Glucose is most commonly used and all of the sugars are converted to in (a) Some cyanobacteria can use sugars in the dark. Physiologies of Beggiatoa and Oscillatoria that mediate against accepting suchĪ relationship at this time. Reserve judgment and point out some of the significant differences in the Studies may demonstrate the validity of such a relationship, we would like to Should be considered as an apochlorotic cyanobacterium. Nevertheless, one recent proposal (94) suggests that Beggiatoa
Similarities have felt it was too early to suggest that Beggiatoa are apochloroticĬyanobacteria but have felt that future studies may show such a relationship Some investigators who have noted the morphological Of trichome division by the production of necridia (116),and the production of Recently extended to include the structure of the cell wall (114,115), the mode
Oscillatoria has often been pointed out (84,86,93,94) with the suggestion thatīeggiatoa might be an apochlorotic cyanobacterium. The morphological similarity between Beggiatoa and the cyanobacterium The mol% guanine plusĬytosine of the DNA of strain B18LD is 41 (69). Versity collection is designated as the type strain. alba strain B18LD from the Louisiana State Uni Because of a lack of pure cultures andĭefinitive descriptions, only Beggiatoa alba is found in the Approved Lists ofīacterial Names (102) B. Trichome diameter, which ranges from about 1 /-Lm in Beggiatoa minima to as Differentiation of the recognized species is based solely on Nineteen species andįive varieties have been named,bUlt only six species are recognized by Bergey's Internally, move by gliding, and do not have a sheath. The genus Beggiatoa consists of trichomatous filaments that deposit sulfur Of this reawakening of interest in these bacteria and their activities.įor excellent brief descriptions of the genera and species described in thisĪrticle, as well as of other sulfur-oxidizing bacteria, see Fjerdingstad (30). it seems particularly timely to review the past literature at the outset Oxidizing bacteria in nature and the advent of collections of Beggiatoa and With the growing awareness of the role of sulfur Obtained in pure culture, and pure cultures of Thiothrix have been available for In contrast to Beggiatoa, Thioploca has never been Recently that a large collection of isolates has been obtained and comparative However, a lack of pure culturesĪnd the possible presence of organic material in his media prevented him fromĬonclusively demonstrating autotrophy until his later studies with the nitrifyingīeggiatoa strains have been isolated occasionally (13,19,28.40.43, 48,ħ5, 86, 87, 98, 115) and each has added to our knowledge. It was with Beggiatoa and Thiothrix that Winogradsky (126-128)ĭeveloped his initial concepts of autotrophy. Stood microbial group, these organisms also are of interest from a historical Moreover, physiological similarities among them areĪside from their interest as repmsentatives of an unusual and poorly under Trichomes that can attain great length and (c) all are motile by gliding at some Sulfur granules internally when in the presence of sulfide (b) all produce The similarities include the following: (a) All of the organisms deposit Morphological similarities among them that warrant their inclusion in a single Part, some of the basic features of these organisms. and ThioploĬa, have been the subjects of several recent studies that have clarified,at least in Members of the three remaining genera, Beggiatoa. Indistinguishable from Thiospirillopsis (W. Moreover, in pureĬultures of Beggiatoa we have occasionally seen spiraled filaments that were The type location,causing its validity to be questioned (56). (56, 121) in spite of examinations of many likely habitats, including revisits to The former probably has flagellaĪnd is therefore not a gliding organism (20). Matium and Thiospirillopsis from this review. However, we decided to exclude both Achro The purpos.e of this article is to review and bring up to date the literature on
Įnrichment and Isolation.Įcology and Distribution. For personal use only.ĭepartment of Microbiology, Louisiana State University, Baton Rouge, Louisiana,ĭepartment of Microbiology, Ohio State University, Columbus, Ohio 43210
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