Some evidence for the existence of turgor pressure gradients in the sieve tubes of willow.
Identifieur interne : 002611 ( Main/Exploration ); précédent : 002610; suivant : 002612Some evidence for the existence of turgor pressure gradients in the sieve tubes of willow.
Auteurs : S. Rogers [Royaume-Uni] ; A J PeelSource :
- Planta [ 0032-0935 ] ; 1975.
Abstract
Sieve tube sap was collected either from the severed stylets of Tuberolachnus salignus (Gmelin) or via incisions made into the phloem of small willow trees or potted cuttings. Measurements of the osmotic potential (O.P.) of sap samples showed a gradient to exist in the presumed direction of assimilate transport, ie from apex to base of the stem.In most experiments samples of phloem tissue were taken after the collection of sieve tube sap, the water potential of these pieces of tissue being measured in a psychometer. Although a water potential gradient existed in the opposite sense to the O.P. gradient in the sap (lowest water potential at the apex of the stem), the difference between O.P. and W.P. indicated the turgor of the sieve tubes to be higher at the apex than at the base of the stem. The magnitude of the turgor gradient measured in this way lay between 0.5 and 2.7 atm m(-1).In other experiments severed stylets only were used to determine whether a hydrostatic gradient can exist in willow sieve tubes. After measurement of flow rates from stylets sited at the apex and base of willow stems, the Poiseuille expression was used to calculate the pressure at the point of stylet puncture. These experiments gave values for the pressure gradient (in the presumed direction of assimilate flow) of between 1.9 and 4.7 atm m(-1).
DOI: 10.1007/BF00388967
PubMed: 24430219
Affiliations:
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Rogers</name><affiliation wicri:level="1"><nlm:affiliation>Department of Plant Biology, The University, HU6 7RX, Hull, UK.</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Plant Biology, The University, HU6 7RX, Hull</wicri:regionArea><wicri:noRegion>Hull</wicri:noRegion></affiliation></author><author><name sortKey="Peel, A J" sort="Peel, A J" uniqKey="Peel A" first="A J" last="Peel">A J Peel</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1975">1975</date><idno type="RBID">pubmed:24430219</idno><idno type="pmid">24430219</idno><idno type="doi">10.1007/BF00388967</idno><idno type="wicri:Area/Main/Corpus">002615</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">002615</idno><idno type="wicri:Area/Main/Curation">002615</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">002615</idno><idno type="wicri:Area/Main/Exploration">002615</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Some evidence for the existence of turgor pressure gradients in the sieve tubes of willow.</title><author><name sortKey="Rogers, S" sort="Rogers, S" uniqKey="Rogers S" first="S" last="Rogers">S. Rogers</name><affiliation wicri:level="1"><nlm:affiliation>Department of Plant Biology, The University, HU6 7RX, Hull, UK.</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Plant Biology, The University, HU6 7RX, Hull</wicri:regionArea><wicri:noRegion>Hull</wicri:noRegion></affiliation></author><author><name sortKey="Peel, A J" sort="Peel, A J" uniqKey="Peel A" first="A J" last="Peel">A J Peel</name></author></analytic><series><title level="j">Planta</title><idno type="ISSN">0032-0935</idno><imprint><date when="1975" type="published">1975</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Sieve tube sap was collected either from the severed stylets of Tuberolachnus salignus (Gmelin) or via incisions made into the phloem of small willow trees or potted cuttings. Measurements of the osmotic potential (O.P.) of sap samples showed a gradient to exist in the presumed direction of assimilate transport, ie from apex to base of the stem.In most experiments samples of phloem tissue were taken after the collection of sieve tube sap, the water potential of these pieces of tissue being measured in a psychometer. Although a water potential gradient existed in the opposite sense to the O.P. gradient in the sap (lowest water potential at the apex of the stem), the difference between O.P. and W.P. indicated the turgor of the sieve tubes to be higher at the apex than at the base of the stem. The magnitude of the turgor gradient measured in this way lay between 0.5 and 2.7 atm m(-1).In other experiments severed stylets only were