Production of Extracellular Nucleic Acids by Genetically Altered Bacteria in Aquatic-Environment Microcosms

摘要

Factors which affect the production of extracellular DNA by genetically altered strains of escherichia coli, pseudomonas aeruginosa, pseudomonas cepacia, and bradyrhizobium japonicum in aquatic environments were investigated. The presence or absence of the ambient microbial community had little effect on the production of extracellular DNA. Results indicate the extracellular-DNA production by genetically altered bacteria released into aquatic environments is more strongly influenced by physiochemical factors than biotic factors; extracellular-DNA production rates are usually greater for organisms released in freshwater than marine environments; and ambient microbial populations can readily utilize materials released by these organisms.