Responses of Aspen Leaves to Heatflecks: Both Damaging and Non-Damaging Rapid Temperature Excursions Reduce Photosynthesis.
Identifieur interne : 000731 ( Main/Exploration ); précédent : 000730; suivant : 000732Responses of Aspen Leaves to Heatflecks: Both Damaging and Non-Damaging Rapid Temperature Excursions Reduce Photosynthesis.
Auteurs : Katja Hüve [Estonie] ; Irina Bichele [Estonie] ; Hedi Kaldm E [Estonie] ; Bahtijor Rasulov [Estonie] ; Fernando Valladares [Espagne] ; Ülo Niinemets [Estonie]Source :
- Plants (Basel, Switzerland) [ 2223-7747 ] ; 2019.
Abstract
During exposure to direct sunlight, leaf temperature increases rapidly and can reach values well above air temperature in temperate forest understories, especially when transpiration is limited due to drought stress, but the physiological effects of such high-temperature events are imperfectly understood. To gain insight into leaf temperature changes in the field and the effects of temperature variation on plant photosynthetic processes, we studied leaf temperature dynamics under field conditions in European aspen (Populus tremula L.) and under nursery conditions in hybrid aspen (P. tremula × P. tremuloides Michaux), and further investigated the heat response of photosynthetic activity in hybrid aspen leaves under laboratory conditions. To simulate the complex fluctuating temperature environment in the field, intact, attached leaves were subjected to short temperature increases ("heat pulses") of varying duration over the temperature range of 30 °C-53 °C either under constant light intensity or by simultaneously raising the light intensity from 600 μmol m-2 s-1 to 1000 μmol m-2 s-1 during the heat pulse. On a warm summer day, leaf temperatures of up to 44 °C were measured in aspen leaves growing in the hemiboreal climate of Estonia. Laboratory experiments demonstrated that a moderate heat pulse of 2 min and up to 44 °C resulted in a reversible decrease of photosynthesis. The decrease in photosynthesis resulted from a combination of suppression of photosynthesis directly caused by the heat pulse and a further decrease, for a time period of 10-40 min after the heat pulse, caused by subsequent transient stomatal closure and delayed recovery of photosystem II (PSII) quantum yield. Longer and hotter heat pulses resulted in sustained inhibition of photosynthesis, primarily due to reduced PSII activity. However, cellular damage as indicated by increased membrane conductivity was not found below 50 °C. These data demonstrate that aspen is remarkably resistant to short-term heat pulses that are frequent under strongly fluctuating light regimes. Although the heat pulses did not result in cellular damage, heatflecks can significantly reduce the whole plant carbon gain in the field due to the delayed photosynthetic recovery after the heat pulse.
DOI: 10.3390/plants8060145
PubMed: 31151267
PubMed Central: PMC6630322
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Ostwaldi 1, 50411 Tartu, Estonia. irina.bichele@ut.ee.</nlm:affiliation><country xml:lang="fr">Estonie</country><wicri:regionArea>Institute of Physics, University of Tartu, W. 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To gain insight into leaf temperature changes in the field and the effects of temperature variation on plant photosynthetic processes, we studied leaf temperature dynamics under field conditions in European aspen (<i>Populus tremula</i> L.) and under nursery conditions in hybrid aspen (<i>P. tremula</i> × <i>P. tremuloides</i> Michaux), and further investigated the heat response of photosynthetic activity in hybrid aspen leaves under laboratory conditions. To simulate the complex fluctuating temperature environment in the field, intact, attached leaves were subjected to short temperature increases ("heat pulses") of varying duration over the temperature range of 30 °C-53 °C either under constant light intensity or by simultaneously raising the light intensity from 600 μmol m<sup>-2</sup> s<sup>-1</sup> to 1000 μmol m<sup>-2</sup> s<sup>-1</sup> during the heat pulse. On a warm summer day, leaf temperatures of up to 44 °C were measured in aspen leaves growing in the hemiboreal climate of Estonia. Laboratory experiments demonstrated that a moderate heat pulse of 2 min and up to 44 °C resulted in a reversible decrease of photosynthesis. The decrease in photosynthesis resulted from a combination of suppression of photosynthesis directly caused by the heat pulse and a further decrease, for a time period of 10-40 min after the heat pulse, caused by subsequent transient stomatal closure and delayed recovery of photosystem II (PSII) quantum yield. Longer and hotter heat pulses resulted in sustained inhibition of photosynthesis, primarily due to reduced PSII activity. However, cellular damage as indicated by increased membrane conductivity was not found below 50 °C. These data demonstrate that aspen is remarkably resistant to short-term heat pulses that are frequent under strongly fluctuating light regimes. Although the heat pulses did not result in cellular damage, heatflecks can significantly reduce the whole plant carbon gain in the field due to the delayed photosynthetic recovery after the heat pulse.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">31151267</PMID><DateRevised><Year>2020</Year><Month>10</Month><Day>01</Day></DateRevised><Article PubModel="Electronic"><Journal><ISSN IssnType="Print">2223-7747</ISSN><JournalIssue CitedMedium="Print"><Volume>8</Volume><Issue>6</Issue><PubDate><Year>2019</Year><Month>May</Month><Day>30</Day></PubDate></JournalIssue><Title>Plants (Basel, Switzerland)</Title><ISOAbbreviation>Plants (Basel)</ISOAbbreviation></Journal><ArticleTitle>Responses of Aspen Leaves to Heatflecks: Both Damaging and Non-Damaging Rapid Temperature Excursions Reduce Photosynthesis.