Isolation and synthesis of a host-selective toxin produced by Alternaria alternata

Article abstract of DOI:10.1016/S0031-9422(96)00789-3

Two phytotoxins are isolated from culture filtrates of an Alternaria alternata pathogenic to sunflower. One was identified by chemical and physicochemical techniques as the tetrapeptide Ser-Val-Gly-Glu. This peptide, for which we suggested the name AS-I toxin, was further characterised by synthesis and by its phytotoxic effect on sunflower and other plants.