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Isoprene synthesis protects transgenic tobacco plants from oxidative stress.
- Source :
-
Plant, Cell & Environment . May2009, Vol. 32 Issue 5, p520-531. 12p. 1 Color Photograph, 1 Chart, 4 Graphs. - Publication Year :
- 2009
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01407791
- Volume :
- 32
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Plant, Cell & Environment
- Publication Type :
- Academic Journal
- Accession number :
- 37345567
- Full Text :
- https://doi.org/10.1111/j.1365-3040.2009.01946.x