Heterosis in poplar involves phenotypic stability: cottonwood hybrids outperform their parental species at suboptimal temperatures.
Identifieur interne : 000E51 ( Main/Exploration ); précédent : 000E50; suivant : 000E52Heterosis in poplar involves phenotypic stability: cottonwood hybrids outperform their parental species at suboptimal temperatures.
Auteurs : Karen P. Zanewich [Canada] ; David W. Pearce [Canada] ; Stewart B. Rood [Canada]Source :
- Tree physiology [ 1758-4469 ] ; 2018.
Descripteurs français
- KwdFr :
- MESH :
- croissance et développement : Populus.
- génétique : Populus.
- Alberta, Hybridation génétique, Hérédité, Phénotype, Température, Vigueur hybride.
English descriptors
- KwdEn :
- MESH :
- genetics : Populus.
- growth & development : Populus.
- Alberta, Heredity, Hybrid Vigor, Hybridization, Genetic, Phenotype, Temperature.
Abstract
Heterosis or hybrid vigor is common in hybrid poplars, and to investigate its occurrence and physiological basis we compared narrowleaf cottonwoods, Populus angustifolia James, prairie cottonwoods, Populus deltoides Bartr. ex Marsh, and their native intersectional hybrids, P. × acuminata Rydb., from Alberta, Canada. Clonal replicates from 10 separate trees from each taxon were raised in growth chambers at different temperatures (T). Growth was similarly vigorous across the taxa at 20 and 24 °C, and morphological and physiological traits of the hybrids were generally intermediate between the parental species, or similar to the larger parent, demonstrating additive inheritance or dominance, respectively. Growth declined at 18 and 15 °C particularly in the parental species, and consequently hybrid vigor was displayed for root and especially leaf growth. Stomatal distributions and chlorophyll indices were intermediate in the hybrids and unaffected by T. Foliar nitrogen (N), net assimilation (Asat), stomatal conductance (gs) and transpiration (E) per unit of leaf area were lower in the hybrids, but the hybrids generally had larger leaf areas. Water-use efficiencies (Asat/gs) were similar across the taxa and reduced with warming, while nitrogen-use efficiencies (Asat/N) increased. δ13C was correlated with leaf mass per area, which varied across the taxa. Photosynthesis (Asat) was correlated with chlorophyll content index, N and/or gs in P. deltoides and the hybrids, but not in P. angustifolia, indicating different physiological limitations. We conclude that heterosis in P. × acuminata results from the compound benefits from multiple dominant traits, and superior growth particularly at suboptimal conditions. This indicates phenotypic stability or environmental adaptability, whereby heterozygosity provides metabolic diversity that allows hybrids to thrive across a broader environmental range.
DOI: 10.1093/treephys/tpy019
PubMed: 29509939
Affiliations:
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Pearce</name><affiliation wicri:level="1"><nlm:affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB</wicri:regionArea><wicri:noRegion>Lethbridge AB</wicri:noRegion></affiliation></author><author><name sortKey="Rood, Stewart B" sort="Rood, Stewart B" uniqKey="Rood S" first="Stewart B" last="Rood">Stewart B. 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Zanewich</name><affiliation wicri:level="1"><nlm:affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB</wicri:regionArea><wicri:noRegion>Lethbridge AB</wicri:noRegion></affiliation></author><author><name sortKey="Pearce, David W" sort="Pearce, David W" uniqKey="Pearce D" first="David W" last="Pearce">David W. 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Rood</name><affiliation wicri:level="1"><nlm:affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB</wicri:regionArea><wicri:noRegion>Lethbridge AB</wicri:noRegion></affiliation></author></analytic><series><title level="j">Tree physiology</title><idno type="eISSN">1758-4469</idno><imprint><date when="2018" type="published">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alberta (MeSH)</term><term>Heredity (MeSH)</term><term>Hybrid Vigor (MeSH)</term><term>Hybridization, Genetic (MeSH)</term><term>Phenotype (MeSH)</term><term>Populus (genetics)</term><term>Populus (growth & development)</term><term>Temperature (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Alberta (MeSH)</term><term>Hybridation génétique (MeSH)</term><term>Hérédité (MeSH)</term><term>Phénotype (MeSH)</term><term>Populus (croissance et développement)</term><term>Populus (génétique)</term><term>Température (MeSH)</term><term>Vigueur hybride (MeSH)</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Alberta</term><term>Heredity</term><term>Hybrid Vigor</term><term>Hybridization, Genetic</term><term>Phenotype</term><term>Temperature</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Alberta</term><term>Hybridation génétique</term><term>Hérédité</term><term>Phénotype</term><term>Température</term><term>Vigueur hybride</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Heterosis or hybrid vigor is common in hybrid poplars, and to investigate its occurrence and physiological basis we compared narrowleaf cottonwoods, Populus angustifolia James, prairie cottonwoods, Populus deltoides Bartr. ex Marsh, and their native intersectional hybrids, P. × acuminata Rydb., from Alberta, Canada. Clonal replicates from 10 separate trees from each taxon were raised in growth chambers at different temperatures (T). Growth was similarly vigorous across the taxa at 20 and 24 °C, and morphological and physiological traits of the hybrids were generally intermediate between the parental species, or similar to the larger parent, demonstrating additive inheritance or dominance, respectively. Growth declined at 18 and 15 °C particularly in the parental species, and consequently hybrid vigor was displayed for root and especially leaf growth. Stomatal distributions and chlorophyll indices were intermediate in the hybrids and unaffected by T. Foliar nitrogen (N), net assimilation (Asat), stomatal conductance (gs) and transpiration (E) per unit of leaf area were lower in the hybrids, but the hybrids generally had larger leaf areas. Water-use efficiencies (Asat/gs) were similar across the taxa and reduced with warming, while nitrogen-use efficiencies (Asat/N) increased. δ13C was correlated with leaf mass per area, which varied across the taxa. Photosynthesis (Asat) was correlated with chlorophyll content index, N and/or gs in P. deltoides and the hybrids, but not in P. angustifolia, indicating different physiological limitations. We conclude that heterosis in P. × acuminata results from the compound benefits from multiple dominant traits, and superior growth particularly at suboptimal conditions. This indicates phenotypic stability or environmental adaptability, whereby heterozygosity provides metabolic diversity that allows hybrids to thrive across a broader environmental range.