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Isoprene synthesis protects transgenic tobacco plants from oxidative stress

Vickers, CE and Possell, M and Cojocariu, CI and Velikova, VB and Laothawornkitkul, J and Ryan, A and Mullineaux, PM and Nicholas Hewitt, C (2009) 'Isoprene synthesis protects transgenic tobacco plants from oxidative stress.' Plant, Cell and Environment, 32 (5). 520 - 531. ISSN 0140-7791

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Abstract

Isoprene emission represents a significant loss of carbon to those plant species that synthesize this highly volatile and reactive compound. As a tool for studying the role of isoprene in plant physiology and biochemistry, we developed transgenic tobacco plants capable of emitting isoprene in a similar manner to and at rates comparable to a naturally emitting species. Thermotolerance of photosynthesis against transient high-temperature episodes could only be observed in lines emitting high levels of isoprene; the effect was very mild and could only be identified over repetitive stress events. However, isoprene-emitting plants were highly resistant to ozone-induced oxidative damage compared with their non-emitting azygous controls. In ozone-treated plants, accumulation of toxic reactive oxygen species (ROS) was inhibited, and antioxidant levels were higher. Isoprene-emitting plants showed remarkably decreased foliar damage and higher rates of photosynthesis compared to non-emitting plants immediately following oxidative stress events. An inhibition of hydrogen peroxide accumulation in isoprene-emitting plants may stall the programmed cell death response which would otherwise lead to foliar necrosis. These results demonstrate that endogenously produced isoprene provides protection from oxidative damage. © 2009 Blackwell Publishing Ltd.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 06 Oct 2011 13:57
Last Modified: 19 Aug 2019 17:15
URI: http://repository.essex.ac.uk/id/eprint/885

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