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The reverse transcription quantitative PCR results revealed that the rpoS gene in biofilm Salmonella cells on all desiccation adaption days and in planktonic Salmonella cells on day 7 of dry storage was significantly upregulated (P 0.05). The rpoE, grpE, and invA genes in Salmonella cells in both physiological states were significantly down-regulated (P 0.05). Physiological state and storage time might affect expression of these genes. Prior exposure to adverse conditions, including low water activity, and the physiological sta