PMID: 8606173Apr 1, 1996Paper

Patterns of reporter gene expression in the phase diagram of Bacillus subtilis colony forms

Journal of Bacteriology
N H Mendelson, B Salhi

Abstract

Factors governing the morphogenesis of Bacillus subtilis colonies as well as the spatial-temporal pattern of expression of a reporter gene during colony development were examined by systematically varying the initial nutrient levels and agar concentrations (wetness), the relative humidity throughout incubation, and the genotype of the inoculum. A relationship between colony form and reporter gene expression pattern was found, indicating that cells respond to local signals during colony development as well as global conditions. The most complex colony forms were produced by motile strains grown under specific conditions such that cells could swim within the colony but not swarm outward uniformly from the colony periphery. The wetness of the growth environment was found to be a critical factor. Complex colonies consisted of structures produced by growth of finger-like projections that expanded outward a finite distance before giving rise to a successive round of fingers that behaved in a similar fashion. Finger tip expansion occurred when groups of cells penetrated the peripheral boundary. Although surfactin production was found to influence similar colony forms in other B. subtilis strains, the strains used here to study reporte...Continue Reading

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Citations

Jan 19, 1999·Annual Review of Microbiology·J A Shapiro
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·Y KozlovskyE Ben-Jacob
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