Biochemical alteration in bradhyrhizobium sp USDA 3187 induced by the fungicide Mancozeb

ADRIANA FABRA; JORGE ANGELINI,; ANA DONOLO; MARCELA PERMIGIANI; STELLA CASTRO

Antonie Van Leeuwenhoek

Año: 1998 vol. 73 p. 223 - 228

We have previously shown that fungicide Mancozch causcs a 50% decrease in Bradyrhizobium sp USDA 3 187 growth rate and affects the bacteria-root symbiotic interaction. In order to elucidate the fungicide toxicity mechanism we determined the effects of Mancozeb on cell chemical composition, glutathione (GSH) content (molecule involved in the detoxification process), glutathione S-transferase (GST) activity and on polyamjne, exopolysaccharides, capsular polysaccharides and Iipopolysaccharides. Mancozeb produced biochemical alterations in membrane composition, polysaccharides and polyamines. In spite of the increment of GSH content and GST activity, they are not enough to prevent the growth diminution.