Analysis of Rhizobium meliloti Sym Mutants Obtained by Heat Treatment.
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.
Toro
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Departamento de Microbiología, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008-Granada, Spain.
Olivares
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