Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland.
Identifieur interne : 003903 ( Main/Corpus ); précédent : 003902; suivant : 003904Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland.
Auteurs : Matthew G. Letts ; Colleen A. Phelan ; Davin R E. Johnson ; Stewart B. RoodSource :
- Tree physiology [ 0829-318X ] ; 2008.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Chlorophyll.
- chemical : Carbon Isotopes.
- geographic : Alberta.
- metabolism : Plant Leaves, Populus, Trees.
- physiology : Photosynthesis, Plant Leaves, Populus, Trees.
- Ecosystem, Seasons.
Abstract
Cottonwoods (Populus spp.) are dioecious phreatophytes of hydrological and ecological importance in riparian woodlands throughout the Northern Hemisphere. In streamside zones of southern Alberta, groundwater and soil water typically decline between May and September. To understand how narrowleaf cottonwoods (Populus angustifolia James) are adapted to this seasonal decrease in water availability, we measured photosynthetic gas exchange, leaf reflectance, chlorophyll fluorescence and stable carbon isotope composition (delta(13)C) in trees growing in the Oldman River valley of southern Alberta during the 2006 growth season. Accompanying the seasonal recession in river flow, groundwater table depth (Z(gw)) declined by 1.6 m, but neither mean daily light-saturated net photosynthetic rate (A(max)) nor stomatal conductance (g(s)) was correlated with this change. Both A(max) and g(s) followed a parabolic seasonal pattern, with July 24 maxima of 15.8 micromol m(-2) s(-1) and 559 mmol m(-2) s(-1), respectively. The early summer rise in A(max) was related to an increase in the chlorophyll pool during leaf development. Peak A(max) coincided with the maximum quantum efficiency of Photosystem II (F(v)/F(m)), chlorophyll index (CI) and scaled photochemical reflectance index (sPRI), but occurred one month after maximum volumetric soil water (theta(v)) and minimum Z(gw). In late summer, A(max) decreased by 30-40% from maximum values, in weak correlation with theta(v) (r(2) = 0.50). Groundwater availability limited late-season water stress, so that there was little variation in mean daily transpiration (E). Decreasing leaf nitrogen (% dry mass), CI, F(v)/F(m) and normalized difference vegetation index (NDVI) were also consistent with leaf aging effects. There was a strong correlation between A(max) and g(s) (r(2) = 0.89), so that photosynthetic water-use efficiency (WUE; A(max)/E) decreased logarithmically with increasing vapor pressure deficit in both males (r(2) = 0.75) and females (r(2) = 0.95). The male:female ratio was unequal (2:1, chi(2) = 16.5, P < 0.001) at the study site, but we found no significant between-sex differences in photosynthetic gas exchange, leaf reflectance or chlorophyll fluorescence that might explain the unequal ratio. Females tended to display lower NDVI than males (P = 0.07), but mean WUE did not differ significantly between males and females (2.1 +/- 0.2 versus 2.5 +/- 0.2 mmol mol(-1)), and delta(13)C remained in the -28.8 to -29.3 per thousand range throughout the growth season, in both sexes. These results demonstrate changes in photosynthetic and water-use characteristics that collectively enable vigorous growth throughout the season, despite seasonal changes in water supply and demand.
