title: The enhancement of conjugal plasmid pBHR1 transfer between bacteria in the presence of extracellular metabolic products produced by Microcystis aeruginosa.
abstract: Conjugal plasmid transfer from Escherichia coli S17-1 (pBHR1) to Pseudomonas stutzeri was investigated in the presence of a cyanophyta Microcystis aeruginosa. The plasmid transfer frequency increased with higher densities of M. aeruginosa. The extracellular metabolic products (EMPs) from M. aeruginosa were found to enhance the plasmid transfer between bacteria. Furthermore, the plasmid transfer frequency in medium containing EMPs was significantly higher than that in culture medium with or without glucose. These results suggest that M. aeruginosa enhances conjugal plasmid transfer between bacteria through its EMPs, and that identity of the carbon source is an important factor affecting conjugal plasmid transfer in aquatic environments.
authors.affiliation: Center for Ecological Research, Kyoto University, Kamitanakami, Otsu, Shiga 520-2113, Japan. m_ueki@ecology.kyoto-u.ac.jp
authors.forename: Masaya
authors.initials: M
authors.lastname: Ueki
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Matsui
authors.forename: Kwangsoon
authors.initials: K
authors.lastname: Choi
authors.forename: Zen'ichiro
authors.initials: Z
authors.lastname: Kawabata
mesh_terms: D002244:Carbon / Q000378:metabolism; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000235:genetics*; D022761:Gene Transfer, Horizontal; D046931:Microcystis / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics*; D044223:Pseudomonas stutzeri / Q000235:genetics*; D014871:Water Microbiology
chemical_list: D002244:Carbon