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Steinbrecher, R.* ; Contran, N.* ; Gugerli, F.* ; Schnitzler, J.-P. ; Zimmer, I. ; Menard, T.* ; Günthardt-Goerg, M.S.*

Inter- and intra-specific variability in isoprene production and photosynthesis of Central European oak species.

Plant Biol. 15, 148-156 (2013)

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Open Access Green as soon as Postprint is submitted to ZB.

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European deciduous oaks are closely related and are known for their strong emission of volatile isoprenoids. They are chemo-taxonomically diverse, but hybridise frequently. Four-year-old oak seedlings growing together in a model ecosystem facility under near-natural conditions were studied. The leaves were morphologically classified in the three oak species Quercus robur, Q. pubescens and Q. petraea (with four provenances each) and further investigated by a molecular-genetic approach. Q. robur was morphologically and genetically clearly different from Q. pubescens and Q. petraea, whereas Q. pubescens and Q. petraea individuals used in this study were morphologically and genetically more similar. There was a minor impact of among and within species variability on isoprene synthesis, isoprene emission and photosynthesis. Isoprene emission rates normalised to 25 °C leaf temperature ranged from 5.78 to 10.66 nmol m⁻² s⁻¹, whereas photosynthesis ranged from 12.8 to 17.6 μmol m⁻² s⁻¹. On cloudy days, among the provenances of each species, only net photosynthesis of the Q. robur provenance Hünenberg was reduced and isoprene synthase activity of the Q. pubescens provenance Promotogno increased. On sunny days, photosynthesis did not differ among the provenances. Over all provenances, gas exchange on cloudy days did not differ significantly from sunny days. In the combined data of cloudy and sunny days, no differences between the studied provenances and oak species were detected in isoprene emission and photosynthesis. Thus, isoprene emission and photosynthesis rates were remarkably stable among oak species and provenances. The results indicate that taxonomic differences in the studied oak species are not reflected in isoprene emission and photosynthesis, probably because of the high plasticity of gene expression resulting in high phenotypic flexibility.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Isoprene emission; isoprene synthase; molecular-genetic assignment; morphological classification; stomatal conductance; QUERCUS-PUBESCENS WILLD.; MEVALONATE-INDEPENDENT PATHWAY; VOLATILE ORGANIC-COMPOUNDS; PETRAEA MATT. LIEBL.; SYNTHASE ACTIVITY; ROBUR L.; DIMETHYLALLYL DIPHOSPHATE; LEAF MORPHOLOGY; EMISSION RATES; LEAVES

ISSN (print) / ISBN 1435-8603

e-ISSN 1438-8677

Journal Plant Biology

Quellenangaben Volume: 15, Issue: S1, Pages: 148-156

Publisher Wiley

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Environmental Simulation (BIOP-EUS)