Morphology | Gluconobacter |
CELLULAR |
Staining | Gram-negative (in a few cases Gram-variable). |
Morphology | Cells ellipsoidal to rod shaped, 0.5-0.8 x 0.9-4.2 um, occurring singly and/or in pairs, rarely in chanisn. Enlarged, irregular cell forms (involution forms) may occur. |
Motility | Motile or nonmotile; if motile, the cells have 3-8 polar flagella, rarely a single flagellum. |
Specialized structures | Nonsporing. |
Division |
COLONIAL |
Solid surface | Colonies are pale. |
Liquid |
Growth Parameters | Gluconobacter |
PHYSIOLOGICAL |
Tropism | Chemoorganotrophic. Oxidize ethanol to acetic acid.* Do not oxidize acetate or lactate to CO2 and H2O |
Oxygen | Obligately aerobic, having a strictly respiratory type of metabolism with oxygen as the terminal electron acceptor |
pH | Optimum pH, 5.5-6.0; most strains will grow at pH 3.6 |
Temperature | Optimum temperature, 25=30`C; no growth at 37'C |
Requirements | |
Products | Strong ketogenesis occurs from poly- alcohols. Acid formation from D-glucose and D-xylose is pronounced (pH < 4.5). All strains produce 2-ketogluconic acid from D-glucose, and the majority of strains also form 5- ketogluconic acid. No acid production or growth occurs on lactose or starch |
Enzymes | Strongly catalase-positive. Oxidase-negative. Negative for nitrate reduction, gelatin liquefaction, indole production and H2S formation. |
Unique features |
ENVIRONMENTAL |
Habitat | Gluconobacter strains occur in flowers, garden soil baker's yeast, honey bees, fruits, cider, beer, wine, wine vinegar, South African Bantu beer, palmsap and soft |
Lifestyle | |
Pathogenicity | They cause pink disease in pineapple and rot in apples and pears. |
Distribution |
Genome | Gluconobacter |
G+C Mol % | 56-64 |
Reference | Gluconobacter |
First citation | Asai,T.(1935) Taxonomic studies on acetic acid bacteria and allied oxidative bacteria isolated from fruits, A new classification of the oxidative bacteria. J. Agr. Chem. Soc. Jpn. 11:499-513,610-620,674-708. |
Emended | Asai, T., H. Lizuka and K. Komaqata. 1964. The flagellation and taxonomy of the genera Gluconobacter and Acetobacter with reference to the existence of intermediate strains. J. Gen. Appl. Microbiol 10: 95-126 |
The Prokaryotes | p |
Bergey's Systematatic | p 275 J. De |Ley and J. Swings |
Bergey's Determinative | p 84 |
References |