(14)C fixation, metabolic labeling patterns, and translocation profiles during leaf development in Populus deltoides.
Identifieur interne : 004E48 ( Main/Exploration ); précédent : 004E47; suivant : 004E49(14)C fixation, metabolic labeling patterns, and translocation profiles during leaf development in Populus deltoides.
Auteurs : R E Dickson [États-Unis] ; P R LarsonSource :
- Planta [ 0032-0935 ] ; 1981.
Abstract
The incorporation of photosynthetically fixed (14)CO2 and the distribution of (14)C among the main chemical constituents of laminae and petioles were examined in cottonwood (Populus deltoides Bartr. ex Marsh.) leaves ranging in age from Leaf Plastochron Index (LPI) 3 (about one-quarter to one-third expanded) to LPI 30 (beginning of senescence). In addition, carbon flow among chemical fractions and translocation from leaves of LPI 7 and 14 were examined periodically up to 24 h after labeling. Specific activity of (14)C (on dry-weight basis) increased in developing laminae to full leaf expansion, decreased in the mature leaves to LPI 16, then remained constant to LPI 30. In developing leaves (LPI 3-5), after 2 h, most of the (14)C was found in protein, pigments, lipids, and other structural and metabolic components necessary for cell development; only 28% was in the sugar fraction of the lamina. In fully expanded leaves (LPI 6-8), after 2 h, the sugar fraction contained 50-60% and about 90% of fixed (14)C in the lamina and the petiole, respectively. In a pulsechase "kinetic series" with recently mature leaves, 60% of the (14)C was found in the sugar fraction after 15 min of (14)CO2 fixation. Over the 24-h translocation period, (14)C decreased in sugars to 23% and increased in the combined residue fraction (protein, starch, and structural carbohydrates) to about 60% of the total activity left in the lamina. Within 24 h after labeling, the turnover of (14)C-organic acids,-sugar, and-amino acids (either metabolzed or translocated from the leaf) was 30, 70 and 80%, respectively, of that initially incorporated into these fractions by a leaf at LPI 7 (turnover was 55% of (14)C-organic acids, 80% of (14)C-sugar, and 95% of (14)C-amino acids at LPI 14). Anatomical maturity in cottonwood leaves is closely correlated with physiological maturity and with production of translocatable sugar.
DOI: 10.1007/BF00385364
PubMed: 24301121
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In addition, carbon flow among chemical fractions and translocation from leaves of LPI 7 and 14 were examined periodically up to 24 h after labeling. Specific activity of (14)C (on dry-weight basis) increased in developing laminae to full leaf expansion, decreased in the mature leaves to LPI 16, then remained constant to LPI 30. In developing leaves (LPI 3-5), after 2 h, most of the (14)C was found in protein, pigments, lipids, and other structural and metabolic components necessary for cell development; only 28% was in the sugar fraction of the lamina. In fully expanded leaves (LPI 6-8), after 2 h, the sugar fraction contained 50-60% and about 90% of fixed (14)C in the lamina and the petiole, respectively. In a pulsechase "kinetic series" with recently mature leaves, 60% of the (14)C was found in the sugar fraction after 15 min of (14)CO2 fixation. Over the 24-h translocation period, (14)C decreased in sugars to 23% and increased in the combined residue fraction (protein, starch, and structural carbohydrates) to about 60% of the total activity left in the lamina. Within 24 h after labeling, the turnover of (14)C-organic acids,-sugar, and-amino acids (either metabolzed or translocated from the leaf) was 30, 70 and 80%, respectively, of that initially incorporated into these fractions by a leaf at LPI 7 (turnover was 55% of (14)C-organic acids, 80% of (14)C-sugar, and 95% of (14)C-amino acids at LPI 14). Anatomical maturity in cottonwood leaves is closely correlated with physiological maturity and with production of translocatable sugar. </div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24301121</PMID><DateCompleted><Year>2013</Year><Month>12</Month><Day>05</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>152</Volume><Issue>5</Issue><PubDate><Year>1981</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Planta</Title><ISOAbbreviation>Planta</ISOAbbreviation></Journal><ArticleTitle>(14)C fixation, metabolic labeling patterns, and translocation profiles during leaf development in Populus deltoides.