Populus tremuloides photosynthesis and crown architecture in response to elevated CO2 and soil N availability.
Identifieur interne : 004977 ( Main/Exploration ); précédent : 004976; suivant : 004978Populus tremuloides photosynthesis and crown architecture in response to elevated CO2 and soil N availability.
Auteurs : M E Kubiske [États-Unis] ; Kurt S. Pregitzer [États-Unis] ; Carl J. Mikan [États-Unis] ; Donald R. Zak [États-Unis] ; Jennifer L. Maziasz [États-Unis] ; A. Teeri [États-Unis]Source :
- Oecologia [ 1432-1939 ] ; 1997.
Abstract
We tested the hypothesis that elevated CO2 would stimulate proportionally higher photosynthesis in the lower crown of Populus trees due to less N retranslocation, compared to tree crowns in ambient CO2. Such a response could increase belowground C allocation, particularly in trees with an indeterminate growth pattern such as Populus tremuloides. Rooted cuttings of P. tremuloides were grown in ambient and twice ambient (elevated) CO2 and in low and high soil N availability (89 ± 7 and 333 ± 16 ng N g-1 day-1 net mineralization, respectively) for 95 days using open-top chambers and open-bottom root boxes. Elevated CO2 resulted in significantly higher maximum leaf photosynthesis (A max) at both soil N levels. A max was higher at high N than at low N soil in elevated, but not ambient CO2. Photosynthetic N use efficiency was higher at elevated than ambient CO2 in both soil types. Elevated CO2 resulted in proportionally higher whole leaf A in the lower three-quarters to one-half of the crown for both soil types. At elevated CO2 and high N availability, lower crown leaves had significantly lower ratios of carboxylation capacity to electron transport capacity (V cmax/J max) than at ambient CO2 and/or low N availability. From the top to the bottom of the tree crowns, V cmax/J max increased in ambient CO2, but it decreased in elevated CO2 indicating a greater relative investment of N into light harvesting for the lower crown. Only the mid-crown leaves at both N levels exhibited photosynthetic down regulation to elevated CO2. Stem biomass segments (consisting of three nodes and internodes) were compared to the total A leaf for each segment. This analysis indicated that increased A leaf at elevated CO2 did not result in a proportional increase in local stem segment mass, suggesting that C allocation to sinks other than the local stem segment increased disproportionally. Since C allocated to roots in young Populus trees is primarily assimilated by leaves in the lower crown, the results of this study suggest a mechanism by which C allocation to roots in young trees may increase in elevated CO2.
DOI: 10.1007/PL00008813
PubMed: 28307221
Affiliations:
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Pregitzer</name><affiliation wicri:level="1"><nlm:affiliation>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , , US.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , </wicri:regionArea><wicri:noRegion></wicri:noRegion></affiliation></author><author><name sortKey="Mikan, Carl J" sort="Mikan, Carl J" uniqKey="Mikan C" first="Carl J" last="Mikan">Carl J. Mikan</name><affiliation wicri:level="1"><nlm:affiliation>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , </wicri:regionArea><wicri:noRegion></wicri:noRegion></affiliation></author><author><name sortKey="Zak, Donald R" sort="Zak, Donald R" uniqKey="Zak D" first="Donald R" last="Zak">Donald R. Zak</name><affiliation wicri:level="1"><nlm:affiliation>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , </wicri:regionArea><wicri:noRegion></wicri:noRegion></affiliation></author><author><name sortKey="Maziasz, Jennifer L" sort="Maziasz, Jennifer L" uniqKey="Maziasz J" first="Jennifer L" last="Maziasz">Jennifer L. Maziasz</name><affiliation wicri:level="1"><nlm:affiliation>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , , US.