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">29509939</PMID><DateCompleted><Year>2018</Year><Month>11</Month><Day>19</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>19</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1758-4469</ISSN><JournalIssue CitedMedium="Internet"><Volume>38</Volume><Issue>6</Issue><PubDate><Year>2018</Year><Month>06</Month><Day>01</Day></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Heterosis in poplar involves phenotypic stability: cottonwood hybrids outperform their parental species at suboptimal temperatures.</ArticleTitle><Pagination><MedlinePgn>789-800</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1093/treephys/tpy019</ELocationID><Abstract><AbstractText>Heterosis or hybrid vigor is common in hybrid poplars, and to investigate its occurrence and physiological basis we compared narrowleaf cottonwoods, Populus angustifolia James, prairie cottonwoods, Populus deltoides Bartr. ex Marsh, and their native intersectional hybrids, P. × acuminata Rydb., from Alberta, Canada. Clonal replicates from 10 separate trees from each taxon were raised in growth chambers at different temperatures (T). Growth was similarly vigorous across the taxa at 20 and 24 °C, and morphological and physiological traits of the hybrids were generally intermediate between the parental species, or similar to the larger parent, demonstrating additive inheritance or dominance, respectively. Growth declined at 18 and 15 °C particularly in the parental species, and consequently hybrid vigor was displayed for root and especially leaf growth. Stomatal distributions and chlorophyll indices were intermediate in the hybrids and unaffected by T. Foliar nitrogen (N), net assimilation (Asat), stomatal conductance (gs) and transpiration (E) per unit of leaf area were lower in the hybrids, but the hybrids generally had larger leaf areas. Water-use efficiencies (Asat/gs) were similar across the taxa and reduced with warming, while nitrogen-use efficiencies (Asat/N) increased. δ13C was correlated with leaf mass per area, which varied across the taxa. Photosynthesis (Asat) was correlated with chlorophyll content index, N and/or gs in P. deltoides and the hybrids, but not in P. angustifolia, indicating different physiological limitations. We conclude that heterosis in P. × acuminata results from the compound benefits from multiple dominant traits, and superior growth particularly at suboptimal conditions. This indicates phenotypic stability or environmental adaptability, whereby heterozygosity provides metabolic diversity that allows hybrids to thrive across a broader environmental range.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Zanewich</LastName><ForeName>Karen P</ForeName><Initials>KP</Initials><AffiliationInfo><Affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Pearce</LastName><ForeName>David W</ForeName><Initials>DW</Initials><AffiliationInfo><Affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Rood</LastName><ForeName>Stewart B</ForeName><Initials>SB</Initials><AffiliationInfo><Affiliation>Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge AB, Canada T1K 3M4.</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></Article><MedlineJournalInfo><Country>Canada</Country><MedlineTA>Tree Physiol</MedlineTA><NlmUniqueID>100955338</NlmUniqueID><ISSNLinking>0829-318X</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><CommentsCorrectionsList><CommentsCorrections RefType="CommentIn"><RefSource>Tree Physiol. 2018 Jun 1;38(6):785-788</RefSource><PMID Version="1">29788373</PMID></CommentsCorrections></CommentsCorrectionsList><MeshHeadingList><MeshHeading><DescriptorName UI="D000416" MajorTopicYN="N">Alberta</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D040941" MajorTopicYN="N">Heredity</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D006823" MajorTopicYN="Y">Hybrid Vigor</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D006824" MajorTopicYN="Y">Hybridization, Genetic</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010641" MajorTopicYN="Y">Phenotype</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000235" MajorTopicYN="Y">genetics</QualifierName><QualifierName UI="Q000254" MajorTopicYN="N">growth & development</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D013696" MajorTopicYN="Y">Temperature</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2017</Year><Month>07</Month><Day>17</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2018</Year><Month>02</Month><Day>05</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2018</Year><Month>3</Month><Day>7</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2018</Year><Month>11</Month><Day>20</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2018</Year><Month>3</Month><Day>7</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">29509939</ArticleId><ArticleId IdType="pii">4917326</ArticleId><ArticleId IdType="doi">10.1093/treephys/tpy019</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Zanewich, Karen P" sort="Zanewich, Karen P" uniqKey="Zanewich K" first="Karen P" last="Zanewich">Karen P. Zanewich</name></noRegion><name sortKey="Pearce, David W" sort="Pearce, David W" uniqKey="Pearce D" first="David W" last="Pearce">David W. Pearce</name><name sortKey="Rood, Stewart B" sort="Rood, Stewart B" uniqKey="Rood S" first="Stewart B" last="Rood">Stewart B. Rood</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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