</ArticleTitle><ELocationID EIdType="pii" ValidYN="Y">E145</ELocationID><ELocationID EIdType="doi" ValidYN="Y">10.3390/plants8060145</ELocationID><Abstract><AbstractText>During exposure to direct sunlight, leaf temperature increases rapidly and can reach values well above air temperature in temperate forest understories, especially when transpiration is limited due to drought stress, but the physiological effects of such high-temperature events are imperfectly understood. To gain insight into leaf temperature changes in the field and the effects of temperature variation on plant photosynthetic processes, we studied leaf temperature dynamics under field conditions in European aspen (<i>Populus tremula</i> L.) and under nursery conditions in hybrid aspen (<i>P. tremula</i> × <i>P. tremuloides</i> Michaux), and further investigated the heat response of photosynthetic activity in hybrid aspen leaves under laboratory conditions. To simulate the complex fluctuating temperature environment in the field, intact, attached leaves were subjected to short temperature increases ("heat pulses") of varying duration over the temperature range of 30 °C-53 °C either under constant light intensity or by simultaneously raising the light intensity from 600 μmol m<sup>-2</sup> s<sup>-1</sup> to 1000 μmol m<sup>-2</sup> s<sup>-1</sup> during the heat pulse. On a warm summer day, leaf temperatures of up to 44 °C were measured in aspen leaves growing in the hemiboreal climate of Estonia. Laboratory experiments demonstrated that a moderate heat pulse of 2 min and up to 44 °C resulted in a reversible decrease of photosynthesis. The decrease in photosynthesis resulted from a combination of suppression of photosynthesis directly caused by the heat pulse and a further decrease, for a time period of 10-40 min after the heat pulse, caused by subsequent transient stomatal closure and delayed recovery of photosystem II (PSII) quantum yield. Longer and hotter heat pulses resulted in sustained inhibition of photosynthesis, primarily due to reduced PSII activity. However, cellular damage as indicated by increased membrane conductivity was not found below 50 °C. These data demonstrate that aspen is remarkably resistant to short-term heat pulses that are frequent under strongly fluctuating light regimes. Although the heat pulses did not result in cellular damage, heatflecks can significantly reduce the whole plant carbon gain in the field due to the delayed photosynthetic recovery after the heat pulse.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Hüve</LastName><ForeName>Katja</ForeName><Initials>K</Initials><AffiliationInfo><Affiliation>Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia. shueve@gmx.de.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Bichele</LastName><ForeName>Irina</ForeName><Initials>I</Initials><AffiliationInfo><Affiliation>Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia. irina.bichele@ut.ee.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kaldmäe</LastName><ForeName>Hedi</ForeName><Initials>H</Initials><Identifier Source="ORCID">0000-0003-2210-4903</Identifier><AffiliationInfo><Affiliation>Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia. hedi.kaldmae@emu.ee.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Rasulov</LastName><ForeName>Bahtijor</ForeName><Initials>B</Initials><AffiliationInfo><Affiliation>Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia. bahtijor@ut.ee.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Valladares</LastName><ForeName>Fernando</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>Museo Nacional de Ciencias Naturales, C.S.I.C., Serrano 115 dpdo, E-28006 Madrid, Spain. valladares@ccma.csic.es.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Niinemets</LastName><ForeName>Ülo</ForeName><Initials>Ü</Initials><Identifier Source="ORCID">0000-0002-3078-2192</Identifier><AffiliationInfo><Affiliation>Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia. ylo.niinemets@emu.ee.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia. ylo.niinemets@emu.ee.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><GrantList CompleteYN="Y"><Grant><GrantID>PRG537</GrantID><Agency>Eesti Teadusagentuur</Agency><Country></Country></Grant><Grant><GrantID>Centre of Excellence EcolChange</GrantID><Agency>European Regional Development Fund</Agency><Country></Country></Grant></GrantList><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2019</Year><Month>05</Month><Day>30</Day></ArticleDate></Article><MedlineJournalInfo><Country>Switzerland</Country><MedlineTA>Plants (Basel)</MedlineTA><NlmUniqueID>101596181</NlmUniqueID><ISSNLinking>2223-7747</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Populus</Keyword><Keyword MajorTopicYN="N">heat stress</Keyword><Keyword MajorTopicYN="N">hybrid aspen</Keyword><Keyword MajorTopicYN="N">leaf temperature</Keyword><Keyword MajorTopicYN="N">photosynthesis inhibition</Keyword><Keyword MajorTopicYN="N">photosystem II</Keyword><Keyword MajorTopicYN="N">stomatal conductance</Keyword><Keyword MajorTopicYN="N">sunflecks</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2019</Year><Month>05</Month><Day>02</Day></PubMedPubDate><PubMedPubDate 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sortKey="Kaldm E, Hedi" sort="Kaldm E, Hedi" uniqKey="Kaldm E H" first="Hedi" last="Kaldm E">Hedi Kaldm E</name><name sortKey="Niinemets, Ulo" sort="Niinemets, Ulo" uniqKey="Niinemets U" first="Ülo" last="Niinemets">Ülo Niinemets</name><name sortKey="Niinemets, Ulo" sort="Niinemets, Ulo" uniqKey="Niinemets U" first="Ülo" last="Niinemets">Ülo Niinemets</name><name sortKey="Rasulov, Bahtijor" sort="Rasulov, Bahtijor" uniqKey="Rasulov B" first="Bahtijor" last="Rasulov">Bahtijor Rasulov</name></country><country name="Espagne"><region name="Communauté de Madrid"><name sortKey="Valladares, Fernando" sort="Valladares, Fernando" uniqKey="Valladares F" first="Fernando" last="Valladares">Fernando Valladares</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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