Surface motility in Pseudomonas sp. DSS73 is required for efficient biological containment of the root-pathogenic microfungi Rhizoctonia solani and Pythium ultimum

Research output: Contribution to journalJournal articlepeer-review

Pseudomonas sp. DSS73 was isolated from the rhizoplane of sugar beet seedlings. This strain exhibits antagonism towards the root-pathogenic microfungi Pythium ultimum and Rhizoctonia solani. Production of the cyclic lipopeptide amphisin in combination with expression of flagella enables the growing bacterial culture to move readily over the surface of laboratory media. Amphisin is a new member of a group of dual-functioning compounds such as tensin, viscosin and viscosinamid that display both biosurfactant and antifungal properties. The ability of DSS73 to efficiently contain root-pathogenic microfungi is shown to arise from amphisin-dependent surface translocation and growth by which the bacterium can lay siege to the fungi. The synergistic effects of surface motility and synthesis of a battery of antifungal compounds efficiently contain and terminate growth of the microfungi.
Original languageEnglish
JournalMicrobiology
Volume149
Issue numberPt 1
Pages (from-to)37-46
Number of pages9
ISSN1350-0872
DOIs
Publication statusPublished - 2003

Bibliographical note

Keywords: Antibiosis; Bacterial Proteins; Beta vulgaris; Culture Media; Movement; Peptides, Cyclic; Pest Control, Biological; Plant Diseases; Plant Roots; Pseudomonas; Pythium; Rhizoctonia; Soil Microbiology; Transcription Factors

ID: 10615471