Characterization of nodulating peanut rhizobia isolated from a native soil population in Córdoba, Argentina

TANIA TAURIAN, O. MARIO AGUILAR AND ADRIANA FABRA

SYMBIOSIS

Balaban Publishers

Año: 2002 vol. 33 p. 59 - 72

0334-5114

Abstract A total of 39 root nodule bacterial isolates were obtained from soils or Arachis hypogaea L. growing in fifteen different locations in Córdoba, Argentina. After authentication on homologous host species, the presence of nifD gene was analyzed, and their cultural and phyisiological properties were studied. About 46% of the isolates were fast-growers and produced an acid reaction in YEM medium. It was possible to differentiate this group from the slow growing isolates by their tolerance to environmental stresses (elevated concentrations of salt, acid pH and high temperature). The use of different carbon sources showed no differences among the isolates. Almost all the isolates were symbiotically effective with peanut and their nodulation ability in other legumes was also studied.