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Published on April 27, 2007; 10.1104/pp.107.098509

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Received February 23, 2007
Accepted April 11, 2007

Arabidopsis, a Model to Study Biological Functions of Isoprene Emission?

Maaria Loivamäki , Frank Gilmer , Robert J. Fischbach , Christoph Sörgel , Anette Bachl , Achim Walter , and Jörg-Peter Schnitzler *

Research Centre Karlsruhe, Institute for Meteorology and Climate Research (IMK-IFU), Kreuzeckbahnstr. 19, 82467 Garmisch-Partenkirchen, Germany; Research Centre Jülich, Institute of Chemistry and Dynamics of the Geosphere (ICG-3): Phytosphere, Leo-Brandt-Str., 52428 Jülich, Germany

* Corresponding author; email: joerg-peter.schnitzler{at}imk.fzk.de.

The volatile hemiterpene isoprene is emitted from plants and can affect atmospheric chemistry. Although recent studies indicate that isoprene can enhance thermotolerance or quench oxidative stress, the underlying physiological mechanisms are largely unknown.

In the present work Arabidopsis thaliana, a natural non-emitter of isoprene and the model plant for functional plant analyses has been constitutively transformed with the isoprene synthase gene (PcISPS) from Grey poplar (Populus x canescens). Over-expression of poplar ISPS in Arabidopsis resulted in isoprene-emitting rosettes that showed transiently enhanced growth rates compared to wild type under moderate thermal stress. The findings that highest growth rates, higher DMADP levels and enzyme activity were detected in young plants during their vegetative growth phase indicate that enhanced growth of transgenic plants under moderate thermal stress is due to introduced PcISPS. Dynamic gas exchange studies applying transient cycles of heat stress to the wild type demonstrate clearly that the prime physiological role of isoprene formation in Arabidopsis is not to protect net assimilation from damage against thermal stress, but may instead be to retain the growth potential or coordinated vegetative development of the plant. Hence, the present study demonstrates the enormous potential but also the pitfalls of transgenic Arabidopsis - or other non-natural isoprenoid emitters - in studying isoprene biosynthesis and its biological function(s).




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T. D. Sharkey, A. E. Wiberley, and A. R. Donohue
Isoprene Emission from Plants: Why and How
Ann. Bot., January 1, 2008; 101(1): 5 - 18.
[Abstract] [Full Text] [PDF]


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