Accumulation of sugars in the xylem apoplast observed under water stress conditions is controlled by xylem pH.
Identifieur interne : 001A18 ( Main/Exploration ); précédent : 001A17; suivant : 001A19Accumulation of sugars in the xylem apoplast observed under water stress conditions is controlled by xylem pH.
Auteurs : Francesca Secchi [Italie] ; Maciej A. Zwieniecki [États-Unis]Source :
- Plant, cell & environment [ 1365-3040 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Oses, Populus, Tiges de plante, Xylème.
- physiologie : Populus, Tiges de plante.
- Concentration en ions d'hydrogène, Déshydratation.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Monosaccharides.
- metabolism : Plant Stems, Populus, Xylem.
- physiology : Plant Stems, Populus.
- Dehydration, Hydrogen-Ion Concentration.
Abstract
Severe water stress constrains, or even stops, water transport in the xylem due to embolism formation. Previously, the xylem of poplar trees was shown to respond to embolism formation by accumulating carbohydrates in the xylem apoplast and dropping xylem sap pH. We hypothesize that these two processes may be functionally linked as lower pH activates acidic invertases degrading sucrose and inducing accumulation of monosaccharides in xylem apoplast. Using a novel in vivo method to measure xylem apoplast pH, we show that pH drops from ~6.2 to ~5.6 in stems of severely stressed plants and rises following recovery of stem water status. We also show that in a lower pH environment, sugars are continuously accumulating in the xylem apoplast. Apoplastic carbohydrate accumulation was reduced significantly in the presence of a proton pump blocker (orthovanadate). These observations suggest that a balance in sugar concentrations exists between the xylem apoplast and symplast that can be controlled by xylem pH and sugar concentration. We conclude that lower pH is related to loss of xylem transport function, eventually resulting in accumulation of sugars that primes stems for recovery from embolism when water stress is relieved.
DOI: 10.1111/pce.12767
PubMed: 27187245
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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Previously, the xylem of poplar trees was shown to respond to embolism formation by accumulating carbohydrates in the xylem apoplast and dropping xylem sap pH. We hypothesize that these two processes may be functionally linked as lower pH activates acidic invertases degrading sucrose and inducing accumulation of monosaccharides in xylem apoplast. Using a novel in vivo method to measure xylem apoplast pH, we show that pH drops from ~6.2 to ~5.6 in stems of severely stressed plants and rises following recovery of stem water status. We also show that in a lower pH environment, sugars are continuously accumulating in the xylem apoplast. Apoplastic carbohydrate accumulation was reduced significantly in the presence of a proton pump blocker (orthovanadate). These observations suggest that a balance in sugar concentrations exists between the xylem apoplast and symplast that can be controlled by xylem pH and sugar concentration. We conclude that lower pH is related to loss of xylem transport function, eventually resulting in accumulation of sugars that primes stems for recovery from embolism when water stress is relieved.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">27187245</PMID><DateCompleted><Year>2017</Year><Month>12</Month><Day>07</Day></DateCompleted><DateRevised><Year>2018</Year><Month>07</Month><Day>31</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1365-3040</ISSN><JournalIssue CitedMedium="Internet"><Volume>39</Volume><Issue>11</Issue><PubDate><Year>2016</Year><Month>11</Month></PubDate></JournalIssue><Title>Plant, cell & environment</Title><ISOAbbreviation>Plant Cell Environ</ISOAbbreviation></Journal><ArticleTitle>Accumulation of sugars in the xylem apoplast observed under water stress conditions is controlled by xylem pH.</ArticleTitle><Pagination><MedlinePgn>2350-2360</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/pce.12767</ELocationID><Abstract><AbstractText>Severe water stress constrains, or even stops, water transport in the xylem due to embolism formation. Previously, the xylem of poplar trees was shown to respond to embolism formation by accumulating carbohydrates in the xylem apoplast and dropping xylem sap pH. We hypothesize that these two processes may be functionally linked as lower pH activates acidic invertases degrading sucrose and inducing accumulation of monosaccharides in xylem apoplast. Using a novel in vivo method to measure xylem apoplast pH, we show that pH drops from ~6.2 to ~5.6 in stems of severely stressed plants and rises following recovery of stem water status. We also show that in a lower pH environment, sugars are continuously accumulating in the xylem apoplast. Apoplastic carbohydrate accumulation was reduced significantly in the presence of a proton pump blocker (orthovanadate). These observations suggest that a balance in sugar concentrations exists between the xylem apoplast and symplast that can be controlled by xylem pH and sugar concentration. We conclude that lower pH is related to loss of xylem transport function, eventually resulting in accumulation of sugars that primes stems for recovery from embolism when water stress is relieved.</AbstractText><CopyrightInformation>© 2016 John Wiley & Sons Ltd.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Secchi</LastName><ForeName>Francesca</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino, Italy. francesca.secchi@unito.it.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zwieniecki</LastName><ForeName>Maciej A</ForeName><Initials>MA</Initials><AffiliationInfo><Affiliation>Department of Plant Sciences, UC Davis, Davis, CA, USA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2016</Year><Month>07</Month><Day>11</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Cell Environ</MedlineTA><NlmUniqueID>9309004</NlmUniqueID><ISSNLinking>0140-7791</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D009005">Monosaccharides</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><CommentsCorrectionsList><CommentsCorrections RefType="CommentIn"><RefSource>Plant Cell Environ. 2016 Nov;39(11):2347-2349</RefSource><PMID Version="1">27351802</PMID></CommentsCorrections></CommentsCorrectionsList><MeshHeadingList><MeshHeading><DescriptorName UI="D003681" MajorTopicYN="Y">Dehydration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D006863" MajorTopicYN="N">Hydrogen-Ion Concentration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D009005" MajorTopicYN="N">Monosaccharides</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018547" MajorTopicYN="N">Plant Stems</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D052584" MajorTopicYN="N">Xylem</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="Y">in vivo pH</Keyword><Keyword MajorTopicYN="Y">recovery</Keyword><Keyword MajorTopicYN="Y">sugar accumulation</Keyword><Keyword MajorTopicYN="Y">xylem apoplast</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2016</Year><Month>02</Month><Day>19</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2016</Year><Month>05</Month><Day>05</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2016</Year><Month>05</Month><Day>09</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2016</Year><Month>5</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2017</Year><Month>12</Month><Day>8</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2016</Year><Month>5</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">27187245</ArticleId><ArticleId IdType="doi">10.1111/pce.12767</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Italie</li><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="Italie"><noRegion><name sortKey="Secchi, Francesca" sort="Secchi, Francesca" uniqKey="Secchi F" first="Francesca" last="Secchi">Francesca Secchi</name></noRegion></country><country name="États-Unis"><region name="Californie"><name sortKey="Zwieniecki, Maciej A" sort="Zwieniecki, Maciej A" uniqKey="Zwieniecki M" first="Maciej A" last="Zwieniecki">Maciej A. 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