RNA chaperone Hfq which encoded by hfq gene is involved in many intracellular metabolic processes by promoting the interaction between protein or non-coding RNA and target m RNA, regulating the stability of m RNAs. Previous studies indicated that Hfq could affect nitrogen fixation efficiency and the interaction between nitrogen-fixing microbes and plants. Pseudomonas stutzeri A1501 has a Hfq homologous protein, a hfq mutant was constructed and used to detect physiological and biochemical traits, express and...