Rhizobacteria are plant–associated bacteria that are able to colonize and persist on roots. Plant Growth-
Promoting Rhizobacteria (PGPR) are root associated bacteria that colonize the rhizosphere and
improve plant growth when introduced onto seeds, seedpieces, roots, or into soil. PGPR improve plant
growth by one or more mechanisms: direct stimulation of plant growth; enhancement of nutrient uptake;
suppression of plant pathogens; and/or induction of resistance in plant hosts against pathogens. PGPR are
found in a very wide range of genera and some examples include: Acinetobacter, Agrobacterium,
Arthrobacter, Azospirillum, Bacillus, Bradyrhizobium, Burkholderia, Cellulomonas, Frankia, Pantoea,
Pseudomonas, Rhizobium, Serratia, Streptomyces, and Thiobacillus.
During the last four decades, PGPR research has brought together scientists from multiple disciplines,
who have addressed a wide range of topics including: discovery of novel PGPR strains and traits;
performance in greenhouse and field trials; production, formulation and delivery of inoculum; registration
and commercialization; mechanisms of growth promotion and biocontrol and their molecular and
biochemical basis; root colonization and rhizosphere competence traits; role of PGPR in suppressive
soils; plant, pathogen and rhizosphere community responses to PGPR; and recombinant PGPR and risk
assessment. Now a new chapter in PGPR research has began with the sequencing of the genomes of
several well-studied strains.
The latest developments in PGPR research have been presented at 7 previous PGPR Workshops held
around the world: Orillia, Ontario, Canada (1987); Interlaken, Switzerland (1990), Adelaide, Australia
(1994); Sapporo, Japan (1997); Cordoba, Argentina (2000); Calicut, India (2003); and Noordwijkerhout,
The Netherlands (2006).
The 8th International PGPR Workshop is the first time the meeting has been held in the United States. In
addition to the topics listed above, this meeting will focus on recent developm