevised><Year>2006</Year><Month>11</Month><Day>15</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0940-6360</ISSN><JournalIssue CitedMedium="Print"><Volume>13</Volume><Issue>2</Issue><PubDate><Year>2003</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Mycorrhiza</Title><ISOAbbreviation>Mycorrhiza</ISOAbbreviation></Journal><ArticleTitle>Uptake and transfer of nutrients in ectomycorrhizal associations: interactions between photosynthesis and phosphate nutrition.</ArticleTitle><Pagination><MedlinePgn>59-68</MedlinePgn></Pagination><Abstract><AbstractText>Energy-dispersive X-ray microanalytical investigations and microautoradiographic studies were carried out to examine whether the uptake and transfer of phosphate (P) by an ectomycorrhizal fungus is affected by the carbohydrate supply of its host plant. For this purpose, non-mycorrhizal seedlings of Pinus sylvestris L. and plants inoculated with the ectomycorrhizal basidiomycete Suillus bovinus (L. ex Fr.) Kuntze were placed in the dark for 7 days in advance of a P supply. The subcellular element distribution and the uptake and distribution of (33)P was analyzed in non-mycorrhizal and mycorrhizal roots of these plants and compared with plants kept constantly under normal light conditions (control plants). The results show that placing non-mycorrhizal plants in the dark in advance of the nutrient supply led to (1) a reduction of the subcellular contents of P, S and K, but to an increase in the cytoplasmic Na content, and (2) an increase of (33)P absorption and translocation to the shoot. It can be assumed that this increased inflow of (33)P in non-mycorrhizal plants was due to P starvation after suppressed photosynthesis and reduced respiration of these plants. The suppression of photosynthesis by an ectomycorrhizal host plant and the resulting lower carbohydrate supply conditions for the ectomycorrhizal fungus led to (1) a decrease of P absorption by the mycobiont, (2) a change of the P allocation in the fungal cell compartments of an ectomycorrhizal root, and (3) a reduction of P transfer to the host plant. However, microautoradiographic studies revealed that, under these conditions, P was also absorbed by the mycorrhizal fungus and translocated via the Hartig net to the host plant. In mycorrhizal roots of plants placed in the dark in advance of the nutrient supply, the cytoplasmic P content of the Hartig net was reduced and, instead, a high number of polyphosphate granules could be detected within the hyphae. The results indicate that the exchange processes between the symbionts in a mycorrhiza are possibly linked and that P uptake and translocation by an ectomycorrhizal fungus is also regulated by the carbohydrate supply of its host plant.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Bücking</LastName><ForeName>H</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>University of Bremen, Center for Environmental Research and Technology, Leobenerstrasse, 28359 Bremen, Germany. heibueck@uft.uni-bremen.de</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Heyser</LastName><ForeName>W</ForeName><Initials>W</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2002</Year><Month>08</Month><Day>14</Day></ArticleDate></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Mycorrhiza</MedlineTA><NlmUniqueID>100955036</NlmUniqueID><ISSNLinking>0940-6360</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D010710">Phosphates</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001487" MajorTopicYN="N">Basidiomycota</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D008027" MajorTopicYN="N">Light</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D038821" MajorTopicYN="N">Mycorrhizae</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010710" MajorTopicYN="N">Phosphates</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010788" MajorTopicYN="N">Photosynthesis</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D028223" MajorTopicYN="N">Pinus</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2001</Year><Month>12</Month><Day>18</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2001</Year><Month>07</Month><Day>05</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2003</Year><Month>4</Month><Day>12</Day><Hour>5</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2004</Year><Month>8</Month><Day>12</Day><Hour>5</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2003</Year><Month>4</Month><Day>12</Day><Hour>5</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">12682827</ArticleId><ArticleId IdType="doi">10.1007/s00572-002-0196-3</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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