Redox states of glutathione and ascorbate in root tips of poplar (Populus tremula X P. alba) depend on phloem transport from the shoot to the roots.
Identifieur interne : 003142 ( Main/Exploration ); précédent : 003141; suivant : 003143Redox states of glutathione and ascorbate in root tips of poplar (Populus tremula X P. alba) depend on phloem transport from the shoot to the roots.
Auteurs : Cornelia Herschbach [Allemagne] ; Ursula Scheerer ; Heinz RennenbergSource :
- Journal of experimental botany [ 1460-2431 ] ; 2010.
Descripteurs français
- KwdFr :
- Acide ascorbique (métabolisme), Glutathion (métabolisme), Oxydoréduction (MeSH), Phloème (croissance et développement), Phloème (métabolisme), Populus (croissance et développement), Populus (métabolisme), Pousses de plante (croissance et développement), Pousses de plante (métabolisme), Racines de plante (croissance et développement), Racines de plante (métabolisme), Transport biologique (MeSH).
- MESH :
- croissance et développement : Phloème, Populus, Pousses de plante, Racines de plante.
- métabolisme : Acide ascorbique, Glutathion, Phloème, Populus, Pousses de plante, Racines de plante.
- Oxydoréduction, Transport biologique.
English descriptors
- KwdEn :
- Ascorbic Acid (metabolism), Biological Transport (MeSH), Glutathione (metabolism), Oxidation-Reduction (MeSH), Phloem (growth & development), Phloem (metabolism), Plant Roots (growth & development), Plant Roots (metabolism), Plant Shoots (growth & development), Plant Shoots (metabolism), Populus (growth & development), Populus (metabolism).
- MESH :
- chemical , metabolism : Ascorbic Acid, Glutathione.
- growth & development : Phloem, Plant Roots, Plant Shoots, Populus.
- metabolism : Phloem, Plant Roots, Plant Shoots, Populus.
- Biological Transport, Oxidation-Reduction.
Abstract
Glutathione (GSH) and ascorbate (ASC) are important antioxidants that are involved in stress defence and cell proliferation of meristematic root cells. In principle, synthesis of ASC and GSH in the roots as well as ASC and GSH transport from the shoot to the roots by phloem mass flow is possible. However, it is not yet known whether the ASC and/or the GSH level in roots depends on the supply from the shoot. This was analysed by feeding mature leaves with [(14)C]ASC or [(35)S]GSH and subsequent detection of the radiolabel in different root fractions. Quantitative dependency of root ASC and GSH on shoot-derived ASC and GSH was investigated with poplar (Populus tremula X P. alba) trees interrupted in phloem transport. [(35)S]GSH is transported from mature leaves to the root tips, but is withdrawn from the phloem along the entire transport path. When phloem transport was interrupted, the GSH content in root tips halved within 3 d. [(14)C]ASC is also transported from mature leaves to the root tips but, in contrast to GSH, ASC is not removed from the phloem along the transport path. Accordingly, ASC accumulates in root tips. Interruption of phloem transport disturbed the level and the ASC redox state within the entire root system. Diminished total ASC levels were attributed mainly to a decline of dehydroascorbate (DHA). As the redox state of ASC is of particular significance for root growth and development, it is concluded that phloem transport of ASC may constitute a shoot to root signal to coordinate growth and development at the whole plant level.
DOI: 10.1093/jxb/erp371
PubMed: 20022923
PubMed Central: PMC2826650
Affiliations:
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nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Fribourg-en-Brisgau</settlement></placeName></affiliation></author><author><name sortKey="Scheerer, Ursula" sort="Scheerer, Ursula" uniqKey="Scheerer U" first="Ursula" last="Scheerer">Ursula Scheerer</name></author><author><name sortKey="Rennenberg, Heinz" sort="Rennenberg, Heinz" uniqKey="Rennenberg H" first="Heinz" last="Rennenberg">Heinz Rennenberg</name></author></analytic><series><title level="j">Journal of experimental botany</title><idno type="eISSN">1460-2431</idno><imprint><date when="2010" type="published">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ascorbic Acid (metabolism)</term><term>Biological Transport (MeSH)</term><term>Glutathione (metabolism)</term><term>Oxidation-Reduction (MeSH)</term><term>Phloem (growth & development)</term><term>Phloem (metabolism)</term><term>Plant Roots (growth & development)</term><term>Plant Roots (metabolism)</term><term>Plant Shoots (growth & development)</term><term>Plant Shoots (metabolism)</term><term>Populus (growth & development)</term><term>Populus (metabolism)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Acide ascorbique (métabolisme)</term><term>Glutathion (métabolisme)</term><term>Oxydoréduction (MeSH)</term><term>Phloème (croissance et développement)</term><term>Phloème (métabolisme)</term><term>Populus (croissance et développement)</term><term>Populus (métabolisme)</term><term>Pousses de plante (croissance et développement)</term><term>Pousses de plante (métabolisme)</term><term>Racines de plante (croissance et développement)</term><term>Racines de plante (métabolisme)</term><term>Transport biologique (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Ascorbic Acid</term><term>Glutathione</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Phloème</term><term>Populus</term><term>Pousses de plante</term><term>Racines de plante</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Phloem</term><term>Plant Roots</term><term>Plant Shoots</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Phloem</term><term>Plant Roots</term><term>Plant Shoots</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Acide ascorbique</term><term>Glutathion</term><term>Phloème</term><term>Populus</term><term>Pousses de plante</term><term>Racines de plante</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Biological