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

Steinbrecher, Rainer and Contran, Nicla Aurora and Gugerli, Felix and Schnitzler, Jörg-Peter and Zimmer, Ina and Menard, Terry and Günthardt-Goerg, Madeleine S. (2013) Inter- and intra-specific variability in isoprene production and photosynthesis of Central European oak species. Plant Biology, Vol. 15 (Suppl. 1), p. 148-156. eISSN 1438-8677. Article.

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DOI: 10.1111/j.1438-8677.2012.00688.x

Abstract

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 lmol m -2 s -1. On cloudy days, among the provenances of each species, only net photosynthesis of the Q. robur provenance Hu¨nenberg 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.

Item Type:Article
ID Code:8552
Status:Published
Refereed:Yes
Uncontrolled Keywords:Isoprene emission, isoprene synthase, molecular-genetic assignment, morphological classification, stomatal conductance
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 02 Centri > Centro interdipartimentale Nucleo di ricerca sulla desertificazione
Publisher:Blackwell / Wiley
eISSN:1438-8677
Copyright Holders:© 2012 German Botanical Society and The Royal Botanical Society of the Netherlands
Deposited On:25 Jan 2013 13:42

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