Infection of plants by root-knot nematodes is often accompanied by physiological changes characteristic of ageing. Ultra-low tissue luminescence of infected plants indicated oxidation of cell-membrane lipids. Cells with membranes subjected to oxidation lose some of their capacity for water retention. Treating tomato and radish with lidocaine hydrochloride, an inhibitor of lipid oxidation, retarded above-ground symptoms of root-knot nematode infection and of ageing.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2617868PMC

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