</ArticleTitle><Pagination><MedlinePgn>461-70</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/BF00385364</ELocationID><Abstract><AbstractText>The incorporation of photosynthetically fixed (14)CO2 and the distribution of (14)C among the main chemical constituents of laminae and petioles were examined in cottonwood (Populus deltoides Bartr. ex Marsh.) leaves ranging in age from Leaf Plastochron Index (LPI) 3 (about one-quarter to one-third expanded) to LPI 30 (beginning of senescence). In addition, carbon flow among chemical fractions and translocation from leaves of LPI 7 and 14 were examined periodically up to 24 h after labeling. Specific activity of (14)C (on dry-weight basis) increased in developing laminae to full leaf expansion, decreased in the mature leaves to LPI 16, then remained constant to LPI 30. In developing leaves (LPI 3-5), after 2 h, most of the (14)C was found in protein, pigments, lipids, and other structural and metabolic components necessary for cell development; only 28% was in the sugar fraction of the lamina. In fully expanded leaves (LPI 6-8), after 2 h, the sugar fraction contained 50-60% and about 90% of fixed (14)C in the lamina and the petiole, respectively. In a pulsechase "kinetic series" with recently mature leaves, 60% of the (14)C was found in the sugar fraction after 15 min of (14)CO2 fixation. Over the 24-h translocation period, (14)C decreased in sugars to 23% and increased in the combined residue fraction (protein, starch, and structural carbohydrates) to about 60% of the total activity left in the lamina. Within 24 h after labeling, the turnover of (14)C-organic acids,-sugar, and-amino acids (either metabolzed or translocated from the leaf) was 30, 70 and 80%, respectively, of that initially incorporated into these fractions by a leaf at LPI 7 (turnover was 55% of (14)C-organic acids, 80% of (14)C-sugar, and 95% of (14)C-amino acids at LPI 14). Anatomical maturity in cottonwood leaves is closely correlated with physiological maturity and with production of translocatable sugar. </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Dickson</LastName><ForeName>R E</ForeName><Initials>RE</Initials><AffiliationInfo><Affiliation>U.S. Department of Agriculture, Forest Service, Forestry Sciences Laboratory, North Central Forest Experiment Station, 54501, Rhinelander, WI, USA.</Affiliation></AffiliationInfo></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>Germany</Country><MedlineTA>Planta</MedlineTA><NlmUniqueID>1250576</NlmUniqueID><ISSNLinking>0032-0935</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>1980</Year><Month>08</Month><Day>18</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>1981</Year><Month>05</Month><Day>12</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2013</Year><Month>12</Month><Day>5</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>1981</Year><Month>8</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1981</Year><Month>8</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">24301121</ArticleId><ArticleId IdType="doi">10.1007/BF00385364</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Planta. 1976 Jan;128(1):63-72</Citation><ArticleIdList><ArticleId IdType="pubmed">24430608</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1970 Feb;45(2):107-13</Citation><ArticleIdList><ArticleId IdType="pubmed">16657286</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1971 Aug;48(2):143-5</Citation><ArticleIdList><ArticleId IdType="pubmed">16657751</ArticleId></ArticleIdList></Reference><Reference><Citation>Symp Soc Exp Biol. 1967;21:483-506</Citation><ArticleIdList><ArticleId IdType="pubmed">6069303</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1975 Jan;123(1):53-62</Citation><ArticleIdList><ArticleId IdType="pubmed">24436024</ArticleId></ArticleIdList></Reference><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>Plant Physiol. 1961 Sep;36(5):581-8</Citation><ArticleIdList><ArticleId IdType="pubmed">16655557</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1964 Jul;39(4):663-72</Citation><ArticleIdList><ArticleId IdType="pubmed">16655980</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1974 Dec;54(6):877-85</Citation><ArticleIdList><ArticleId IdType="pubmed">16658993</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1979 Nov;64(5):749-53</Citation><ArticleIdList><ArticleId IdType="pubmed">16661047</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1976 Jan;128(3):185-93</Citation><ArticleIdList><ArticleId IdType="pubmed">24430745</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1977 Jan;134(3):241-9</Citation><ArticleIdList><ArticleId IdType="pubmed">24419777</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1969 Jun;88(2):103-12</Citation><ArticleIdList><ArticleId IdType="pubmed">24504859</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1975 Jul;56(1):23-7</Citation><ArticleIdList><ArticleId IdType="pubmed">16659251</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1971 Jun;98(2):136-49</Citation><ArticleIdList><ArticleId IdType="pubmed">24493347</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></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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