Gluconacetobacter johannae

Genus/species (aliases): Gluconacetobacter johannae

 

Gram Stain: Negative

Morphology:

  • Cell: rods with rounded ends, approximately 1.5-1.9 micrometer and 0.5-0.6 micrometer; occur singly, in pairs or in short chains. Motile by means of peritrichous flagella.
  • Colony: light brown to brown colonies.
  • Liquid Growth:

Physiological Traits:

Growth on:  good growth on ethanol, galactose, xylose,; moderate growth on raffinose, maltose; faint growth on arabinose, butanol, glycerol, mannitol, melibiose, sorbitol;  no growth: mannose

Ecological Traits:

Found in nature associated with plant materials; tolerant of  low pH and high concentrations of sugar found on grapes.

Distinguishing Features:

 

Role in wine: 

  Found in musts.

Sensitivities:

  • SO2:
  • Sorbate­­­­­:
  • DMDC:
  • pH: Yes
  • Acids: Yes
  • Ethanol: Yes
  • Anaerobiosis:
  • Heat: Yes

References:

Bergey’s manual of systematic bacteriology

Novel nitrogen-fixing acetic acid bacteria, Gluconacetobacter johannae sp. nov. and Gluconacetobacter azotocaptans sp. nov. associated with coffee plants= International Journal of Systematic and Evolutionary Microbiology (2001), 51, 1305–1314