Molecular Plant Pathology – Pathogen Profiles

Ralstonia solanacearum: secrets of a major pathogen unveiled by analysis of its genome

Stephane Genin and Christian Boucher

Laboratoire de Biologie Moléculaire des Relations Plantes-Microorganismes, INRA-CNRS, BP27, 31326 Castanet-Tolosan Cedex, France

Taxonomy:Bacteria; Proteobacteria; ßsubdivision; Ralstonia group; genus Ralstonia
Microbial properties:Gram-negative, aerobic, motile rod.
Disease symptoms:Agent of bacterial wilt of solanaceous plants, which appears as a sudden wilt. Typically, stem crosssections ooze a whitish bacterial exudate. R. solanacearum is also the agent of the Moko disease of banana and brown rot of potato.
Disease control:Pathogen-free seed and transplants. Few resistant and tolerant plant lines. Sanitation and cultural rotations.
Useful web sites:
Symptoms caused by R. solanacearum on tomato (A) and 
by R. solanacearum strain GMI1000 on Arabidopsis thaliana 
ecotype Columbia (B). Typical wilting symptoms can be 
observed 5–6 days after inoculation.