IBBM 21076
INSTITUTO DE BIOTECNOLOGIA Y BIOLOGIA MOLECULAR
Unidad Ejecutora - UE
artículos
Título:
Two effects of combined nitrogen on adhesion of Rhizobium etli to bean roots
Autor/es:
PÉREZ GIMÉNEZ, JULIETA; LODEIRO, A.R.
Revista:
SYMBIOSIS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2013 vol. 59 p. 157 - 163
ISSN:
0334-5114
Resumen:
The rhizobia-legume symbiosis is negatively influenced by combined forms of nitrogen (N). Theseeffects are known for nodulation and N2 fixation, but little is known for the preinfection events.Here we studied the effects of this nutrient on adhesion of Rhizobium etli to common bean(Phaseolus vulgaris L.) roots. When KNO3 or Na-glutamate was added to an incubation mixture ofrhizobia and plants that were previously grown in N-free solution, rhizobial adhesion to roots wassynergistically stimulated by both N-sources. However, rhizobial adhesion to bean rootspreviously grown with 10 mM KNO3 was reduced to one-half. A thermolabile macromoleculelarger than 12 kDa released in the bean root exudates stimulated rhizobial adhesion, but thisstimulatory activity was absent in root exudates obtained with 10 mM KNO3.
