Alkaline hydrolysis of cell wall material of tomato hairy roots yielded ferulic acid as the major phenolic compound. Other phenolics were 4-hydroxybenzoic acid, vanillic acid, 4-hydroxybenzaldehyde, vanillin and 4-coumaric acid. The content of phenolics was much higher at the early stage of hairy root growth. The ferulic acid content decreased up to 30 days and then sharply increased to 360 microg/g at 60 days of growth. Elicitation of hairy root cultures with Fusarium mat extract (FME) increased ferulic acid content 4-fold after 24 h. As the pathogen-derived elicitors have specific receptors in plants, FME may thus be used for inducing resistance against Fusarium oxysporum f. sp. lycopersici.
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