Effect of temperature and glucose concentration on the N-butanoyl-L-homoserine lactone production by Aeromonas hydrophila

摘要

N-butanoyl-L-homoserine lactone (C4-HSL) production by Aeromonas hydrophila 519 has been established. C4-HSL production at 22 and 30℃ was found after 20-24 h of incubation corresponding to a population density of ca. 10~8-10~9cfu/ml, respectively. Reduced C4-HSL production was noted after 72h of incubation at 12℃ when the culture reached ca. 10~9cfu/ml. No C4-HSL production was detected at 37℃, although a dense population was obtained. In LB broth supplemented with 0.1% and 0.5% glucose, C4-HSL production was noted whereas with 1% glucose no C4-HSL was detected although a high colony count was obtained. In the latter culture residual levels of glucose (0.65%) were found after 43 h whereas in the 0.1% and 0.5% supplemented LB, glucose was quickly consumed which may have stimulated C4-HSL production. In conclusion, the present study shows an effect of envircnmental conditions (temperature, glucose concentration) on the C4-HSL production and warrants further investigation to elucidate the effect of external conditions on production of AHL signal molecules to reveal the relevance of quorum sensing in, e.g. foods.