Translocation pathways in the petioles and stem between source and sink leaves of Populus deltoides Bartr. ex Marsh.
Identifieur interne : 004E30 ( Main/Exploration ); précédent : 004E29; suivant : 004E31Translocation pathways in the petioles and stem between source and sink leaves of Populus deltoides Bartr. ex Marsh.
Auteurs : T C Vogelmann [États-Unis] ; P R Larson ; R E DicksonSource :
- Planta [ 0032-0935 ] ; 1982.
Abstract
Microautoradiography was used to follow the translocation pathways of (14)C-labeled photosynthate from mature source leaves, through the stem, to immature sink leaves three nodes above. Translocation occurred in specific bundles of the midveins and petioles of both the source and sink leaves and in the interjacent internodes. When each of six major veins in the lamina of an exporting leaf was independently spot-fed (14)CO2, label was exported through specific bundles in the petiole associated with that vein. When the whole lamina of a mature source leaf was fed (14)CO2, export occurred through all bundles of the lamina, but acropetal export in the stem was confined to bundles serving certain immature sink leaves. Cross-transfer occurred within the stem via phloem bridges. Leaves approaching maturity translocated photosynthate bidirectionally in adjacent subsidiary bundles of the petiole. That is, petiolar bundles serving the lamina apex were exporting unlabeled photosynthate while those serving the lamina base were simultaneously importing labeled photosynthate. The petioles and midveins of maturing leaves were strong sinks for photosynthate, which was diverted from the export front to differentiating structural tissues. The data support the idea of bidirectional transport in adjacent bundles of the petiole and possibly in adjacent sieve tubes within an individual bundle.
DOI: 10.1007/BF00397473
PubMed: 24272580
Affiliations:
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Translocation occurred in specific bundles of the midveins and petioles of both the source and sink leaves and in the interjacent internodes. When each of six major veins in the lamina of an exporting leaf was independently spot-fed (14)CO2, label was exported through specific bundles in the petiole associated with that vein. When the whole lamina of a mature source leaf was fed (14)CO2, export occurred through all bundles of the lamina, but acropetal export in the stem was confined to bundles serving certain immature sink leaves. Cross-transfer occurred within the stem via phloem bridges. Leaves approaching maturity translocated photosynthate bidirectionally in adjacent subsidiary bundles of the petiole. That is, petiolar bundles serving the lamina apex were exporting unlabeled photosynthate while those serving the lamina base were simultaneously importing labeled photosynthate. The petioles and midveins of maturing leaves were strong sinks for photosynthate, which was diverted from the export front to differentiating structural tissues. The data support the idea of bidirectional transport in adjacent bundles of the petiole and possibly in adjacent sieve tubes within an individual bundle. </div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24272580</PMID><DateCompleted><Year>2013</Year><Month>11</Month><Day>26</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0032-0935</ISSN><JournalIssue CitedMedium="Print"><Volume>156</Volume><Issue>4</Issue><PubDate><Year>1982</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Planta</Title><ISOAbbreviation>Planta</ISOAbbreviation></Journal><ArticleTitle>Translocation pathways in the petioles and stem between source and sink leaves of Populus deltoides Bartr. ex Marsh.</ArticleTitle><Pagination><MedlinePgn>345-58</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/BF00397473</ELocationID><Abstract><AbstractText>Microautoradiography was used to follow the translocation pathways of (14)C-labeled photosynthate from mature source leaves, through the stem, to immature sink leaves three nodes above. Translocation occurred in specific bundles of the midveins and petioles of both the source and sink leaves and in the interjacent internodes. When each of six major veins in the lamina of an exporting leaf was independently spot-fed (14)CO2, label was exported through specific bundles in the petiole associated with that vein. When the whole lamina of a mature source leaf was fed (14)CO2, export occurred through all bundles of the lamina, but acropetal export in the stem was confined to bundles serving certain immature sink leaves. Cross-transfer occurred within the stem via phloem bridges. Leaves approaching maturity translocated photosynthate bidirectionally in adjacent subsidiary bundles of the petiole. That is, petiolar bundles serving the lamina apex were exporting unlabeled photosynthate while those serving the lamina base were simultaneously importing labeled photosynthate. The petioles and midveins of maturing leaves were strong sinks for photosynthate, which was diverted from the export front to differentiating structural tissues. The data support the idea of bidirectional transport in adjacent bundles of the petiole and possibly in adjacent sieve tubes within an individual bundle. </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Vogelmann</LastName><ForeName>T C</ForeName><Initials>TC</Initials><AffiliationInfo><Affiliation>North Central Forest Experiment Station, U.S. Department of Agriculture, Forest Service, Box 898, 54501, Rhinelander, WI, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Larson</LastName><ForeName>P R</ForeName><Initials>PR</Initials></Author><Author ValidYN="Y"><LastName>Dickson</LastName><ForeName>R E</ForeName><Initials>RE</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Planta</MedlineTA><NlmUniqueID>1250576</NlmUniqueID><ISSNLinking>0032-0935</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>1982</Year><Month>06</Month><Day>01</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>1982</Year><Month>08</Month><Day>24</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2013</Year><Month>11</Month><Day>26</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>1982</Year><Month>12</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1982</Year><Month>12</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">24272580</ArticleId><ArticleId IdType="doi">10.1007/BF00397473</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Plant Physiol. 1975 Aug;56(2):185-93</Citation><ArticleIdList><ArticleId IdType="pubmed">16659271</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1973 Jun;111(2):95-112</Citation><ArticleIdList><ArticleId IdType="pubmed">24469506</ArticleId></ArticleIdList></Reference><Reference><Citation>J Ultrastruct Res. 1969 Jan;26(1):31-43</Citation><ArticleIdList><ArticleId IdType="pubmed">4887011</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1971 Feb;47(2):212-6</Citation><ArticleIdList><ArticleId IdType="pubmed">16657598</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1973 Jun;113(2):179-91</Citation><ArticleIdList><ArticleId IdType="pubmed">24468909</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1973 Jun;112(2):169-79</Citation><ArticleIdList><ArticleId IdType="pubmed">24469898</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1974 Dec;54(6):877-85</Citation><ArticleIdList><ArticleId IdType="pubmed">16658993</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1976 Jan;128(3):185-93</Citation><ArticleIdList><ArticleId IdType="pubmed">24430745</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1974 Jan;53(1):21-7</Citation><ArticleIdList><ArticleId IdType="pubmed">16658645</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1977 Jan;134(3):241-9</Citation><ArticleIdList><ArticleId IdType="pubmed">24419777</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1982 Aug;70(2):606-9</Citation><ArticleIdList><ArticleId IdType="pubmed">16662542</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Wisconsin</li></region></list><tree><noCountry><name sortKey="Dickson, R E" sort="Dickson, R E" uniqKey="Dickson R" first="R E" last="Dickson">R E Dickson</name><name sortKey="Larson, P R" sort="Larson, P R" uniqKey="Larson P" first="P R" last="Larson">P R Larson</name></noCountry><country name="États-Unis"><region name="Wisconsin"><name sortKey="Vogelmann, T C" sort="Vogelmann, T C" uniqKey="Vogelmann T" first="T C" last="Vogelmann">T C Vogelmann</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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