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:http://ibws.nexenservices.com/
http://sequence.toulouse.inra.fr/r.solanacearum.html
 
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.