http://www.cnr.it/ontology/cnr/individuo/prodotto/ID10769
Isoprene emission is not temperature-dependent during and after severe drought-stress: a physiological and biochemical analysis (Articolo in rivista)
- Type
- Label
- Isoprene emission is not temperature-dependent during and after severe drought-stress: a physiological and biochemical analysis (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1111/j.1365-313X.2008.03538.x (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Fortunati A. (1); C. Barta (1); F. Brilli (1); M. Centritto (1); I. Zimmer (2); J-P. Schnitzler (2); F. Loreto (1) (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1) Istituto di Biologia Agroambientale e Forestale (IBAF) - Consiglio Nazionale delle Ricerche (CNR), Via Salaria Km. 29,300, 00015, Monterotondo, Roma, Italy, and
2) Research Centre Karlsruhe, Institute for Meteorology and Climate Research (IMK-IFU), Kreuzeckbahnstr. 19, 82467 Garmisch-Partenkirchen, Germany (literal)
- Titolo
- Isoprene emission is not temperature-dependent during and after severe drought-stress: a physiological and biochemical analysis (literal)
- Abstract
- Black poplar (Populus nigra L.) plants grown at 25 and 35?C were subjected to drought stress to assess the
combined impact of two consequences of global climate change - rising temperature and drought - on
isoprene biosynthesis and emission. At both temperatures, photosynthesis was inhibited by moderate
drought, but isoprene emission only decreased when drought was prolonged. The mRNA transcript level,
protein concentration and activity of isoprene synthase (ISPS) changed in concert with isoprene emission
during drought stress. However, ISPS activity decreased before isoprene emission during drought development,
indicating a tighter control of the emission at a transcriptional or post-transcriptional level under
moderate drought stress, and at both temperatures. A residual isoprene emission was measured when
photosynthesis was totally inhibited after 35 days of drought. This photosynthesis-independent emission of
isoprene was probably dependent on a cytosolic carbon supply as all the properties of ISPS were drastically
inhibited. Isoprene emission was associated with dark respiration during the entire drought stress period, and
at both temperatures, indicating that the two processes are sustained by, but do not compete for, the same
carbon source. Isoprene emission was directly related to phosphoenolpyruvate carboxylase activity in plants
grown at 25?C and inversely related in plants grown at 35?C, suggesting a strong temperature control on the
regulation of the pyruvate flowing from the cytosol to the plastidic isoprenoid biosynthetic pathway under
drought stress and recovery. In re-watered plants, the temperature control on isoprene emission was
suppressed, despite complete recovery of photosynthesis and ISPS activity similar to levels in plants subjected
to mild drought stress. Our results reveal the overriding effects of drought on isoprene emission, possibly
affecting protein level or substrate supply. These effects may largely offset the predicted impact of rising
temperatures on the emission of isoprene in terrestrial ecosystems. (literal)
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