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Toxin profiles of A. radicina grown on carrot slices and rice grains have been established

The toxigenic profile of Alternaria radicina isolated from carrot and other umbelliferous plants has been determined by growing the fungus on rice and carrot discs. Dried and finely ground rice or carrot cultures were extracted with a mixture of acidic acetonitrile, methanol and water. After filtration the culture extracts were appropriately diluted with water, filtered and analysed by reversed phase liquid chromatography with ultraviolet diode array detector. When cultured on rice sixteen out of eighteen isolates produced radicinin and radicinol at levels ranging from 1 to 3921µg/g and from 1 to 44µg/g, respectively, whereas no isolate produced epi-radicinol. Ten out of the eighteen isolates were also cultured on carrot discs, confirming the production of radicinin (19-2840µg/g). Five of these isolates produced epi-radicinol (at levels of 26-223µg/g) and four also produced radicinol (at levels of 3-15µg/g). The results of this investigation confirm that radicinols are important elements in the metabolic profile of A. radicina isolates from carrots and other umbelliferous plants such as celery and parsley. Moreover, they confirm that epi-radicinol is produced by A. radicina on carrot discs, but not on rice. This supports the peculiarity of A. radicina as a carrot pathogen that can easily develop and colonise carrot tissues and produce toxins in vivo.

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CNR Institute of Sciences of Food Production (ISPA)
Via Amendola 122/O
70125 BARI
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