Bacterial genomics and adaptation to life on plants: implications for the evolution of pathogenicity and symbiosis.

Many bacteria form intimate associations with plants. Despite the agricultural and biotechnological significance of these bacteria, no whole genome sequences have yet been described. Plant-associated bacteria form a phylogenetically diverse group, with representative species from many major taxons. Sequence information from genomes of closely related bacteria, in combination with technological developments in the field of functional genomics, provides new opportunities for determining the origin and evolution of traits that contribute to bacterial fitness and interactions with plant hosts.