Phytotoxins. II. Characterization of a phytotoxic fraction from alternaria alternata f. sp. lycopersici

✍ Scribed by Albert T. Bottini; John R. Bowen; David G. Gilchrist

• Book ID: 104241730
• Publisher: Elsevier Science
• Year: 1981
• Tongue: French
• Weight: 310 KB
• Volume: 22
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)90535-0

✦ Synopsis

A host-specific phytotoxic fraction obtained from the cell-free culture filtrate of A. aP&~~tia f. sp. eycopmici is shown to consist of two esters of 1,2,3-propanetricarboxylic acid and 1-amino-ll,15-dimethylheptadeca-2,4,5,13,14-pentol1. The sites of esterification are a terminal carboxyl of the acid and Cl3 (major component2a) and C,, (2b) of 1. The stem canker disease of tomato, caused by A. &mnu& f. sp. eycopc,&5ici,iscontrolled in the host by a single genetic locus with two alle1es.l Cell-free culture filtrates of the pathogen yield two ninhydrin-positive fractions,T* andTs, which reproduce the macroscopic disease symptoms only on tomato and do so under quantitative control by the same genetic locus that regulates the disease reaction. TAand Tsar-e separable by isoelectric focusing at pH 4-5,