Response of isoprene emission and carbon metabolism to drought in white poplar (Populus alba) saplings.
Identifieur interne : 003A82 ( Main/Exploration ); précédent : 003A81; suivant : 003A83Response of isoprene emission and carbon metabolism to drought in white poplar (Populus alba) saplings.
Auteurs : Federico Brilli [Italie] ; Csengele Barta ; Alessio Fortunati ; Manuel Lerdau ; Francesco Loreto ; Mauro CentrittoSource :
- The New phytologist [ 0028-646X ] ; 2007.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Butadiènes, Carbone, Eau, Feuilles de plante, Hémiterpènes, Pentanes, Populus.
- physiologie : Photosynthèse.
- Régulation de l'expression des gènes végétaux.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Butadienes, Carbon, Hemiterpenes, Pentanes, Water.
- metabolism : Plant Leaves, Populus.
- physiology : Photosynthesis.
- Gene Expression Regulation, Plant.
Abstract
The mechanism uncoupling isoprene emission and photosynthesis under drought was investigated in Populus alba saplings. Isoprene emission, incorporation of 13C into the isoprene molecule, isoprene synthase (ISPS) activity, concentration and gene expression, and photosynthesis were measured as a function of the fraction of transpirable soil water (FTSW) and in plants recovering from drought. Photosynthesis sharply declined below FTSW30 (a FTSW of 30%) and its inhibition was not caused by metabolic factors. A decline in isoprene emission was only evident towards the FTSW endpoint. 13C incorporation into isoprene was lower when photosynthesis was constrained by drought. ISPS activity was inhibited by mild drought, while ISPS gene expression and concentration declined in concert with isoprene emission at the FTSW endpoint. Following rewatering, isoprene emission was higher than, and photosynthesis was similar to, prestress values. ISPS activity and concentration, and 13C incorporation into isoprene, also rapidly recovered to prestress values, while ISPS gene expression remained low in rewatered plants. Our experiment revealed a larger contribution of alternative carbon sources to isoprene emission only when photosynthesis was dramatically constrained by drought. Isoprene emission was likely controlled at the posttranscriptional level under severe drought.
DOI: 10.1111/j.1469-8137.2007.02094.x
PubMed: 17587373
Affiliations:
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Isoprene emission, incorporation of 13C into the isoprene molecule, isoprene synthase (ISPS) activity, concentration and gene expression, and photosynthesis were measured as a function of the fraction of transpirable soil water (FTSW) and in plants recovering from drought. Photosynthesis sharply declined below FTSW30 (a FTSW of 30%) and its inhibition was not caused by metabolic factors. A decline in isoprene emission was only evident towards the FTSW endpoint. 13C incorporation into isoprene was lower when photosynthesis was constrained by drought. ISPS activity was inhibited by mild drought, while ISPS gene expression and concentration declined in concert with isoprene emission at the FTSW endpoint. Following rewatering, isoprene emission was higher than, and photosynthesis was similar to, prestress values. ISPS activity and concentration, and 13C incorporation into isoprene, also rapidly recovered to prestress values, while ISPS gene expression remained low in rewatered plants. Our experiment revealed a larger contribution of alternative carbon sources to isoprene emission only when photosynthesis was dramatically constrained by drought. Isoprene emission was likely controlled at the posttranscriptional level under severe drought.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">17587373</PMID><DateCompleted><Year>2007</Year><Month>08</Month><Day>23</Day></DateCompleted><DateRevised><Year>2020</Year><Month>09</Month><Day>30</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0028-646X</ISSN><JournalIssue CitedMedium="Print"><Volume>175</Volume><Issue>2</Issue><PubDate><Year>2007</Year></PubDate></JournalIssue><Title>The New phytologist</Title><ISOAbbreviation>New Phytol</ISOAbbreviation></Journal><ArticleTitle>Response of isoprene emission and carbon metabolism to drought in white poplar (Populus alba) saplings.</ArticleTitle><Pagination><MedlinePgn>244-54</MedlinePgn></Pagination><Abstract><AbstractText>The mechanism uncoupling isoprene emission and photosynthesis under drought was investigated in Populus alba saplings. Isoprene emission, incorporation of 13C into the isoprene molecule, isoprene synthase (ISPS) activity, concentration and gene expression, and photosynthesis were measured as a function of the fraction of transpirable soil water (FTSW) and in plants recovering from drought. Photosynthesis sharply declined below FTSW30 (a FTSW of 30%) and its inhibition was not caused by metabolic factors. A decline in isoprene emission was only evident towards the FTSW endpoint. 13C incorporation into isoprene was lower when photosynthesis was constrained by drought. ISPS activity was inhibited by mild drought, while ISPS gene expression and concentration declined in concert with isoprene emission at the FTSW endpoint. Following rewatering, isoprene emission was higher than, and photosynthesis was similar to, prestress values. ISPS activity and concentration, and 13C incorporation into isoprene, also rapidly recovered to prestress values, while ISPS gene expression remained low in rewatered plants. Our experiment revealed a larger contribution of alternative carbon sources to isoprene emission only when photosynthesis was dramatically constrained by drought. 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Alessio" sort="Fortunati, Alessio" uniqKey="Fortunati A" first="Alessio" last="Fortunati">Alessio Fortunati</name><name sortKey="Lerdau, Manuel" sort="Lerdau, Manuel" uniqKey="Lerdau M" first="Manuel" last="Lerdau">Manuel Lerdau</name><name sortKey="Loreto, Francesco" sort="Loreto, Francesco" uniqKey="Loreto F" first="Francesco" last="Loreto">Francesco Loreto</name></noCountry><country name="Italie"><noRegion><name sortKey="Brilli, Federico" sort="Brilli, Federico" uniqKey="Brilli F" first="Federico" last="Brilli">Federico Brilli</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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