Summary Gene expression profiles of the biological control strain P seudomonas protegens Pf ‐5 inhabiting pea seed surfaces were revealed using a whole‐genome oligonucleotide microarray. We identified genes expressed by Pf ‐5 under the control of two global regulators ( GacA and RpoS ) known to influence biological control and secondary metabolism. Transcript levels of 897 genes, including many with unknown functions as well a...

Summary The GacS/GacA signal transduction system is a central regulator in Pseudomonas spp., including the biological control strain P. fluorescens Pf‐5, in which GacS/GacA controls the production of secondary metabolites and exoenzymes that suppress plant pathogens. A whole genome oligonucleotide microarray was developed for Pf‐5 and used to assess the global transcriptomic consequences of a gacA mutation in P. fluorescens Pf...