DOI: 10.1093/treephys/28.7.1037
PubMed: 18450568
Links to Exploration step
pubmed:18450568Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland.</title>
<author><name sortKey="Letts, Matthew G" sort="Letts, Matthew G" uniqKey="Letts M" first="Matthew G" last="Letts">Matthew G. Letts</name>
<affiliation><nlm:affiliation>Department of Geography, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada. matthew.letts@uleth.ca</nlm:affiliation>
</affiliation>
</author>
<author><name sortKey="Phelan, Colleen A" sort="Phelan, Colleen A" uniqKey="Phelan C" first="Colleen A" last="Phelan">Colleen A. Phelan</name>
</author>
<author><name sortKey="Johnson, Davin R E" sort="Johnson, Davin R E" uniqKey="Johnson D" first="Davin R E" last="Johnson">Davin R E. Johnson</name>
</author>
<author><name sortKey="Rood, Stewart B" sort="Rood, Stewart B" uniqKey="Rood S" first="Stewart B" last="Rood">Stewart B. Rood</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PubMed</idno>
<date when="2008">2008</date>
<idno type="RBID">pubmed:18450568</idno>
<idno type="pmid">18450568</idno>
<idno type="doi">10.1093/treephys/28.7.1037</idno>
<idno type="wicri:Area/Main/Corpus">003903</idno>
<idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">003903</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en">Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland.</title>
<author><name sortKey="Letts, Matthew G" sort="Letts, Matthew G" uniqKey="Letts M" first="Matthew G" last="Letts">Matthew G. Letts</name>
<affiliation><nlm:affiliation>Department of Geography, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada. matthew.letts@uleth.ca</nlm:affiliation>
</affiliation>
</author>
<author><name sortKey="Phelan, Colleen A" sort="Phelan, Colleen A" uniqKey="Phelan C" first="Colleen A" last="Phelan">Colleen A. Phelan</name>
</author>
<author><name sortKey="Johnson, Davin R E" sort="Johnson, Davin R E" uniqKey="Johnson D" first="Davin R E" last="Johnson">Davin R E. Johnson</name>
</author>
<author><name sortKey="Rood, Stewart B" sort="Rood, Stewart B" uniqKey="Rood S" first="Stewart B" last="Rood">Stewart B. Rood</name>
</author>
</analytic>
<series><title level="j">Tree physiology</title>
<idno type="ISSN">0829-318X</idno>
<imprint><date when="2008" type="published">2008</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alberta (MeSH)</term>
<term>Carbon Isotopes (MeSH)</term>
<term>Chlorophyll (metabolism)</term>
<term>Ecosystem (MeSH)</term>
<term>Photosynthesis (physiology)</term>
<term>Plant Leaves (metabolism)</term>
<term>Plant Leaves (physiology)</term>
<term>Populus (metabolism)</term>
<term>Populus (physiology)</term>
<term>Seasons (MeSH)</term>
<term>Trees (metabolism)</term>
<term>Trees (physiology)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Chlorophyll</term>
</keywords>
<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Carbon Isotopes</term>
</keywords>
<keywords scheme="MESH" type="geographic" xml:lang="en"><term>Alberta</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Plant Leaves</term>
<term>Populus</term>
<term>Trees</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Photosynthesis</term>
<term>Plant Leaves</term>
<term>Populus</term>
<term>Trees</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Ecosystem</term>
<term>Seasons</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Cottonwoods (Populus spp.) are dioecious phreatophytes of hydrological and ecological importance in riparian woodlands throughout the Northern Hemisphere. In streamside zones of southern Alberta, groundwater and soil water typically decline between May and September. To understand how narrowleaf cottonwoods (Populus angustifolia James) are adapted to this seasonal decrease in water availability, we measured photosynthetic gas exchange, leaf reflectance, chlorophyll fluorescence and stable carbon isotope composition (delta(13)C) in trees growing in the Oldman River valley of southern Alberta during the 2006 growth season. Accompanying the seasonal recession in river flow, groundwater table depth (Z(gw)) declined by 1.6 m, but neither mean daily light-saturated net photosynthetic rate (A(max)) nor stomatal conductance (g(s)) was correlated with this change. Both A(max) and g(s) followed a parabolic seasonal pattern, with