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Behnke, K. ; Ghirardo, A. ; Janz, D.* ; Kanawati, B. ; Esperschütz, J. ; Zimmer, I. ; Schmitt-Kopplin, P. ; Niinemets, U.* ; Polle, A.* ; Schnitzler, J.-P. ; Rosenkranz, M.

Isoprene function in two contrasting poplars under salt and sunflecks.

Tree Physiol. 33, 562-578 (2013)
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In the present study, biogenic volatile organic compound (BVOC) emissions and photosynthetic gas exchange of salt-sensitive (Populus x canescens (Aiton) Sm.) and salt-tolerant (Populus euphratica Oliv.) isoprene-emitting and non-isoprene-emitting poplars were examined under controlled high-salinity and high-temperature and -light episode ('sunfleck') treatments. Combined treatment with salt and sunflecks led to an increased isoprene emission capacity in both poplar species, although the photosynthetic performance of P. × canescens was reduced. Indeed, different allocations of isoprene precursors between the cytosol and the chloroplast in the two species were uncovered by means of (13)CO2 labeling. Populus × canescens leaves, moreover, increased their use of 'alternative' carbon (C) sources in comparison with recently fixed C for isoprene biosynthesis under salinity. Our studies show, however, that isoprene itself does not have a function in poplar survival under salt stress: the non-isoprene-emitting leaves showed only a slightly decreased photosynthetic performance compared with wild type under salt treatment. Lipid composition analysis revealed differences in the double bond index between the isoprene-emitting and non-isoprene-emitting poplars. Four clear metabolomics patterns were recognized, reflecting systemic changes in flavonoids, sterols and C fixation metabolites due to the lack/presence of isoprene and the absence/presence of salt stress. The studies were complemented by long-term temperature stress experiments, which revealed the thermotolerance role of isoprene as the non-isoprene-emitting leaves collapsed under high temperature, releasing a burst of BVOCs. Engineered plants with a low isoprene emission potential might therefore not be capable of resisting high-temperature episodes.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter 13C labeling; Populus euphratica; Populus × canescens; isoprene; lipids; metabolomics; salt; thermotolerance; Organic-compound Emissions ; Oak Quercus-robur ; Water-stress ; Increases Thermotolerance ; Volatile Isoprenoids ; Electrolyte Leakage ; Synthase Activity ; Energy Crops ; Fatty-acids ; Leaves
Sprache englisch
Veröffentlichungsjahr 2013
HGF-Berichtsjahr 2013
ISSN (print) / ISBN 0829-318X
e-ISSN 1758-4469
Zeitschrift Tree Physiology
Quellenangaben Band: 33, Heft: 6, Seiten: 562-578 Artikelnummer: , Supplement: ,
Verlag Oxford University Press
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit Environmental Simulation (EUS)
Research Unit BioGeoChemistry and Analytics (BGC)
Institute of Soil Ecology (IBOE)
POF Topic(s) 30202 - Environmental Health
20402 - Sustainable Plant Production
Forschungsfeld(er) Environmental Sciences
PSP-Element(e) G-504991-001
G-504800-001
G-504400-001
PubMed ID 23532135
DOI 10.1093/treephys/tpt018
WOS ID WOS:000321463800002
Scopus ID 84880289559
Erfassungsdatum 2013-07-30
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