Resumen

TONIUTTI, M. A et al. Caracterización  fenotípica y funcional de rizobios noduladores  de dos especies del género Macroptilium. FAVE. Secc. Cienc. agrar. [online]. 2015, vol.14, n.1. ISSN 1666-7719.

Functional and phenotypic characterization of nodular rhizobia from two species of macroptiliun genus Macroptilium atropurpureum y Macroptilium bracteatum are legumes of forage interest recognized for their ability to fix atmospheric nitrogen in symbiotic relationships with rhizobacteria. Isolates coming from nodules of both Macroptilium species were characterized functional and phenotypically. The nineteen strains studied showed small colonies which were translucent, a bit gummy and low growth. In the grouping test, the previous strains clearly differed from the isolates under investigation. These gathered, making four mixtures according to the speed of growth, temperature tolerance, pH levels, salt concentration and resistance to different antibiotics. Seven isolates capable of growing under conditions of high temperature, alkalinity and / or salinity which would have a potential use as biofertilizers were identified.

Palabras clave : Macroptilium artropurpureum; Macroptilium bracteatum; Rhizobia; Phenotypic; Tolerance to abiotic factors.