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Appl Environ Microbiol. 1980 May; 39(5): 1035-1041

Bacterial Predators of Micrococcus luteus in Soil {dagger}

L. E. Casida Jr.

1 Department of Microbiology, The Pennsylvania State University, University Park, Pennsylvania 16802

ABSTRACT

Micrococcus luteus cells died relatively rapidly when they were added to natural soil. Microscopic observation showed that the cells were being physically destroyed by bacterial predators in the soil. Two of these predators were responsible for the initial, main attack, and they were isolated. The isolates on laboratory media lysed M. luteus cells in a manner similar to the attacks that occurred in soil. Neither predator was obligate, however, nor were they nutritionally fastidious. One of these bacteria produced mycelium and conidia. Under nutritionally poor conditions it used slender filaments of mycelium to seek out host cells. It had at least some of the characteristics of a Streptoverticillium species. The other bacterium was a short, gram-negative rod that did not easily fit into any of the known groups of gram-negative bacteria. It attached to host cells, but its mechanism of lysing these cells is not known.

FOOTNOTES

{dagger} Paper no. 5880 in the journal series of the Pennsylvania Agriculture Experiment Station.

Appl Environ Microbiol. 1980 May; 39(5): 1035-1041




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