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A new phytotoxin, epi-radicinol, was isolated from A. radicina and identified by means of GC-MS, LC-Ms, 1H-NMR, and 13C-NMR

Alternaria radicina is a seedborne fungal pathogen responsible for black rot disease of carrots and is a known producer of the phytotoxin radicin. Although the pathogenicity of A. radicina against carrot has been previously described, no data are available on the possible involvement of radicinin as pathogenicity or virulence factors of A. radicina versus this vegetable. Alternaria radicina cultured on carrot slices produced radicinin together with another compound having an UV spectrum similar to that of radicinol. The phytotoxin epi-radicinol, a diastereomer of radicinol, was isolated from large cultures of Alternaria radicina cultured on carrot slices and identified by GC/MS, LC/MS, 1H NMR and 13C NMR. Radicinin and epi-radicinol showed a phytotoxic effect on carrot seedlings producing root growth inhibition. The natural occurrence of epi-radicinol and, to a lesser extent, of radicinol and radicinin has been demonstrated in carrots affected by A. radicina black rot. These results together with the finding of higher levels of these phytotoxins in carrot cultivars more susceptible to A. radicina suggest that radicinin and radicinols could play a role in the pathogenicity of A. radicina against carrot.

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