Project description:We have analysed the global gene expression of the plant pathogen Dickeya dadantii 3937 when grown in vitro under different growth and stress conditions. A multi-factorial design with 32 different experimental conditions was constructed, with two biological replicates for each condition. Cells were grown to exponential phase or stationary phases in four different growth media: M63 supplemented with 0.2% sucrose as carbon source, with or without 0.2% (w/v) polygalacturonate (PGA) and with or without 0.1% Saintpaulia leaf extracts (1 g leaves in 1 L M63). Cells grown in these four media were subjected to different stresses: (i) acid stress, by an incubation of 15 min in the presence of 30 mM malic acid; (ii) oxidative stress, by an incubation of 15 min in the presence of 100 _M H2O2 or (iii) osmotic stress, by an incubation of 15 min in the presence of 300 mM NaCl. The micro-arrays used in this study were custom designed and produced by Roche NimbleGen, Inc. (Madison, WI) based on the annotated sequence of D. dadantii, available at Genbank accession number nM-! CP002038, which comprises 4597 CDS. The 4plex expression micro-arrays consist of 60-mer oligonucleotides, triplicated in three blocks on the array (5 oligonucleotides per CDS).