Transport</term><term>Oxidation-Reduction</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Oxydoréduction</term><term>Transport biologique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Glutathione (GSH) and ascorbate (ASC) are important antioxidants that are involved in stress defence and cell proliferation of meristematic root cells. In principle, synthesis of ASC and GSH in the roots as well as ASC and GSH transport from the shoot to the roots by phloem mass flow is possible. However, it is not yet known whether the ASC and/or the GSH level in roots depends on the supply from the shoot. This was analysed by feeding mature leaves with [(14)C]ASC or [(35)S]GSH and subsequent detection of the radiolabel in different root fractions. Quantitative dependency of root ASC and GSH on shoot-derived ASC and GSH was investigated with poplar (Populus tremula X P. alba) trees interrupted in phloem transport. [(35)S]GSH is transported from mature leaves to the root tips, but is withdrawn from the phloem along the entire transport path. When phloem transport was interrupted, the GSH content in root tips halved within 3 d. [(14)C]ASC is also transported from mature leaves to the root tips but, in contrast to GSH, ASC is not removed from the phloem along the transport path. Accordingly, ASC accumulates in root tips. Interruption of phloem transport disturbed the level and the ASC redox state within the entire root system. Diminished total ASC levels were attributed mainly to a decline of dehydroascorbate (DHA). As the redox state of ASC is of particular significance for root growth and development, it is concluded that phloem transport of ASC may constitute a shoot to root signal to coordinate growth and development at the whole plant level.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">20022923</PMID><DateCompleted><Year>2010</Year><Month>05</Month><Day>25</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1460-2431</ISSN><JournalIssue CitedMedium="Internet"><Volume>61</Volume><Issue>4</Issue><PubDate><Year>2010</Year><Month>Feb</Month></PubDate></JournalIssue><Title>Journal of experimental botany</Title><ISOAbbreviation>J Exp Bot</ISOAbbreviation></Journal><ArticleTitle>Redox states of glutathione and ascorbate in root tips of poplar (Populus tremula X P. alba) depend on phloem transport from the shoot to the roots.</ArticleTitle><Pagination><MedlinePgn>1065-74</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1093/jxb/erp371</ELocationID><Abstract><AbstractText>Glutathione (GSH) and ascorbate (ASC) are important antioxidants that are involved in stress defence and cell proliferation of meristematic root cells. In principle, synthesis of ASC and GSH in the roots as well as ASC and GSH transport from the shoot to the roots by phloem mass flow is possible. However, it is not yet known whether the ASC and/or the GSH level in roots depends on the supply from the shoot. This was analysed by feeding mature leaves with [(14)C]ASC or [(35)S]GSH and subsequent detection of the radiolabel in different root fractions. Quantitative dependency of root ASC and GSH on shoot-derived ASC and GSH was investigated with poplar (Populus tremula X P. alba) trees interrupted in phloem transport. [(35)S]GSH is transported from mature leaves to the root tips, but is withdrawn from the phloem along the entire transport path. When phloem transport was interrupted, the GSH content in root tips halved within 3 d. [(14)C]ASC is also transported from mature leaves to the root tips but, in contrast to GSH, ASC is not removed from the phloem along the transport path. Accordingly, ASC accumulates in root tips. Interruption of phloem transport disturbed the level and the ASC redox state within the entire root system. Diminished total ASC levels were attributed mainly to a decline of dehydroascorbate (DHA). As the redox state of ASC is of particular significance for root growth and development, it is concluded that phloem transport of ASC may constitute a shoot to root signal to coordinate growth and development at the whole plant level.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Herschbach</LastName><ForeName>Cornelia</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Albert-Ludwigs-University Freiburg, Institute of Forest Botany and Tree Physiology, Chair of Tree Physiology, Georges-Köhler-Allee 053/054, D-79110 Freiburg, Germany. cornelia.herschbach@ctp.uni-freiburg.de</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Scheerer</LastName><ForeName>Ursula</ForeName><Initials>U</Initials></Author><Author ValidYN="Y"><LastName>Rennenberg</LastName><ForeName>Heinz</ForeName><Initials>H</Initials></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>2009</Year><Month>12</Month><Day>18</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>J Exp Bot</MedlineTA><NlmUniqueID>9882906</NlmUniqueID><ISSNLinking>0022-0957</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>GAN16C9B8O</RegistryNumber><NameOfSubstance UI="D005978">Glutathione</NameOfSubstance></Chemical><Chemical><RegistryNumber>PQ6CK8PD0R</RegistryNumber><NameOfSubstance UI="D001205">Ascorbic Acid</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001205" MajorTopicYN="N">Ascorbic Acid</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D001692" MajorTopicYN="N">Biological Transport</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D005978" MajorTopicYN="N">Glutathione</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010084" MajorTopicYN="N">Oxidation-Reduction</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D052585" MajorTopicYN="N">Phloem</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="N">growth & development</QualifierName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="N">growth & development</QualifierName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018520" MajorTopicYN="N">Plant Shoots</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="N">growth & 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