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

in HortScience
View More View Less
  • 1 1George Washington Carver Agricultural Experiment Station Tuskegee University, Tuskegee Institute, AL. 36088
  • | 2 2USDA/ARS Appalachian Fruit Research Station, Kearneyville, WV.
  • | 3 3ARO, Volcani Center P.O. Box 6, Bet Dagan, Israel, 50250

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× 104 ergs/mm2. Exposure of sweetpotato to UV–C doses promoted phenylalanine ammonia–lyase (PAL)4 production with the maximum PAL activity occurring at 3.6×104 ergs/mm2. Crude extracts from UV–C treated sweetpotatoes reduced germination, germ tube elongation and growth of F. solani when compared to untreated extracts.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 41 7 2
PDF Downloads 81 37 2