title: Distribution of N-Acylhomoserine Lactone-Producing Fluorescent Pseudomonads in the Phyllosphere and Rhizosphere of Potato (Solanum tuberosum L.).
abstract: Four hundred and fifty nine isolates of fluorescent pseudomonads were obtained from the leaves and roots of potato plants. Of these, 20 leaf isolates and 28 root isolates induced violacein production in two N-acylhomoserine lactone (AHL)-reporter strains-Chromobacterium violaceum CV026 and VIR24. VIR24 is a new reporter strain for long N-acyl-chain-homoserine lactones, which can not be detected by CV026. Thin-layer chromatography revealed that the isolates produced multiple AHL molecules. We compared the 16S rRNA gene sequences of these isolates with sequences from a known database, and examined phylogenetic relationships. The AHL-producing isolates generally separated into three groups. Group I was mostly composed of leaf isolates, and group III, root isolates. Group II comprised both leaf and root isolates. There was a correlation between the phylogenetic cluster and the AHL molecules produced and some phenotypic characteristics. Our study confirmed that AHL-producing fluorescent pseudomonads could be distinguished in the phyllosphere and rhizosphere of potato plants.
authors.affiliation: National Agricultural Research Center for Hokkaido Region (NARCH), National Agriculture and Food Research Organization (NARO).
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Someya
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Morohoshi
authors.forename: Nobuya
authors.initials: N
authors.lastname: Okano
authors.forename: Eiko
authors.initials: E
authors.lastname: Otsu
authors.forename: Kazuei
authors.initials: K
authors.lastname: Usuki
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Sayama
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sekiguchi
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Ikeda
authors.forename: Shigeki
authors.initials: S
authors.lastname: Ishida