Interactive effects of water, light and heat stress on photosynthesis in Fremont cottonwood.
Identifieur interne : 002623 ( Main/Exploration ); précédent : 002622; suivant : 002624Interactive effects of water, light and heat stress on photosynthesis in Fremont cottonwood.
Auteurs : Emily S. Tozzi [États-Unis] ; Hsien Ming Easlon ; James H. RichardsSource :
- Plant, cell & environment [ 1365-3040 ] ; 2013.
Descripteurs français
- KwdFr :
- Chlorophylle (métabolisme), Dioxyde de carbone (métabolisme), Déshydratation (MeSH), Eau (physiologie), Feuilles de plante (croissance et développement), Feuilles de plante (effets des radiations), Feuilles de plante (physiologie), Fluorescence (MeSH), Lumière (MeSH), Photosynthèse (physiologie), Plant (croissance et développement), Plant (effets des radiations), Plant (physiologie), Populus (croissance et développement), Populus (effets des radiations), Populus (physiologie), Respiration cellulaire (MeSH), Saisons (MeSH), Température élevée (MeSH).
- MESH :
- croissance et développement : Feuilles de plante, Plant, Populus.
- effets des radiations : Feuilles de plante, Plant, Populus.
- métabolisme : Chlorophylle, Dioxyde de carbone.
- physiologie : Eau, Feuilles de plante, Photosynthèse, Plant, Populus.
- Déshydratation, Fluorescence, Lumière, Respiration cellulaire, Saisons, Température élevée.
English descriptors
- KwdEn :
- Carbon Dioxide (metabolism), Cell Respiration (MeSH), Chlorophyll (metabolism), Dehydration (MeSH), Fluorescence (MeSH), Hot Temperature (MeSH), Light (MeSH), Photosynthesis (physiology), Plant Leaves (growth & development), Plant Leaves (physiology), Plant Leaves (radiation effects), Populus (growth & development), Populus (physiology), Populus (radiation effects), Seasons (MeSH), Seedlings (growth & development), Seedlings (physiology), Seedlings (radiation effects), Water (physiology).
- MESH :
- chemical , metabolism : Carbon Dioxide, Chlorophyll.
- growth & development : Plant Leaves, Populus, Seedlings.
- physiology : Photosynthesis, Plant Leaves, Populus, Seedlings, Water.
- radiation effects : Plant Leaves, Populus, Seedlings.
- Cell Respiration, Dehydration, Fluorescence, Hot Temperature, Light, Seasons.
Abstract
Fremont cottonwood seedlings are vulnerable to water stress from rapid water-table decline during river recession in spring. Water stress is usually cited as the reason for reduced establishment, but interactions of water stress with microclimate extremes are more likely the causes of mortality. We assessed photosynthetic responses of Fremont cottonwood seedlings to water, light and heat stresses, which commonly co-occur in habitats where seedlings establish. Under moderate temperature and light conditions, water stress did not affect photosynthetic function. However, stomatal closure during water stress predisposed Fremont cottonwood leaves to light and heat stress, resulting in greatly reduced photosynthesis beginning at 31 °C versus at 41 °C for well-watered plants. Ontogenetic shifts in leaf orientation from horizontal to vertical, which occur as seedlings mature, reduce heat and light stress, especially during water stress. When compared with naturally occurring microclimate extremes, seedling stress responses suggest that reduced assimilation and photoprotection are common for Fremont cottonwood seedlings on exposed point bars where they establish. These reductions in photosynthesis likely have negative impacts on growth and may predispose young (<90-day-old) seedlings to early mortality during rapid water-table declines. Interactions with heat and light stress are more important in these effects than water stress alone.
