Abstract
Morphological mutants of Caulobacter crescentus were isolated by selecting for cells that did not possess normal, buoyancy-conferring stalks. The most prevalent phenotype enriched by the selection was structurally deficient stalks (designated "Cds"), observable as crumpled or flattened stalks. The second phenotype ("Abs") was observed as spontaneous shedding of normal-appearing stalks. Third, one mutant ("Ecs") was isolated that sheds not only stalks, but also miniature stalked and nonstalked cells.
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