Xanthan gum production by altered pathogenicity variants of Xanthomonas campestris
Por:
Ramírez M.E., Fucikovsky L., García-Jiménez F., Quintero R., Galindo E.
Publicada:
1 ene 1988
Resumen:
Several morphologically different isolates of Xanthomonas campestris pv. campestris were obtained by treatment with N-methyl-N?-nitro-N-nitrosoguanidine. These variants were used to infect Brassica plants where several degrees of virulence were found. The strains were cultured in order to produce polysaccharide, which was recovered by precipitation and subjected to physical and chemical characterization. A relationship was noted between virulence and parameters such as the final viscosity of the culture, the viscosifying capacity of the polymer and the amount of acetyl substituents in the gum. Infrared spectral analysis revealed that intramolecular interaction of gum constituents could play a significant role in virulence. It is suggested that the degree of virulence could be used as a criterion for selecting and isolating producers of high quality xanthan gum. © 1988 Springer-Verlag.
Filiaciones:
Centro de Investigación sobre Ingenieria Genética y Biotecnología, Universidad Nacional Autónoma de México, Apdo. Post. 510-3, Cuernavaca, 62270, Mor., Mexico
Colegio de Posgraduados, Chapingo, Edo. de México, Mexico
Instituto de Química, Universidad Nacional Autónoma de México, México, D. F., Mexico
|