Characteristics of electrical signals in poplar and responses in photosynthesis.
Identifieur interne : 004090 ( Main/Exploration ); précédent : 004089; suivant : 004091Characteristics of electrical signals in poplar and responses in photosynthesis.
Auteurs : Silke Lautner [Allemagne] ; Thorsten Erhard Edgar Grams ; Rainer Matyssek ; Jörg FrommSource :
- Plant physiology [ 0032-0889 ] ; 2005.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Chlorophylle, Feuilles de plante.
- physiologie : Photosynthèse, Populus, Pousses de plante, Transduction du signal.
- Basse température, Potentiels de membrane, Électrophysiologie.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Chlorophyll.
- metabolism : Plant Leaves.
- physiology : Photosynthesis, Plant Shoots, Populus, Signal Transduction.
- Cold Temperature, Electrophysiology, Membrane Potentials.
Abstract
To gain an understanding of the role of electrical signaling in trees, poplar (Populus trichocarpa, Populus tremula x P. tremuloides) shoots were stimulated by chilling as well as flaming. Two kinds of signal propagation were detected by microelectrode measurements (aphid technique) in the phloem of leaf veins: (1) basipetal, short-distance signaling that led to rapid membrane hyperpolarization caused by K+-efflux within the leaf lamina; and (2) acropetal, long-distance signaling that triggered depolarization of the membrane potential in the leaf phloem. In the latter, the depolarizing signals travel across the stem from the manipulated leaves to adjacent leaves where the net CO2 uptake rate is temporarily depressed toward compensation. With regard to photosystem II, both heat-induced long-distance and short-distance signaling were investigated using two-dimensional "imaging" analysis of chlorophyll fluorescence. Both types of signaling significantly reduced the quantum yield of electron transport through photosystem II. Imaging analysis revealed that the signal that causes yield reduction spreads through the leaf lamina. Coldblocking of the stem proved that the electrical signal transmission via the phloem becomes disrupted, causing the leaf gas exchange to remain unaffected. Calcium-deficient trees showed a marked contrast inasmuch as the amplitude of the electrical signal was distinctly reduced, concomitant with the absence of a significant response in leaf gas exchange upon flame wounding. In summary, the above results led us to conclude that calcium as well as potassium is involved in the propagation of phloem-transmitted electrical signals that evoke specific responses in the photosynthesis of leaves.
DOI: 10.1104/pp.105.064196
PubMed: 16040648
PubMed Central: PMC1183407
Affiliations:
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(MeSH)</term><term>Chlorophylle (métabolisme)</term><term>Feuilles de plante (métabolisme)</term><term>Photosynthèse (physiologie)</term><term>Populus (physiologie)</term><term>Potentiels de membrane (MeSH)</term><term>Pousses de plante (physiologie)</term><term>Transduction du signal (physiologie)</term><term>Électrophysiologie (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Chlorophyll</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Plant Leaves</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Chlorophylle</term><term>Feuilles de plante</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Photosynthèse</term><term>Populus</term><term>Pousses de plante</term><term>Transduction du signal</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Photosynthesis</term><term>Plant Shoots</term><term>Populus</term><term>Signal Transduction</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Cold Temperature</term><term>Electrophysiology</term><term>Membrane Potentials</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Basse température</term><term>Potentiels de membrane</term><term>Électrophysiologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">To gain an understanding of the role of electrical signaling in trees, poplar (Populus trichocarpa, Populus tremula x P. tremuloides) shoots were stimulated by chilling as well as flaming. Two kinds of signal propagation were detected by microelectrode measurements (aphid technique) in the phloem of leaf veins: (1) basipetal, short-distance signaling that led to rapid membrane hyperpolarization caused by K+-efflux within the leaf lamina; and (2) acropetal, long-distance signaling that triggered depolarization of the membrane potential in the leaf phloem. In the latter, the depolarizing signals travel across the stem from the manipulated leaves to adjacent leaves where the net CO2 uptake rate is temporarily depressed toward compensation. With regard to photosystem II, both heat-induced long-distance and short-distance signaling were investigated using two-dimensional "imaging" analysis of chlorophyll fluorescence. Both types of signaling significantly reduced the quantum yield of electron transport through photosystem II. Imaging analysis revealed that the signal that causes yield reduction spreads through the leaf lamina. Coldblocking of the stem proved that the electrical signal transmission via the phloem becomes disrupted, causing the leaf gas exchange to remain unaffected. Calcium-deficient trees showed a marked contrast inasmuch as the amplitude of the electrical signal was distinctly reduced, concomitant with the absence of a significant response in leaf gas exchange upon flame wounding. In summary, the above results led us to conclude that calcium as well as potassium is involved in the propagation of phloem-transmitted electrical signals that evoke specific responses in the photosynthesis of leaves.