Effects of "helper" microorganisms on rhizobial and actinorhizal nitrogen-fixing symbioses

SOLANS M, VOBIS G, WALL L.G.

Universidad de la Frontera, Pucón, Chile

Simposio; 5th International Symposium of Interactions of Soil Minerals with Organic Components and Microorganisms; 2008

Universidad de la Frontera

The aim of the present study was to examine the effect of saprophytic actinomycetes as ?helper? microorganisms on two different nitrogen-fixing-symbioses: rhizobial and actinorhizal. Experimental assays were carried out under laboratory conditions, employing the strains Streptomyces MM40, Actinoplanes ME3 and Micromonospora MM18, previously isolated from the rhizosphere of Ochetophila trinervis and characterized as rhizoactinomycetic microorganisms. Both symbiotic systems, Medicago sativa-Sinorhizobium meliloti and Ochetophila trinervis-Frankia were used. The plants were inoculated with the symbiotic strain