The bacterium that produces phazolicin is an unidentified species of Rhizobium. It was isolated in a tropical forest in Los Tuxtlas, Mexico, from the roots of wild beans called Phaseolus vulgaris.
Like other Rhizobium species, this bacterium forms nodules on bean plant roots and provides plants with nitrogen, making them grow more robustly than others. Unlike other species of Rhizobium, it also defends plants from harmful bacteria sensitive to phazolicin.
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