July 24 maxima of 15.8 micromol m(-2) s(-1) and 559 mmol m(-2) s(-1), respectively. The early summer rise in A(max) was related to an increase in the chlorophyll pool during leaf development. Peak A(max) coincided with the maximum quantum efficiency of Photosystem II (F(v)/F(m)), chlorophyll index (CI) and scaled photochemical reflectance index (sPRI), but occurred one month after maximum volumetric soil water (theta(v)) and minimum Z(gw). In late summer, A(max) decreased by 30-40% from maximum values, in weak correlation with theta(v) (r(2) = 0.50). Groundwater availability limited late-season water stress, so that there was little variation in mean daily transpiration (E). Decreasing leaf nitrogen (% dry mass), CI, F(v)/F(m) and normalized difference vegetation index (NDVI) were also consistent with leaf aging effects. There was a strong correlation between A(max) and g(s) (r(2) = 0.89), so that photosynthetic water-use efficiency (WUE; A(max)/E) decreased logarithmically with increasing vapor pressure deficit in both males (r(2) = 0.75) and females (r(2) = 0.95). The male:female ratio was unequal (2:1, chi(2) = 16.5, P < 0.001) at the study site, but we found no significant between-sex differences in photosynthetic gas exchange, leaf reflectance or chlorophyll fluorescence that might explain the unequal ratio. Females tended to display lower NDVI than males (P = 0.07), but mean WUE did not differ significantly between males and females (2.1 +/- 0.2 versus 2.5 +/- 0.2 mmol mol(-1)), and delta(13)C remained in the -28.8 to -29.3 per thousand range throughout the growth season, in both sexes. These results demonstrate changes in photosynthetic and water-use characteristics that collectively enable vigorous growth throughout the season, despite seasonal changes in water supply and demand.</div>
</front>
</TEI>
<pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">18450568</PMID>
<DateCompleted><Year>2008</Year>
<Month>09</Month>
<Day>22</Day>
</DateCompleted>
<DateRevised><Year>2019</Year>
<Month>05</Month>
<Day>13</Day>
</DateRevised>
<Article PubModel="Print"><Journal><ISSN IssnType="Print">0829-318X</ISSN>
<JournalIssue CitedMedium="Print"><Volume>28</Volume>
<Issue>7</Issue>
<PubDate><Year>2008</Year>
<Month>Jul</Month>
</PubDate>
</JournalIssue>
<Title>Tree physiology</Title>
<ISOAbbreviation>Tree Physiol</ISOAbbreviation>
</Journal>
<ArticleTitle>Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland.</ArticleTitle>
<Pagination><MedlinePgn>1037-48</MedlinePgn>
</Pagination>
<Abstract><AbstractText>Cottonwoods (Populus spp.) are dioecious phreatophytes of hydrological and ecological importance in riparian woodlands throughout the Northern Hemisphere. In streamside zones of southern Alberta, groundwater and soil water typically decline between May and September. To understand how narrowleaf cottonwoods (Populus angustifolia James) are adapted to this seasonal decrease in water availability, we measured photosynthetic gas exchange, leaf reflectance, chlorophyll fluorescence and stable carbon isotope composition (delta(13)C) in trees growing in the Oldman River valley of southern Alberta during the 2006 growth season. Accompanying the seasonal recession in river flow, groundwater table depth (Z(gw)) declined by 1.6 m, but neither mean daily light-saturated net photosynthetic rate (A(max)) nor stomatal conductance (g(s)) was correlated with this change. Both A(max) and g(s) followed a parabolic seasonal pattern, with July 24 maxima of 15.8 micromol m(-2) s(-1) and 559 mmol m(-2) s(-1), respectively. The early summer rise in A(max) was related to an increase in the chlorophyll pool during leaf development. Peak A(max) coincided with the maximum quantum efficiency of Photosystem II (F(v)/F(m)), chlorophyll index (CI) and scaled photochemical reflectance index (sPRI), but occurred one month after maximum volumetric soil water (theta(v)) and minimum Z(gw). In late summer, A(max) decreased by 30-40% from maximum values, in weak correlation with theta(v) (r(2) = 0.50). Groundwater availability limited late-season water stress, so that there was little variation in mean daily transpiration (E). Decreasing leaf nitrogen (% dry mass), CI, F(v)/F(m) and normalized difference vegetation index (NDVI) were also consistent with