Ecosystem implications of genetic variation in water-use of a dominant riparian tree.
Identifieur interne : 004281 ( Main/Exploration ); précédent : 004280; suivant : 004282Ecosystem implications of genetic variation in water-use of a dominant riparian tree.
Auteurs : D G Fischer [États-Unis] ; S C Hart ; T G Whitham ; G D Martinsen ; P. KeimSource :
- Oecologia [ 0029-8549 ] ; 2004.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Isotopes du carbone.
- croissance et développement : Populus.
- physiologie : Populus.
- Arbres, Dynamique des populations, Rivières, Variation génétique, Écosystème, Équilibre hydroélectrolytique.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Carbon Isotopes.
- growth & development : Populus.
- physiology : Populus.
- Ecosystem, Genetic Variation, Population Dynamics, Rivers, Trees, Water-Electrolyte Balance.
Abstract
Genetic variation in dominant species can affect plant and ecosystem functions in natural systems through multiple pathways. Our study focuses on how genetic variation in a dominant riparian tree ( Populus fremontii, P. angustifolia and their natural F(1) and backcross hybrids) affects whole-tree water use, and its potential ecosystem implications. Three major patterns were found. First, in a 12-year-old common garden with trees of known genetic makeup, hybrids had elevated daily integrated leaf-specific transpiration ( E(tl); P=0.013) and average canopy conductance ( G(c); P=0.037), with both E(tl) and G(c) approximately 30% higher in hybrid cross types than parental types. Second, delta(13)C values of leaves from these same trees were significantly more negative in hybrids ( P=0.004), and backcross hybrids had significantly more negative values than all other F(1) hybrid and parental types ( P<0.001). Third, in the wild, a similar pattern was found in leaf delta(13)C values where both hybrid cross types had the lowest values ( P<0.001) and backcross hybrids had lower delta(13)C values than any other tree type ( P<0.001). Our findings have two important implications: (1). the existence of a consistent genetic difference in whole-tree physiology suggests that whole-tree gas and water exchange could be another pathway through which genes could affect ecosystems; and (2). such studies are important because they seek to quantify the genetic variation that exists in basic physiological processes-such knowledge could ultimately place ecosystem studies within a genetic framework.
DOI: 10.1007/s00442-004-1505-7
PubMed: 14767756
Affiliations:
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Dylan.Fischer@nau.edu</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Forestry, Northern Arizona University, Bldg. 82, Box 15018, Flagstaff, AZ 86011-5018</wicri:regionArea><placeName><region type="state">Arizona</region></placeName></affiliation></author><author><name sortKey="Hart, S C" sort="Hart, S C" uniqKey="Hart S" first="S C" last="Hart">S C Hart</name></author><author><name sortKey="Whitham, T G" sort="Whitham, T G" uniqKey="Whitham T" first="T G" last="Whitham">T G Whitham</name></author><author><name sortKey="Martinsen, G D" sort="Martinsen, G D" uniqKey="Martinsen G" first="G D" last="Martinsen">G D Martinsen</name></author><author><name sortKey="Keim, P" sort="Keim, P" uniqKey="Keim P" first="P" last="Keim">P. 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Dylan.Fischer@nau.edu</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Forestry, Northern Arizona University, Bldg. 82, Box 15018, Flagstaff, AZ 86011-5018</wicri:regionArea><placeName><region type="state">Arizona</region></placeName></affiliation></author><author><name sortKey="Hart, S C" sort="Hart, S C" uniqKey="Hart S" first="S C" last="Hart">S C Hart</name></author><author><name sortKey="Whitham, T G" sort="Whitham, T G" uniqKey="Whitham T" first="T G" last="Whitham">T G Whitham</name></author><author><name sortKey="Martinsen, G D" sort="Martinsen, G D" uniqKey="Martinsen G" first="G D" last="Martinsen">G D Martinsen</name></author><author><name sortKey="Keim, P" sort="Keim, P" uniqKey="Keim P" first="P" last="Keim">P. Keim</name></author></analytic><series><title level="j">Oecologia</title><idno type="ISSN">0029-8549</idno><imprint><date when="2004" type="published">2004</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon Isotopes (analysis)</term><term>Ecosystem (MeSH)</term><term>Genetic Variation (MeSH)</term><term>Population Dynamics (MeSH)</term><term>Populus (growth & development)</term><term>Populus (physiology)</term><term>Rivers (MeSH)</term><term>Trees (MeSH)</term><term>Water-Electrolyte Balance (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Arbres (MeSH)</term><term>Dynamique des populations (MeSH)</term><term>Isotopes du carbone (analyse)</term><term>Populus (croissance et développement)</term><term>Populus (physiologie)</term><term>Rivières (MeSH)</term><term>Variation génétique (MeSH)</term><term>Écosystème (MeSH)</term><term>Équilibre hydroélectrolytique (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Carbon Isotopes</term></keywords><keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Isotopes