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Evidence for two domains of growth temperature for the psychrotrophic bacterium Pseudomonas fluorescens MF0.

Author(s) : GUILLOU C., GUESPIN-MICHEL J. F.

Type of article: Article

Summary

The variations in the maximal specific growth rate of the psychrotrophic bacterium Pseudomonas fluorescens MF0 with respect to temperature were studied between 0 and 30 deg C (optimal for growth). The Arrhenius plot showed a drastic change in slope at the intermediate temperature of 17 deg C. Over the cold domain from 0 to 17 deg C, the temperature characteristic was twofold higher than over the suboptimal domain from 17 to 30 deg C. The macromolecular composition of exponentially growing cells was invariant over the entire range from 0 to 30 deg C. An original biphasic variation of total protein concentration was demonstrated in strain MF0 with respect to temperature, with a maximum at 17 to 20 deg C. Indeed, increasing the temperature in the chemostat resulted in a biphasic decrease in the net protein production rate: a very slight decrease below 17 deg C and a much larger decrease from 17 to 28 deg C. These results could signify an increase in the cellular protein degradation rate with increasing temperature, especially above 17 deg C.

Details

  • Original title: Evidence for two domains of growth temperature for the psychrotrophic bacterium Pseudomonas fluorescens MF0.
  • Record ID : 1997-0816
  • Languages: English
  • Source: Appl. environ. Microbiol. - vol. 62 - n. 9
  • Publication date: 1996/09

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