Fixation patterns of (14)C within developing leaves of eastern cottonwood.
Identifieur interne : 004F16 ( Main/Exploration ); précédent : 004F15; suivant : 004F17Fixation patterns of (14)C within developing leaves of eastern cottonwood.
Auteurs : P R Larson [États-Unis] ; J G Isebrands ; R E DicksonSource :
- Planta [ 0032-0935 ] ; 1972.
Abstract
Individual leaves of eastern cottonwood (Populus deltoides), representing an ontogenetic series from leaf plastochron index 0.0 to 8.0, were fed (14)CO2 photosynthetically and then harvested at times ranging from 15 to 1440 min. The lamina of each fed leaf was sectioned from tip to base into 5 parts, and each part was quantitatively assayed for (14)C activity. In young leaves, the percentage of the total (14)C fixed (expressed in dpm/mg of dry leaf tissue) was high in the lamina tip and decreased almost linearly toward the base. With increasing leaf age, the percentage of (14)C fixed decreased in the lamina tip and increased in the base. The relative activity in mature leaves was almost uniform throughout the lamina. No differences were detected in the (14)C distribution patterns within leaves over the time series.On the basis of the data presented and of anatomical observations of developing cottonwood leaves, the hypothesis that the precociously mature lamina tip may provide photosynthates to the still-expanding lamina base was shown to be invalid. It is concluded that bidirectional transport in a developing cottonwood leaf results from simultaneous import to the immature basal region and export from the mature tip.
DOI: 10.1007/BF00386392
PubMed: 24477480
Affiliations:
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The lamina of each fed leaf was sectioned from tip to base into 5 parts, and each part was quantitatively assayed for (14)C activity. In young leaves, the percentage of the total (14)C fixed (expressed in dpm/mg of dry leaf tissue) was high in the lamina tip and decreased almost linearly toward the base. With increasing leaf age, the percentage of (14)C fixed decreased in the lamina tip and increased in the base. The relative activity in mature leaves was almost uniform throughout the lamina. No differences were detected in the (14)C distribution patterns within leaves over the time series.On the basis of the data presented and of anatomical observations of developing cottonwood leaves, the hypothesis that the precociously mature lamina tip may provide photosynthates to the still-expanding lamina base was shown to be invalid. It is concluded that bidirectional transport in a developing cottonwood leaf results from simultaneous import to the immature basal region and export from the mature tip. </div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24477480</PMID><DateCompleted><Year>2014</Year><Month>01</Month><Day>31</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>107</Volume><Issue>4</Issue><PubDate><Year>1972</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Planta</Title><ISOAbbreviation>Planta</ISOAbbreviation></Journal><ArticleTitle>Fixation patterns of (14)C within developing leaves of eastern cottonwood.</ArticleTitle><Pagination><MedlinePgn>301-14</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/BF00386392</ELocationID><Abstract><AbstractText>Individual leaves of eastern cottonwood (Populus deltoides), representing an ontogenetic series from leaf plastochron index 0.0 to 8.0, were fed (14)CO2 photosynthetically and then harvested at times ranging from 15 to 1440 min. The lamina of each fed leaf was sectioned from tip to base into 5 parts, and each part was quantitatively assayed for (14)C activity. In young leaves, the percentage of the total (14)C fixed (expressed in dpm/mg of dry leaf tissue) was high in the lamina tip and decreased almost linearly toward the base. With increasing leaf age, the percentage of (14)C fixed decreased in the lamina tip and increased in the base. The relative activity in mature leaves was almost uniform throughout the lamina. No differences were detected in the (14)C distribution patterns within leaves over the time series.On the basis of the data presented and of anatomical observations of developing cottonwood leaves, the hypothesis that the precociously mature lamina tip may provide photosynthates to the still-expanding lamina base was shown to be invalid. It is concluded that bidirectional transport in a developing cottonwood leaf results from simultaneous import to the immature basal region and export from the mature tip. </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Larson</LastName><ForeName>P R</ForeName><Initials>PR</Initials><AffiliationInfo><Affiliation>North Central Forest Experiment Station, USDA Forest Service, Rhinelander, Wisconsin, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Isebrands</LastName><ForeName>J G</ForeName><Initials>JG</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>1972</Year><Month>05</Month><Day>16</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2014</Year><Month>1</Month><Day>31</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>1972</Year><Month>12</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1972</Year><Month>12</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">24477480</ArticleId><ArticleId IdType="doi">10.1007/BF00386392</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Plant Physiol. 1955 Mar;30(2):184-5</Citation><ArticleIdList><ArticleId IdType="pubmed">16654752</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1971 Feb;47(2):212-6</Citation><ArticleIdList><ArticleId IdType="pubmed">16657598</ArticleId></ArticleIdList></Reference><Reference><Citation>Symp Soc Exp Biol. 1967;21:559-99</Citation><ArticleIdList><ArticleId IdType="pubmed">6051509</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="Isebrands, J G" sort="Isebrands, J G" uniqKey="Isebrands J" first="J G" last="Isebrands">J G Isebrands</name></noCountry><country name="États-Unis"><region name="Wisconsin"><name sortKey="Larson, P R" sort="Larson, P R" uniqKey="Larson P" first="P R" last="Larson">P R Larson</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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