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BIOLOGICAL CONTROL OF SOIL-BORNE PATHOGENS BY FLUORESCENT PSEUDOMONADS

Dieter Haas* and Geneviève Défago‡

Abstract |

Particular bacterial strains in certain natural environments prevent infectious diseases of plant roots. How these bacteria achieve this protection from pathogenic fungi has been analysed in detail in biocontrol strains of fluorescentpseudomonads. During root colonization, these bacteria produce antifungal antibiotics, elicit induced systemic resistance in the host plant or interfere specifically with fungal pathogenicityfactors. Before engaging in these activities, biocontrol bacteria go through several regulatory processes at the transcriptional and post-transcriptional levels.