INSTITUTO DE BIOTECNOLOGIA Y BIOLOGIA MOLECULAR
Unidad Ejecutora - UE
congresos y reuniones científicas
Colonization of soybean roots by Bradyrhizobium japonicum expressing each one of its falgellar systems
ALTHABEGOITI M.J; COVELLI J.M; RIVILLA R; MARTÍN M; LODEIRO AR
Congreso; National Meeting of the Spanish Society of Nitrogen Fixation II Portuguese- Spanish Congress on Nitrogen Fixation; 2010
Sociedad Española de Fijación de Nitrógeno
Bradyrhizobium japonicum, the symbiont of soybean, has two flagellar systems. One of them possesses a flagellin of 33 kDa and has a thin filament, while the other, with a flagellin of 65 kDa has a thick filament. We obtained mutants in each of the flagellins, as well as a double mutant, in the background of the type strain USDA 110. We observed that the mutant that expressed the thick flagellum only was equally competitive as the wild type for soybean roots colonization, whereas all other mutants were less competitive. Since it is believed that the thin flagellum is required for swarming motility, our results suggest that this type of motility is not required for roots colonization.