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , </wicri:regionArea><wicri:noRegion></wicri:noRegion></affiliation></author><author><name sortKey="Teeri, A" sort="Teeri, A" uniqKey="Teeri A" first="A" last="Teeri">A. Teeri</name><affiliation wicri:level="1"><nlm:affiliation>The University of Michigan Biological Station, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>The University of Michigan Biological Station, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , </wicri:regionArea><wicri:noRegion></wicri:noRegion></affiliation></author></analytic><series><title level="j">Oecologia</title><idno type="eISSN">1432-1939</idno><imprint><date when="1997" type="published">1997</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We tested the hypothesis that elevated CO<sub>2</sub> would stimulate proportionally higher photosynthesis in the lower crown of Populus trees due to less N retranslocation, compared to tree crowns in ambient CO<sub>2</sub>. Such a response could increase belowground C allocation, particularly in trees with an indeterminate growth pattern such as Populus tremuloides. Rooted cuttings of P. tremuloides were grown in ambient and twice ambient (elevated) CO<sub>2</sub> and in low and high soil N availability (89 ± 7 and 333 ± 16 ng N g<sup>-1</sup> day<sup>-1</sup> net mineralization, respectively) for 95 days using open-top chambers and open-bottom root boxes. Elevated CO<sub>2</sub> resulted in significantly higher maximum leaf photosynthesis (A <sub>max</sub>) at both soil N levels. A <sub>max</sub> was higher at high N than at low N soil in elevated, but not ambient CO<sub>2</sub>. Photosynthetic N use efficiency was higher at elevated than ambient CO<sub>2</sub> in both soil types. Elevated CO<sub>2</sub> resulted in proportionally higher whole leaf A in the lower three-quarters to one-half of the crown for both soil types. At elevated CO<sub>2</sub> and high N availability, lower crown leaves had significantly lower ratios of carboxylation capacity to electron transport capacity (V <sub>cmax</sub>/J <sub>max</sub>) than at ambient CO<sub>2</sub> and/or low N availability. From the top to the bottom of the tree crowns, V <sub>cmax</sub>/J <sub>max</sub> increased in ambient CO<sub>2</sub>, but it decreased in elevated CO<sub>2</sub> indicating a greater relative investment of N into light harvesting for the lower crown. Only the mid-crown leaves at both N levels exhibited photosynthetic down regulation to elevated CO<sub>2</sub>. Stem biomass segments (consisting of three nodes and internodes) were compared to the total A <sub>leaf</sub> for each segment. This analysis indicated that increased A <sub>leaf</sub> at elevated CO<sub>2</sub> did not result in a proportional increase in local stem segment mass, suggesting that C allocation to sinks other than the local stem segment increased disproportionally. Since C allocated to roots in young Populus trees is primarily assimilated by leaves in the lower crown, the results of this study suggest a mechanism by which C allocation to roots in young trees may increase in elevated CO<sub>2</sub>.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">28307221</PMID><DateRevised><Year>2019</Year><Month>11</Month><Day>20</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1432-1939</ISSN><JournalIssue CitedMedium="Internet"><Volume>110</Volume><Issue>3</Issue><PubDate><Year>1997</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Oecologia</Title><ISOAbbreviation>Oecologia</ISOAbbreviation></Journal><ArticleTitle>Populus tremuloides photosynthesis and crown architecture in response to elevated CO<sub>2</sub> and soil N availability.</ArticleTitle><Pagination><MedlinePgn>328-336</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/PL00008813</ELocationID><Abstract><AbstractText>We tested the hypothesis that elevated CO<sub>2</sub> would stimulate proportionally higher photosynthesis in the lower crown of Populus trees due to less N retranslocation, compared to tree crowns in ambient CO<sub>2</sub>. Such a response could increase belowground C allocation, particularly in trees with an indeterminate growth pattern such as Populus tremuloides. Rooted cuttings of P. tremuloides were grown in ambient and twice ambient (elevated) CO<sub>2</sub> and in low and high soil N availability (89 ± 7 and 333 ± 16 ng N g<sup>-1</sup> day<sup>-1</sup> net mineralization, respectively) for 95 days using open-top chambers and open-bottom root boxes. Elevated CO<sub>2</sub> resulted in significantly higher maximum leaf photosynthesis (A <sub>max</sub>) at both soil N levels. A <sub>max</sub> was higher at high N than at low N soil in elevated, but not ambient CO<sub>2</sub>. Photosynthetic N use efficiency was higher at elevated than ambient CO<sub>2</sub> in