du carbone</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Ecosystem</term><term>Genetic Variation</term><term>Population Dynamics</term><term>Rivers</term><term>Trees</term><term>Water-Electrolyte Balance</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Arbres</term><term>Dynamique des populations</term><term>Rivières</term><term>Variation génétique</term><term>Écosystème</term><term>Équilibre hydroélectrolytique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Genetic variation in dominant species can affect plant and ecosystem functions in natural systems through multiple pathways. Our study focuses on how genetic variation in a dominant riparian tree ( Populus fremontii, P. angustifolia and their natural F(1) and backcross hybrids) affects whole-tree water use, and its potential ecosystem implications. Three major patterns were found. First, in a 12-year-old common garden with trees of known genetic makeup, hybrids had elevated daily integrated leaf-specific transpiration ( E(tl); P=0.013) and average canopy conductance ( G(c); P=0.037), with both E(tl) and G(c) approximately 30% higher in hybrid cross types than parental types. Second, delta(13)C values of leaves from these same trees were significantly more negative in hybrids ( P=0.004), and backcross hybrids had significantly more negative values than all other F(1) hybrid and parental types ( P<0.001). Third, in the wild, a similar pattern was found in leaf delta(13)C values where both hybrid cross types had the lowest values ( P<0.001) and backcross hybrids had lower delta(13)C values than any other tree type ( P<0.001). Our findings have two important implications: (1). the existence of a consistent genetic difference in whole-tree physiology suggests that whole-tree gas and water exchange could be another pathway through which genes could affect ecosystems; and (2). such studies are important because they seek to quantify the genetic variation that exists in basic physiological processes-such knowledge could ultimately place ecosystem studies within a genetic framework.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">14767756</PMID><DateCompleted><Year>2004</Year><Month>08</Month><Day>03</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0029-8549</ISSN><JournalIssue CitedMedium="Print"><Volume>139</Volume><Issue>2</Issue><PubDate><Year>2004</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Oecologia</Title><ISOAbbreviation>Oecologia</ISOAbbreviation></Journal><ArticleTitle>Ecosystem implications of genetic variation in water-use of a dominant riparian tree.</ArticleTitle><Pagination><MedlinePgn>288-97</MedlinePgn></Pagination><Abstract><AbstractText>Genetic variation in dominant species can affect plant and ecosystem functions in natural systems through multiple pathways. Our study focuses on how genetic variation in a dominant riparian tree ( Populus fremontii, P. angustifolia and their natural F(1) and backcross hybrids) affects whole-tree water use, and its potential ecosystem implications. Three major patterns were found. First, in a 12-year-old common garden with trees of known genetic makeup, hybrids had elevated daily integrated leaf-specific transpiration ( E(tl); P=0.013) and average canopy conductance ( G(c); P=0.037), with both E(tl) and G(c) approximately 30% higher in hybrid cross types than parental types. Second, delta(13)C values of leaves from these same trees were significantly more negative in hybrids ( P=0.004), and backcross hybrids had significantly more negative values than all other F(1) hybrid and parental types ( P<0.001). Third, in the wild, a similar pattern was found in leaf delta(13)C values where both hybrid cross types had the lowest values ( P<0.001) and backcross hybrids had lower delta(13)C values than any other tree type ( P<0.001). Our findings have two important implications: (1). the existence of a consistent genetic difference in whole-tree physiology suggests that whole-tree gas and water exchange could be another pathway through which genes could affect ecosystems; and (2). such studies are important because they seek to quantify the genetic variation that exists in basic physiological processes-such knowledge could ultimately place ecosystem studies within a genetic framework.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Fischer</LastName><ForeName>D G</ForeName><Initials>DG</Initials><AffiliationInfo><Affiliation>School of Forestry, Northern Arizona University, Bldg. 82, Box 15018, Flagstaff, AZ 86011-5018, USA. 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Keim</name><name sortKey="Martinsen, G D" sort="Martinsen, G D" uniqKey="Martinsen G" first="G D" last="Martinsen">G D Martinsen</name><name sortKey="Whitham, T G" sort="Whitham, T G" uniqKey="Whitham T" first="T G" last="Whitham">T G Whitham</name></noCountry><country name="États-Unis"><region name="Arizona"><name sortKey="Fischer, D G" sort="Fischer, D G" uniqKey="Fischer D" first="D G" last="Fischer">D G Fischer</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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