Occurrence of Tomato stem canker in Korea and phytotoxin production by the pathogen
1989
Choi, T.J. | Chung, H.S. | Lee, Y.W. (Seoul National Univ., Suwon (Korea R.). Coll. of Agriculture)
Tomato stem canker caused by Alternaria alternata (Fr.) keissler was found from several regions in Korea during the growing seasons of both 1985 and 1986 years. Conidia of the fungus were formed in long chains and measured 13-66x7-17micro m with 1-7 transversal septa and 1-5 longitudinal septa on host plant. Conidia formed on culture media were smaller than those on host tissue. The toxin produced by the pathogen in liquid culture was detected by detached leaf bioassay. The correlation between virulence and toxin productivity of the fungus was discussed. Eight of potential host plants including pepper and 11 tomato cultivars were treated with culture filtrate or partially purified toxin. Toxic symptoms were found on only tomato cultivars susceptible to stem cankers. Partially purified toxin showed a single band on TLC plates and was speculated to be a peptide
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