title: Analysis of Rhizobium meliloti Sym Mutants Obtained by Heat Treatment.
abstract: Deletions in the pSym megaplasmid of Rhizobium meliloti were produced at a high frequency, and their lengths varied according to incubation temperature. Morphological differentiation into large and small colonies occurred after heat treatment. Small colonies elicited pseudonodules on alfalfa roots.
authors.affiliation: Departamento de Microbiología, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008-Granada, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Toro
authors.forename: J
authors.initials: J
authors.lastname: Olivares