Populus species from diverse habitats maintain high night-time conductance under drought.
Identifieur interne : 001709 ( Main/Exploration ); précédent : 001708; suivant : 001710Populus species from diverse habitats maintain high night-time conductance under drought.
Auteurs : Damián Cirelli [Canada] ; María Alejandra Equiza [Canada] ; Victor James Lieffers [Canada] ; Melvin Thomas Tyree [République populaire de Chine]Source :
- Tree physiology [ 1758-4469 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
- physiologie : Plant, Populus, Stomates de plante.
- Rythme circadien, Spécificité d'espèce, Sécheresses, Transpiration des plantes, Écosystème.
English descriptors
- KwdEn :
- MESH :
- physiology : Plant Stomata, Populus, Seedlings.
- Circadian Rhythm, Droughts, Ecosystem, Plant Transpiration, Species Specificity.
Abstract
We investigated the interspecific variability in nocturnal whole-plant stomatal conductance under well-watered and drought conditions in seedlings of four species of Populus from habitats characterized by abundant water supply (mesic and riparian) or from drier upland sites. The study was carried out to determine whether (i) nocturnal conductance varies across different species of Populus according to their natural habitat, (ii) nocturnal conductance is affected by water stress similarly to daytime conductance based on species habitat and (iii) differences in conductance among species could be explained partly by differences in stomatal traits. We measured whole-plant transpiration and conductance (G) of greenhouse-grown seedlings using an automated high-resolution gravimetric technique. No relationship was found between habitat preference and daytime G (GD), but night-time G (GN) was on average 1.5 times higher in riparian and mesic species (P. deltoides Bartr. ex Marsh. and P. trichocarpa Torr. & Gray) than in those from drier environments (P. tremuloides Michx. and P. × petrowskyana Schr.). GN was not significantly reduced under drought in riparian species. Upland species restricted GN significantly in response to drought, but it was still at least one order of magnitude greater that the cuticular conductance until leaf death was imminent. Under both well-watered and drought conditions, GN declined with increasing vapour pressure deficit (D). Also, a small increase in GN towards the end of the night period was observed in P. deltoides and P. × petrowskyana, suggesting the involvement of endogenous regulation. The anatomical analyses indicated a positive correlation between G and variable stomatal pore index among species and revealed that stomata are not likely to be leaky but instead seem capable of complete occlusion, which raises the question of the possible physiological role of the significant GN observed under drought. Further comparisons among closely related species that occupy ecologically diverse habitats may provide a better understanding of the genetic versus environmental regulations of nocturnal water loss.
DOI: 10.1093/treephys/tpv092
PubMed: 26420792
Affiliations:
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Forestry, Northwest A&F University, Yangling, Shaanxi</wicri:regionArea><wicri:noRegion>Shaanxi</wicri:noRegion></affiliation></author></analytic><series><title level="j">Tree physiology</title><idno type="eISSN">1758-4469</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Circadian Rhythm (MeSH)</term><term>Droughts (MeSH)</term><term>Ecosystem (MeSH)</term><term>Plant Stomata (physiology)</term><term>Plant Transpiration (MeSH)</term><term>Populus (physiology)</term><term>Seedlings (physiology)</term><term>Species Specificity (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Plant (physiologie)</term><term>Populus (physiologie)</term><term>Rythme circadien (MeSH)</term><term>Spécificité d'espèce (MeSH)</term><term>Stomates de plante (physiologie)</term><term>Sécheresses (MeSH)</term><term>Transpiration des plantes (MeSH)</term><term>Écosystème (MeSH)</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Plant</term><term>Populus</term><term>Stomates de plante</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stomata</term><term>Populus</term><term>Seedlings</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Circadian Rhythm</term><term>Droughts</term><term>Ecosystem</term><term>Plant Transpiration</term><term>Species Specificity</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Rythme circadien</term><term>Spécificité d'espèce</term><term>Sécheresses</term><term>Transpiration des plantes</term><term>Écosystème</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We investigated the interspecific variability in nocturnal whole-plant stomatal conductance under well-watered and drought conditions in seedlings of four species of Populus from habitats characterized by abundant water supply (mesic and riparian) or from drier upland sites. The study was carried out to determine whether (i) nocturnal conductance varies across different species of Populus according to their natural habitat, (ii) nocturnal conductance is affected by water stress similarly to daytime conductance based on species habitat and (iii) differences in conductance among species could be explained partly by differences in stomatal traits. We measured whole-plant transpiration and conductance (G) of greenhouse-grown seedlings using an automated high-resolution gravimetric technique. No relationship was found between habitat preference and daytime G (GD), but night-time G (GN) was on average 1.5 times higher in riparian and mesic species (P. deltoides Bartr. ex Marsh. and P. trichocarpa Torr. & Gray) than in those from drier environments (P. tremuloides Michx. and P. × petrowskyana Schr.). GN was not significantly reduced under drought in riparian species. Upland species restricted GN significantly in response to drought, but it was still at least one order of magnitude greater that the cuticular conductance until leaf death was imminent. Under both well-watered and drought conditions, GN declined with increasing vapour pressure deficit (D). Also, a small increase in GN towards the end of the night period was observed in P. deltoides and P. × petrowskyana, suggesting the involvement of endogenous regulation. The anatomical analyses indicated a positive correlation between G and variable stomatal pore index among species and revealed that stomata are not likely to be leaky but instead seem capable of complete occlusion, which raises the question of the possible physiological role of the significant GN observed under drought. Further comparisons among closely related species that occupy ecologically diverse habitats may provide a better understanding of the genetic versus environmental regulations of nocturnal water loss. </div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">26420792</PMID><DateCompleted><Year>2016</Year><Month>11</Month><Day>02</Day></DateCompleted><DateRevised><Year>2016</Year><Month>12</Month><Day>30</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1758-4469</ISSN><JournalIssue CitedMedium="Internet"><Volume>36</Volume><Issue>2</Issue><PubDate><Year>2016</Year><Month>Feb</Month></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Populus species from diverse habitats maintain high night-time conductance under drought.