DOI: 10.1111/pce.12070
PubMed: 23336343
Affiliations:
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Water stress is usually cited as the reason for reduced establishment, but interactions of water stress with microclimate extremes are more likely the causes of mortality. We assessed photosynthetic responses of Fremont cottonwood seedlings to water, light and heat stresses, which commonly co-occur in habitats where seedlings establish. Under moderate temperature and light conditions, water stress did not affect photosynthetic function. However, stomatal closure during water stress predisposed Fremont cottonwood leaves to light and heat stress, resulting in greatly reduced photosynthesis beginning at 31 °C versus at 41 °C for well-watered plants. Ontogenetic shifts in leaf orientation from horizontal to vertical, which occur as seedlings mature, reduce heat and light stress, especially during water stress. When compared with naturally occurring microclimate extremes, seedling stress responses suggest that reduced assimilation and photoprotection are common for Fremont cottonwood seedlings on exposed point bars where they establish. These reductions in photosynthesis likely have negative impacts on growth and may predispose young (<90-day-old) seedlings to early mortality during rapid water-table declines. Interactions with heat and light stress are more important in these effects than water stress alone.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">23336343</PMID><DateCompleted><Year>2014</Year><Month>01</Month><Day>31</Day></DateCompleted><DateRevised><Year>2015</Year><Month>11</Month><Day>19</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1365-3040</ISSN><JournalIssue CitedMedium="Internet"><Volume>36</Volume><Issue>8</Issue><PubDate><Year>2013</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Plant, cell & environment</Title><ISOAbbreviation>Plant Cell Environ</ISOAbbreviation></Journal><ArticleTitle>Interactive effects of water, light and heat stress on photosynthesis in Fremont cottonwood.</ArticleTitle><Pagination><MedlinePgn>1423-34</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/pce.12070</ELocationID><Abstract><AbstractText>Fremont cottonwood seedlings are vulnerable to water stress from rapid water-table decline during river recession in spring. Water stress is usually cited as the reason for reduced establishment, but interactions of water stress with microclimate extremes are more likely the causes of mortality. We assessed photosynthetic responses of Fremont cottonwood seedlings to water, light and heat stresses, which commonly co-occur in habitats where seedlings establish. Under moderate temperature and light conditions, water stress did not affect photosynthetic function. However, stomatal closure during water stress predisposed Fremont cottonwood leaves to light and heat stress, resulting in greatly reduced photosynthesis beginning at 31 °C versus at 41 °C for well-watered plants. Ontogenetic shifts in leaf orientation from horizontal to vertical, which occur as seedlings mature, reduce heat and light stress, especially during water stress. When compared with naturally occurring microclimate extremes, seedling stress responses suggest that reduced assimilation and photoprotection are common for Fremont cottonwood seedlings on exposed point bars where they establish. These reductions in photosynthesis likely have negative impacts on growth and may predispose young (<90-day-old) seedlings to early mortality during rapid water-table declines. Interactions with heat and light stress are more important in these effects than water stress alone.</AbstractText><CopyrightInformation>© 2013 John Wiley & Sons Ltd.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Tozzi</LastName><ForeName>Emily S</ForeName><Initials>ES</Initials><AffiliationInfo><Affiliation>Department of Land, Air and Water Resources, University of California, Davis, Davis, CA 95616-8627, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Easlon</LastName><ForeName>Hsien Ming</ForeName><Initials>HM</Initials></Author><Author ValidYN="Y"><LastName>Richards</LastName><ForeName>James H</ForeName><Initials>JH</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><ArticleDate DateType="Electronic"><Year>2013</Year><Month>02</Month><Day>25</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Cell Environ</MedlineTA><NlmUniqueID>9309004</NlmUniqueID><ISSNLinking>0140-7791</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>059QF0KO0R</RegistryNumber><NameOfSubstance UI="D014867">Water</NameOfSubstance></Chemical><Chemical><RegistryNumber>1406-65-1</RegistryNumber><NameOfSubstance UI="D002734">Chlorophyll</NameOfSubstance></Chemical><Chemical><RegistryNumber>142M471B3J</RegistryNumber><NameOfSubstance UI="D002245">Carbon Dioxide</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D002245" MajorTopicYN="N">Carbon Dioxide</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D019069" MajorTopicYN="N">Cell Respiration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D002734" MajorTopicYN="N">Chlorophyll</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D003681" MajorTopicYN="N">Dehydration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D005453" MajorTopicYN="N">Fluorescence</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D006358" MajorTopicYN="N">Hot Temperature</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D008027" MajorTopicYN="Y">Light</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="Q000254" MajorTopicYN="N">growth & development</QualifierName><QualifierName UI="Q000502" 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MajorTopicYN="Y">physiology</QualifierName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Populus fremontii</Keyword><Keyword MajorTopicYN="N">chlorophyll fluorescence</Keyword><Keyword MajorTopicYN="N">leaf orientation</Keyword><Keyword MajorTopicYN="N">microclimate</Keyword><Keyword MajorTopicYN="N">photoprotection</Keyword><Keyword MajorTopicYN="N">photorespiration</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2012</Year><Month>10</Month><Day>06</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2012</Year><Month>12</Month><Day>21</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2012</Year><Month>12</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2013</Year><Month>1</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2013</Year><Month>1</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2014</Year><Month>2</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">23336343</ArticleId><ArticleId IdType="doi">10.1111/pce.12070</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><noCountry><name sortKey="Easlon, Hsien Ming" sort="Easlon, Hsien Ming" uniqKey="Easlon H" first="Hsien Ming" last="Easlon">Hsien Ming Easlon</name><name sortKey="Richards, James H" sort="Richards, James H" uniqKey="Richards J" first="James H" last="Richards">James H. Richards</name></noCountry><country name="États-Unis"><region name="Californie"><name sortKey="Tozzi, Emily S" sort="Tozzi, Emily S" uniqKey="Tozzi E" first="Emily S" last="Tozzi">Emily S. Tozzi</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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