Rhizobacteria response to peanut rhizodeposition

DARDANELLI, M.S.; ALBORNOZ, A. ; MEDEOT, D. ; FUMERO, M.V. ; GARCÍA, M. ; PAULUCCI, N.S. ; BUENO, M.

Huerta Grande, Cordoba

Jornada; XVII Jornadas Científicas de la Sociedad de Biología de Córdoba.; 2009

Sociedad de Biología de Córdoba

Bacteria able to colonize plant root systems are referred to as rhizobacteria and include plant growth promoting rhizobacteria and the N2 -fixing rhizobio. Most rhizobacteria living in the rhizosphere and can be defined as any volume of soil specifically influenced by plant roots and/or in association with roots and hairs, and plant-produced material. Plant root-soil-microbe interactions are an important aspect of plant nutrient uptake strategies. The object of the present work was to contribute with the knowledge of physiological and biochemical response of rhizobacteria to peanuts under peanut rhizodeposition, in the presence and absence of saline stress (NaCl 50 mM). Rhizobacteria strains used were Azospirillum brasilense Cd and Bradyrhizobium SEMIA6144 and TAL1000. Viability, biomass, proteins, oligosaccharides profile and cellular trehalose were measured. Lipids were obtained and phospholipids were identified by TLC. Results indicated differences in rhizobacteria growth and profile proteins for the different experimental conditions. On the other hand, oligosaccharides periplasmic and trehalose were affected under saline peanut rhizodeposition and lipids pattern showed were similar. Results suggest that oligosaccharides and protein may be implicated in response to peanut rhizodeposition.