used to determine whether a hydrostatic gradient can exist in willow sieve tubes. After measurement of flow rates from stylets sited at the apex and base of willow stems, the Poiseuille expression was used to calculate the pressure at the point of stylet puncture. These experiments gave values for the pressure gradient (in the presumed direction of assimilate flow) of between 1.9 and 4.7 atm m(-1). </div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24430219</PMID><DateCompleted><Year>2014</Year><Month>01</Month><Day>17</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>126</Volume><Issue>3</Issue><PubDate><Year>1975</Year><Month>Jan</Month></PubDate></JournalIssue><Title>Planta</Title><ISOAbbreviation>Planta</ISOAbbreviation></Journal><ArticleTitle>Some evidence for the existence of turgor pressure gradients in the sieve tubes of willow.</ArticleTitle><Pagination><MedlinePgn>259-67</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/BF00388967</ELocationID><Abstract><AbstractText>Sieve tube sap was collected either from the severed stylets of Tuberolachnus salignus (Gmelin) or via incisions made into the phloem of small willow trees or potted cuttings. Measurements of the osmotic potential (O.P.) of sap samples showed a gradient to exist in the presumed direction of assimilate transport, ie from apex to base of the stem.In most experiments samples of phloem tissue were taken after the collection of sieve tube sap, the water potential of these pieces of tissue being measured in a psychometer. Although a water potential gradient existed in the opposite sense to the O.P. gradient in the sap (lowest water potential at the apex of the stem), the difference between O.P. and W.P. indicated the turgor of the sieve tubes to be higher at the apex than at the base of the stem. The magnitude of the turgor gradient measured in this way lay between 0.5 and 2.7 atm m(-1).In other experiments severed stylets only were used to determine whether a hydrostatic gradient can exist in willow sieve tubes. After measurement of flow rates from stylets sited at the apex and base of willow stems, the Poiseuille expression was used to calculate the pressure at the point of stylet puncture. These experiments gave values for the pressure gradient (in the presumed direction of assimilate flow) of between 1.9 and 4.7 atm m(-1). </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Rogers</LastName><ForeName>S</ForeName><Initials>S</Initials><AffiliationInfo><Affiliation>Department of Plant Biology, The University, HU6 7RX, Hull, UK.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Peel</LastName><ForeName>A J</ForeName><Initials>AJ</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>1975</Year><Month>05</Month><Day>12</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>1975</Year><Month>07</Month><Day>14</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2014</Year><Month>1</Month><Day>17</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>1975</Year><Month>1</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1975</Year><Month>1</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">24430219</ArticleId><ArticleId IdType="doi">10.1007/BF00388967</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Plant Physiol. 1967 Feb;42(2):191-4</Citation><ArticleIdList><ArticleId IdType="pubmed">16656495</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1968 Jul;43(7):1042-8</Citation><ArticleIdList><ArticleId IdType="pubmed">16656880</ArticleId></ArticleIdList></Reference><Reference><Citation>Int Rev Cytol. 1968;24:149-92</Citation><ArticleIdList><ArticleId IdType="pubmed">4177021</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1957 Sep;32(5):399-404</Citation><ArticleIdList><ArticleId IdType="pubmed">16655019</ArticleId></ArticleIdList></Reference><Reference><Citation>Planta. 1974 Dec;117(4):303-19</Citation><ArticleIdList><ArticleId IdType="pubmed">24458461</ArticleId></ArticleIdList></Reference><Reference><Citation>Plant Physiol. 1958 Mar;33(2):81-93</Citation><ArticleIdList><ArticleId IdType="pubmed">16655100</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>Royaume-Uni</li></country></list><tree><noCountry><name sortKey="Peel, A J" sort="Peel, A J" uniqKey="Peel A" first="A J" last="Peel">A J Peel</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Rogers, S" sort="Rogers, S" uniqKey="Rogers S" first="S" last="Rogers">S. 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