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Journal of Experimental Botany, Vol. 53, No. 367, pp. 207-214, February 1, 2002
© 2002 Oxford University Press

Original Papers

Infection of leaves of Arabidopsis thaliana by Botrytis cinerea: changes in ascorbic acid, free radicals and lipid peroxidation products

I. Muckenschnabel, B.A. Goodman1, B. Williamson, G.D. Lyon and N. Deighton

Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK

Infection of leaves of Arabidopsis thaliana with conidial suspensions of the necrotrophic pathogen Botrytis cinerea resulted in a large decrease in the level of ascorbic acid and increases in intensity of a single-peak free radical and Fe(III) (g=4.27) signals in electron paramagnetic resonance (EPR) spectra. These changes were not confined to the spreading lesions or associated areas of chlorosis, but extended to other apparently healthy tissues in the infected leaves. They are, therefore, consistent with the existence of high levels of oxidative stress being generated as a result of the infection process. The expected accompanying increases in levels of the aldehydic products of lipid peroxidation, malondialdehyde (MDA) and 4-hydroxy-2-nonenal (4-HNE), were not observed, and in the case of MDA the levels in tissue from infected plants were appreciably lower than in the healthy controls. These last findings are surprising and demonstrate a difference in the response of A. thaliana to infection with B. cinerea compared with tissues from other plant families studied previously.

Key words: Arabidopsis thaliana, ascorbate, lipid peroxidation, necrotroph, oxidative stress.


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