leaf aging effects. There was a strong correlation between A(max) and g(s) (r(2) = 0.89), so that photosynthetic water-use efficiency (WUE; A(max)/E) decreased logarithmically with increasing vapor pressure deficit in both males (r(2) = 0.75) and females (r(2) = 0.95). The male:female ratio was unequal (2:1, chi(2) = 16.5, P < 0.001) at the study site, but we found no significant between-sex differences in photosynthetic gas exchange, leaf reflectance or chlorophyll fluorescence that might explain the unequal ratio. Females tended to display lower NDVI than males (P = 0.07), but mean WUE did not differ significantly between males and females (2.1 +/- 0.2 versus 2.5 +/- 0.2 mmol mol(-1)), and delta(13)C remained in the -28.8 to -29.3 per thousand range throughout the growth season, in both sexes. These results demonstrate changes in photosynthetic and water-use characteristics that collectively enable vigorous growth throughout the season, despite seasonal changes in water supply and demand.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Letts</LastName>
<ForeName>Matthew G</ForeName>
<Initials>MG</Initials>
<AffiliationInfo><Affiliation>Department of Geography, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada. matthew.letts@uleth.ca</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Phelan</LastName>
<ForeName>Colleen A</ForeName>
<Initials>CA</Initials>
</Author>
<Author ValidYN="Y"><LastName>Johnson</LastName>
<ForeName>Davin R E</ForeName>
<Initials>DR</Initials>
</Author>
<Author ValidYN="Y"><LastName>Rood</LastName>
<ForeName>Stewart B</ForeName>
<Initials>SB</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>
</Article>
<MedlineJournalInfo><Country>Canada</Country>
<MedlineTA>Tree Physiol</MedlineTA>
<NlmUniqueID>100955338</NlmUniqueID>
<ISSNLinking>0829-318X</ISSNLinking>
</MedlineJournalInfo>
<ChemicalList><Chemical><RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D002247">Carbon Isotopes</NameOfSubstance>
</Chemical>
<Chemical><RegistryNumber>1406-65-1</RegistryNumber>
<NameOfSubstance UI="D002734">Chlorophyll</NameOfSubstance>
</Chemical>
</ChemicalList>
<CitationSubset>IM</CitationSubset>
<MeshHeadingList><MeshHeading><DescriptorName UI="D000416" MajorTopicYN="N" Type="Geographic">Alberta</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D002247" MajorTopicYN="N">Carbon Isotopes</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D002734" MajorTopicYN="N">Chlorophyll</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D017753" MajorTopicYN="N">Ecosystem</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>
<QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
<QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D012621" MajorTopicYN="Y">Seasons</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D014197" MajorTopicYN="N">Trees</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
</MeshHeadingList>
</MedlineCitation>
<PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2008</Year>
<Month>5</Month>
<Day>3</Day>
<Hour>9</Hour>
<Minute>0</Minute>
</PubMedPubDate>
<PubMedPubDate PubStatus="medline"><Year>2008</Year>
<Month>9</Month>
<Day>23</Day>
<Hour>9</Hour>
<Minute>0</Minute>
</PubMedPubDate>
<PubMedPubDate PubStatus="entrez"><Year>2008</Year>
<Month>5</Month>
<Day>3</Day>
<Hour>9</Hour>
<Minute>0</Minute>
</PubMedPubDate>
</History>
<PublicationStatus>ppublish</PublicationStatus>
<ArticleIdList><ArticleId IdType="pubmed">18450568</ArticleId>
<ArticleId IdType="doi">10.1093/treephys/28.7.1037</ArticleId>
</ArticleIdList>
</PubmedData>
</pubmed>
</record>
Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Bois/explor/PoplarV1/Data/Main/Corpus
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 003903 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Corpus/biblio.hfd -nk 003903 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien |wiki= Bois |area= PoplarV1 |flux= Main |étape= Corpus |type= RBID |clé= pubmed:18450568 |texte= Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland. }}
Pour générer des pages wiki
HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Corpus/RBID.i -Sk "pubmed:18450568" \ | HfdSelect -Kh $EXPLOR_AREA/Data/Main/Corpus/biblio.hfd \ | NlmPubMed2Wicri -a PoplarV1
![]() | This area was generated with Dilib version V0.6.37. | ![]() |