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">16040648</PMID><DateCompleted><Year>2005</Year><Month>12</Month><Day>23</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0032-0889</ISSN><JournalIssue CitedMedium="Print"><Volume>138</Volume><Issue>4</Issue><PubDate><Year>2005</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Plant physiology</Title><ISOAbbreviation>Plant Physiol</ISOAbbreviation></Journal><ArticleTitle>Characteristics of electrical signals in poplar and responses in photosynthesis.</ArticleTitle><Pagination><MedlinePgn>2200-9</MedlinePgn></Pagination><Abstract><AbstractText>To gain an understanding of the role of electrical signaling in trees, poplar (Populus trichocarpa, Populus tremula x P. tremuloides) shoots were stimulated by chilling as well as flaming. Two kinds of signal propagation were detected by microelectrode measurements (aphid technique) in the phloem of leaf veins: (1) basipetal, short-distance signaling that led to rapid membrane hyperpolarization caused by K+-efflux within the leaf lamina; and (2) acropetal, long-distance signaling that triggered depolarization of the membrane potential in the leaf phloem. In the latter, the depolarizing signals travel across the stem from the manipulated leaves to adjacent leaves where the net CO2 uptake rate is temporarily depressed toward compensation. With regard to photosystem II, both heat-induced long-distance and short-distance signaling were investigated using two-dimensional "imaging" analysis of chlorophyll fluorescence. Both types of signaling significantly reduced the quantum yield of electron transport through photosystem II. Imaging analysis revealed that the signal that causes yield reduction spreads through the leaf lamina. Coldblocking of the stem proved that the electrical signal transmission via the phloem becomes disrupted, causing the leaf gas exchange to remain unaffected. Calcium-deficient trees showed a marked contrast inasmuch as the amplitude of the electrical signal was distinctly reduced, concomitant with the absence of a significant response in leaf gas exchange upon flame wounding. In summary, the above results led us to conclude that calcium as well as potassium is involved in the propagation of phloem-transmitted electrical signals that evoke specific responses in the photosynthesis of leaves.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Lautner</LastName><ForeName>Silke</ForeName><Initials>S</Initials><AffiliationInfo><Affiliation>Fachgebiet Angewandte Holzbiologie, Technische Universität München, 80797 Munich, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Grams</LastName><ForeName>Thorsten Erhard Edgar</ForeName><Initials>TE</Initials></Author><Author ValidYN="Y"><LastName>Matyssek</LastName><ForeName>Rainer</ForeName><Initials>R</Initials></Author><Author ValidYN="Y"><LastName>Fromm</LastName><ForeName>Jörg</ForeName><Initials>J</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>2005</Year><Month>07</Month><Day>22</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Physiol</MedlineTA><NlmUniqueID>0401224</NlmUniqueID><ISSNLinking>0032-0889</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>1406-65-1</RegistryNumber><NameOfSubstance UI="D002734">Chlorophyll</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D002734" MajorTopicYN="N">Chlorophyll</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D003080" MajorTopicYN="N">Cold Temperature</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D004594" MajorTopicYN="N">Electrophysiology</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D008564" MajorTopicYN="N">Membrane Potentials</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010788" MajorTopicYN="N">Photosynthesis</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018515" MajorTopicYN="N">Plant Leaves</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018520" MajorTopicYN="N">Plant Shoots</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D015398" MajorTopicYN="N">Signal Transduction</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2005</Year><Month>7</Month><Day>26</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2005</Year><Month>12</Month><Day>24</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2005</Year><Month>7</Month><Day>26</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">16040648</ArticleId><ArticleId IdType="pii">pp.105.064196</ArticleId><ArticleId IdType="doi">10.1104/pp.105.064196</ArticleId><ArticleId IdType="pmc">PMC1183407</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Plant Cell. 1997 Jul;9(7):1181-1195</Citation><ArticleIdList><ArticleId IdType="pubmed">12237382</ArticleId></ArticleIdList></Reference><Reference><Citation>Photosynth Res. 1986 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Jul;187(4):505-10</Citation><ArticleIdList><ArticleId IdType="pubmed">24178145</ArticleId></ArticleIdList></Reference><Reference><Citation>Symp Soc Exp Biol. 1966;20:49-73</Citation><ArticleIdList><ArticleId IdType="pubmed">5958369</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>Allemagne</li></country><region><li>Bavière</li><li>District de Haute-Bavière</li></region><settlement><li>Munich</li></settlement><orgName><li>Université technique de Munich</li></orgName></list><tree><noCountry><name sortKey="Fromm, Jorg" sort="Fromm, Jorg" uniqKey="Fromm J" first="Jörg" last="Fromm">Jörg Fromm</name><name sortKey="Grams, Thorsten Erhard Edgar" sort="Grams, Thorsten Erhard Edgar" uniqKey="Grams T" first="Thorsten Erhard Edgar" last="Grams">Thorsten Erhard Edgar Grams</name><name sortKey="Matyssek, Rainer" sort="Matyssek, Rainer" uniqKey="Matyssek R" first="Rainer" last="Matyssek">Rainer Matyssek</name></noCountry><country name="Allemagne"><region name="Bavière"><name sortKey="Lautner, Silke" sort="Lautner, Silke" uniqKey="Lautner S" first="Silke" last="Lautner">Silke Lautner</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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