both soil types. Elevated CO<sub>2</sub> resulted in proportionally higher whole leaf A in the lower three-quarters to one-half of the crown for both soil types. At elevated CO<sub>2</sub> and high N availability, lower crown leaves had significantly lower ratios of carboxylation capacity to electron transport capacity (V <sub>cmax</sub>/J <sub>max</sub>) than at ambient CO<sub>2</sub> and/or low N availability. From the top to the bottom of the tree crowns, V <sub>cmax</sub>/J <sub>max</sub> increased in ambient CO<sub>2</sub>, but it decreased in elevated CO<sub>2</sub> indicating a greater relative investment of N into light harvesting for the lower crown. Only the mid-crown leaves at both N levels exhibited photosynthetic down regulation to elevated CO<sub>2</sub>. Stem biomass segments (consisting of three nodes and internodes) were compared to the total A <sub>leaf</sub> for each segment. This analysis indicated that increased A <sub>leaf</sub> at elevated CO<sub>2</sub> did not result in a proportional increase in local stem segment mass, suggesting that C allocation to sinks other than the local stem segment increased disproportionally. Since C allocated to roots in young Populus trees is primarily assimilated by leaves in the lower crown, the results of this study suggest a mechanism by which C allocation to roots in young trees may increase in elevated CO<sub>2</sub>.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Kubiske</LastName><ForeName>M E</ForeName><Initials>ME</Initials><AffiliationInfo><Affiliation>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , , US.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Pregitzer</LastName><ForeName>Kurt S</ForeName><Initials>KS</Initials><AffiliationInfo><Affiliation>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , , US.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Mikan</LastName><ForeName>Carl J</ForeName><Initials>CJ</Initials><AffiliationInfo><Affiliation>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zak</LastName><ForeName>Donald R</ForeName><Initials>DR</Initials><AffiliationInfo><Affiliation>School of Natural Resources and Environment, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Maziasz</LastName><ForeName>Jennifer L</ForeName><Initials>JL</Initials><AffiliationInfo><Affiliation>School of Forestry and Wood Products, Michigan Technological University, Houghton, MI 49931, USA, , , , , , US.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Teeri</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>The University of Michigan Biological Station, The University of Michigan, Ann Arbor, MI 48109, USA, , , , , , US.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Oecologia</MedlineTA><NlmUniqueID>0150372</NlmUniqueID><ISSNLinking>0029-8549</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Key words Carbon allocation </Keyword><Keyword MajorTopicYN="N"> Nitrogen </Keyword><Keyword MajorTopicYN="N"> Elevated CO2 </Keyword><Keyword MajorTopicYN="N"> Photosynthesis </Keyword><Keyword MajorTopicYN="N"> Populus tremuloides</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2017</Year><Month>3</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>1997</Year><Month>4</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1997</Year><Month>4</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">28307221</ArticleId><ArticleId IdType="doi">10.1007/PL00008813</ArticleId><ArticleId IdType="pii">10.1007/PL00008813</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Kubiske, M E" sort="Kubiske, M E" uniqKey="Kubiske M" first="M E" last="Kubiske">M E Kubiske</name></noRegion><name sortKey="Maziasz, Jennifer L" sort="Maziasz, Jennifer L" uniqKey="Maziasz J" first="Jennifer L" last="Maziasz">Jennifer L. Maziasz</name><name sortKey="Mikan, Carl J" sort="Mikan, Carl J" uniqKey="Mikan C" first="Carl J" last="Mikan">Carl J. Mikan</name><name sortKey="Pregitzer, Kurt S" sort="Pregitzer, Kurt S" uniqKey="Pregitzer K" first="Kurt S" last="Pregitzer">Kurt S. Pregitzer</name><name sortKey="Teeri, A" sort="Teeri, A" uniqKey="Teeri A" first="A" last="Teeri">A. Teeri</name><name sortKey="Zak, Donald R" sort="Zak, Donald R" uniqKey="Zak D" first="Donald R" last="Zak">Donald R. Zak</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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