Glutamine Transfer from Xylem to Phloem and Translocation to Developing Leaves of Populus deltoides.
Identifieur interne : 004D97 ( Main/Exploration ); précédent : 004D96; suivant : 004D98Glutamine Transfer from Xylem to Phloem and Translocation to Developing Leaves of Populus deltoides.
Auteurs : R E Dickson [États-Unis] ; T C Vogelmann ; P R LarsonSource :
- Plant physiology [ 0032-0889 ] ; 1985.
Abstract
The distribution of (14)C from xylem-borne [(14)C]glutamine, the major nitrogen compound moving in xylem sap of cottonwood (Populus deltoides Bartr. ex Marsh), was followed in rapidly growing shoots with a combination of autoradiographic, microautoradiographic, and radioassay techniques. Autoradiography and (14)C analyses of tissues showed that xylem-borne glutamine did not move with the transpiration stream into mature leaves. Instead, most of it was transferred from xylem to phloem in the upper stem and then translocated to young developing tissues. Microautoradiography showed that metaxylem parenchyma, secondary xylem parenchyma, and rays were the major areas of uptake from xylem vessels in the stem. Accumulation in phloem (high (14)C concentrations in sieve tubes) took place in internodes subtending recently mature leaves. Little (14)C from xylem-borne glutamine was found in phloem of mature leaves, which indicates restricted retransport of glutamine that did enter the leaf. In the primary tissues of the upper stem, most (14)C was found in the phloem. Cottonwood stems have an efficient uptake and transfer system that enhances glutamine movement to developing tissues of the upper stem.
DOI: 10.1104/pp.77.2.412
PubMed: 16664068
PubMed Central: PMC1064529
Affiliations:
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Autoradiography and (14)C analyses of tissues showed that xylem-borne glutamine did not move with the transpiration stream into mature leaves. Instead, most of it was transferred from xylem to phloem in the upper stem and then translocated to young developing tissues. Microautoradiography showed that metaxylem parenchyma, secondary xylem parenchyma, and rays were the major areas of uptake from xylem vessels in the stem. Accumulation in phloem (high (14)C concentrations in sieve tubes) took place in internodes subtending recently mature leaves. Little (14)C from xylem-borne glutamine was found in phloem of mature leaves, which indicates restricted retransport of glutamine that did enter the leaf. In the primary tissues of the upper stem, most (14)C was found in the phloem. Cottonwood stems have an efficient uptake and transfer system that enhances glutamine movement to developing tissues of the upper stem.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">16664068</PMID><DateCompleted><Year>2010</Year><Month>06</Month><Day>29</Day></DateCompleted><DateRevised><Year>2019</Year><Month>05</Month><Day>14</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0032-0889</ISSN><JournalIssue CitedMedium="Print"><Volume>77</Volume><Issue>2</Issue><PubDate><Year>1985</Year><Month>Feb</Month></PubDate></JournalIssue><Title>Plant physiology</Title><ISOAbbreviation>Plant Physiol</ISOAbbreviation></Journal><ArticleTitle>Glutamine Transfer from Xylem to Phloem and Translocation to Developing Leaves of Populus deltoides.</ArticleTitle><Pagination><MedlinePgn>412-7</MedlinePgn></Pagination><Abstract><AbstractText>The distribution of (14)C from xylem-borne [(14)C]glutamine, the major nitrogen compound moving in xylem sap of cottonwood (Populus deltoides Bartr. ex Marsh), was followed in rapidly growing shoots with a combination of autoradiographic, microautoradiographic, and radioassay techniques. Autoradiography and (14)C analyses of tissues showed that xylem-borne glutamine did not move with the transpiration stream into mature leaves. Instead, most of it was transferred from xylem to phloem in the upper stem and then translocated to young developing tissues. Microautoradiography showed that metaxylem parenchyma, secondary xylem parenchyma, and rays were the major areas of uptake from xylem vessels in the stem. Accumulation in phloem (high (14)C concentrations in sieve tubes) took place in internodes subtending recently mature leaves. Little (14)C from xylem-borne glutamine was found in phloem of mature leaves, which indicates restricted retransport of glutamine that did enter the leaf. In the primary tissues of the upper stem, most (14)C was found in the phloem. Cottonwood stems have an efficient uptake and transfer system that enhances glutamine movement to developing tissues of the upper stem.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Dickson</LastName><ForeName>R E</ForeName><Initials>RE</Initials><AffiliationInfo><Affiliation>United States Department of Agriculture, Forest Service, North Central Forest Experiment Station, Rhinelander, Wisconsin 54501.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Vogelmann</LastName><ForeName>T C</ForeName><Initials>TC</Initials></Author><Author ValidYN="Y"><LastName>Larson</LastName><ForeName>P R</ForeName><Initials>PR</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Physiol</MedlineTA><NlmUniqueID>0401224</NlmUniqueID><ISSNLinking>0032-0889</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1985</Year><Month>2</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1985</Year><Month>2</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1985</Year><Month>2</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">16664068</ArticleId><ArticleId IdType="pmc">PMC1064529</ArticleId><ArticleId IdType="doi">10.1104/pp.77.2.412</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Plant Physiol. 1979 Jun;63(6):1076-81</Citation><ArticleIdList><ArticleId IdType="pubmed">16660860</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1981 Jan;67(1):30-6</Citation><ArticleIdList><ArticleId IdType="pubmed">16661628</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1981 Jan;67(1):37-42</Citation><ArticleIdList><ArticleId IdType="pubmed">16661629</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1982 May;69(5):1226-32</Citation><ArticleIdList><ArticleId IdType="pubmed">16662375</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1982 Aug;70(2):606-9</Citation><ArticleIdList><ArticleId IdType="pubmed">16662542</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1985 Feb;77(2):418-28</Citation><ArticleIdList><ArticleId IdType="pubmed">16664069</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Wisconsin</li></region></list><tree><noCountry><name sortKey="Larson, P R" sort="Larson, P R" uniqKey="Larson P" first="P R" last="Larson">P R Larson</name><name sortKey="Vogelmann, T C" sort="Vogelmann, T C" uniqKey="Vogelmann T" first="T C" last="Vogelmann">T C Vogelmann</name></noCountry><country name="États-Unis"><region name="Wisconsin"><name sortKey="Dickson, R E" sort="Dickson, R E" uniqKey="Dickson R" first="R E" last="Dickson">R E Dickson</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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