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Jewel sweetpotato storage roots previously treated with ultraviolet (UV–C) light and then stored for 30 days before artificial inoculation with  Fusarium solani  showed increased resistance to Fusarium root rot; as indicated by reduced lesion size, the rate of decay development of rotted tissues. There was a hormetic relationship between the incidence of Fusarium root rot and UV–C doses. The optimum dose of UV which reduced Fusarium root rot was 3.6× 10 4  ergs/mm 2 . Exposure of sweetpotato to UV–C doses promoted phenylalanine ammonia–lyase (PAL) 4  production with the maximum PAL activity occurring at 3.6×10 4  ergs/mm 2 . Crude extracts from UV–C treated sweetpotatoes reduced germination, germ tube elongation and growth of  F. solani  when compared to untreated extracts.

INDUCED RESISTANCE RESPONSE OF SWEETPOTATO TO FUSARIUM ROOT ROT BY UV-HORMESIS