Conversion of 3-amino-1, 2,4-triazole into 3-amino-1, 2,4-triazolyl alanine and its incorporation into protein by Escherichia coli

The effect of amitrole (3-amino-1H-1,2-4-triazole) on cytokinin activity and sexual reproduction in the yeast Schizosaccharomyces octosporus

Cytokinin activity in extracts from actively growing cultures of Schizosaccharomyces octosporus was greatly reduced by exposure to amitrole (5 X 10--3M). Amitrole treatment, at the same concentration, stimulated cell enlargment and ascus production in this organism. These data suggest that a relationship may exist between low levels of endogenous cytokinins, cell expansion in preference to cell division, and ascus formation.

Mutagenicity and toxicity of amitrole. III. Microbial tests

Amitrole (3-amino-1,2,4-triazole) inhibits bacterial growth both in Escherichia coli and Salmonella typhimurium at a concentration of 0.5% in minimal medium. Repression of growth already occurs at a concentration of 0.1% of amitrole in this medium. In complete medium the bacteria tolerate concentrations of amitrole as high as 1.7-2.4% before growth ceases. Mutagenicity was tested by differential growth comparisons on E. coli strains W 3110 thy pol A1, defective in DNA polymerase I, and its revertant pol A+. Known mutagens (MMS, NTG, mitomycin C) were used as positive controls. Analogous negative results were also obtained in a revertant test when several trp mutant strains of Salmonella were used.