</ArticleTitle><Pagination><MedlinePgn>229-42</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1093/treephys/tpv092</ELocationID><Abstract><AbstractText>We investigated the interspecific variability in nocturnal whole-plant stomatal conductance under well-watered and drought conditions in seedlings of four species of Populus from habitats characterized by abundant water supply (mesic and riparian) or from drier upland sites. The study was carried out to determine whether (i) nocturnal conductance varies across different species of Populus according to their natural habitat, (ii) nocturnal conductance is affected by water stress similarly to daytime conductance based on species habitat and (iii) differences in conductance among species could be explained partly by differences in stomatal traits. We measured whole-plant transpiration and conductance (G) of greenhouse-grown seedlings using an automated high-resolution gravimetric technique. No relationship was found between habitat preference and daytime G (GD), but night-time G (GN) was on average 1.5 times higher in riparian and mesic species (P. deltoides Bartr. ex Marsh. and P. trichocarpa Torr. & Gray) than in those from drier environments (P. tremuloides Michx. and P. × petrowskyana Schr.). GN was not significantly reduced under drought in riparian species. Upland species restricted GN significantly in response to drought, but it was still at least one order of magnitude greater that the cuticular conductance until leaf death was imminent. Under both well-watered and drought conditions, GN declined with increasing vapour pressure deficit (D). Also, a small increase in GN towards the end of the night period was observed in P. deltoides and P. × petrowskyana, suggesting the involvement of endogenous regulation. The anatomical analyses indicated a positive correlation between G and variable stomatal pore index among species and revealed that stomata are not likely to be leaky but instead seem capable of complete occlusion, which raises the question of the possible physiological role of the significant GN observed under drought. Further comparisons among closely related species that occupy ecologically diverse habitats may provide a better understanding of the genetic versus environmental regulations of nocturnal water loss. </AbstractText><CopyrightInformation>© The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Cirelli</LastName><ForeName>Damián</ForeName><Initials>D</Initials><AffiliationInfo><Affiliation>Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada cirelli@ualberta.ca.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Equiza</LastName><ForeName>María Alejandra</ForeName><Initials>MA</Initials><AffiliationInfo><Affiliation>Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lieffers</LastName><ForeName>Victor James</ForeName><Initials>VJ</Initials><AffiliationInfo><Affiliation>Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Tyree</LastName><ForeName>Melvin Thomas</ForeName><Initials>MT</Initials><AffiliationInfo><Affiliation>College of Forestry, Northwest A&F University, Yangling, Shaanxi, China.</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>2015</Year><Month>09</Month><Day>28</Day></ArticleDate></Article><MedlineJournalInfo><Country>Canada</Country><MedlineTA>Tree Physiol</MedlineTA><NlmUniqueID>100955338</NlmUniqueID><ISSNLinking>0829-318X</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D002940" MajorTopicYN="N">Circadian Rhythm</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D055864" MajorTopicYN="Y">Droughts</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D017753" MajorTopicYN="Y">Ecosystem</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D054046" MajorTopicYN="N">Plant Stomata</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018526" MajorTopicYN="Y">Plant Transpiration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D036226" MajorTopicYN="N">Seedlings</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D013045" MajorTopicYN="N">Species Specificity</DescriptorName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">aspen</Keyword><Keyword MajorTopicYN="N">night-time transpiration</Keyword><Keyword MajorTopicYN="N">riparian</Keyword><Keyword MajorTopicYN="N">stomatal conductance</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2014</Year><Month>12</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2015</Year><Month>08</Month><Day>17</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2015</Year><Month>10</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>10</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2016</Year><Month>11</Month><Day>3</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26420792</ArticleId><ArticleId IdType="pii">tpv092</ArticleId><ArticleId IdType="doi">10.1093/treephys/tpv092</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Canada</li><li>République populaire de Chine</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Cirelli, Damian" sort="Cirelli, Damian" uniqKey="Cirelli D" first="Damián" last="Cirelli">Damián Cirelli</name></noRegion><name sortKey="Equiza, Maria Alejandra" sort="Equiza, Maria Alejandra" uniqKey="Equiza M" first="María Alejandra" last="Equiza">María Alejandra Equiza</name><name sortKey="Lieffers, Victor James" sort="Lieffers, Victor James" uniqKey="Lieffers V" first="Victor James" last="Lieffers">Victor James Lieffers</name></country><country name="République populaire de Chine"><noRegion><name sortKey="Tyree, Melvin Thomas" sort="Tyree, Melvin Thomas" uniqKey="Tyree M" first="Melvin Thomas" last="Tyree">Melvin Thomas Tyree</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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