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Are free radical generation and phytoalexin biosynthesis coupled?

Published online by Cambridge University Press:  05 December 2011

N. Deighton ,
G. D. Lyon ,
D. Johnston ,
S. M. Glidewell  and
B. A. Goodman
N. Deighton
Affiliation:
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
G. D. Lyon
Affiliation:
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
D. Johnston
Affiliation:
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
S. M. Glidewell
Affiliation:
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
B. A. Goodman
Affiliation:
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
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Extract

The induction of plant defence mechanisms has been extensively studied in recent years and there appear to be three interdependent roles for free radicals in the host response (Sutherland 1991) viz; oxidation of specific host components, which may include lipid peroxidation (Rogers et al. 1988) and cell wall lignification (Bolwell et al. 1985), direct injury to the pathogen, and signal transduction upon infection. A potential messenger role has been proposed for the short-lived hydroxyl radical, HO˙ (Epperlein et al. 1986) and the superoxide radical anion, O2−˙ (Doke 1983; Doke et al. 1991).

The present study has utilised EPR spectroscopy and spin trapping with α-(4-pyridyl l-oxide)-N-tert-butylnitrone (POBN) to investigate the free radical chemistry of soybean cotyledons during incompatible infection, abiotic elicitation and wounding.

Type
Short Communications
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 102: Oxygen and Environmental Stress in Plants , 1994 , pp. 253 - 255
Copyright
Copyright © Royal Society of Edinburgh 1994

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References

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