Cellular Factors Affecting Nitrogen Fixation in the Blue-Green Alga Chlorogloea fritschii

Fay, P.; Kumar, H. D.; Fogg, G. E.

doi:10.1099/00221287-35-2-351

Cited by 43 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structure and development of Chlorogloeopsis fritschii, type species of this monotypic genus, were well described by Mitra (1950), Fay et al (1964) and by Mitra & Pandey (1966). Recently, Evans et al (1976) studied the effect of culture conditions on the morphology of Chlorogloeopsis fritschii (strain PCC 69 12) and found that the filamentous phase of development is repressed under photoheterotrophic and chemoheterotrophic growth conditions.…”

Section: Reference Strain: Pcc 7102mentioning

confidence: 80%

Generic Assignments, Strain Histories and Properties of Pure Cultures of Cyanobacteria

et al. 1979

View full text Add to dashboard Cite

On the basis of a comparative study of 178 strains of cyanobacteria, representative of this group of prokaryotes, revised definitions of many genera are proposed. Revisions are designed to permit the generic identification of cultures, often difficult through use of the field-based system of phycological classification. The differential characters proposed are both constant and readily determinable in cultured material. The 22 genera recognized are placed in five sections, each distinguished by a particular pattern of structure and development. Generic descriptions are accompanied by strain histories, brief accounts of strain properties, and illustrations; one or more reference strains are proposed for each genus. The collection on which this analysis was based has been deposited in the American Type Culture Collection, where strains will be listed under the generic designations proposed here. I N T R O D U C T I O NThe cyanobacteria constitute one of the largest sub-groups of Gram-negative prokaryotes. As a result of their traditional assignment to the algae, the classification of these organisms was developed by phycologists, working under the provisions of the Botanical Code (Stafleu et al., 1972). Almost entirely on the basis of observations on field materials, about 150 genera and well over lo00 species have been described. The discriminatory properties, both generic and specific, are either structural or ecological, these being virtually the only characters determinable in the field. Types are represented by herbarium specimens or, failing these, by descriptions and illustrations; cultures are not recognized as valid type materials under the Botanical Code.The attempt to identify cyanobacteria in culture through this field-based system of classification leads to many difficulties and ambiguities. The limited and necessarily provisional taxonomic goal of the present article is to redefine certain cyanobacterial genera in such a way that simple and clear-cut generic assignments can be made for cultures. It is based on our experience over the past decade with pure strains representative of all major sub-groups of cyanobacteria. As far as possible, we have attempted to maintain the system of generic nomenclature and the generic definitions now used by phycologists (Bourrelly, 1970;Geitler, 1932;Desikachary, 1959). However, when the discriminatory characters that nominally distinguish two genera are either not determinable on cultures or within the range of variation of a single strain, the existing genera have been combined. Some of the proposed generic definitions include discriminatory characters that have not hitherto received taxo-

show abstract

Section: Reference Strain: Pcc 7102mentioning

confidence: 80%

Generic Assignments, Strain Histories and Properties of Pure Cultures of Cyanobacteria

et al. 1979

View full text Add to dashboard Cite

show abstract

“…The first descriptions of this organism described filamentous and irregular clumps of cells (Mitra, 1950;Mitra & Pandey, 1966) and the transitions between cell types led to the suggestion of a 'life-cycle' in which the filamentous character gave way to large groups of polygonal cells (Fay, Kumar & Fogg, 1964;Fogg et al 1973). The change from mobile, filamentous cells to larger immobile aseriate types forms the basis of a complex life-cycle in Nostoc muscorum G (see Lazaroff,1g73), changes between those morphological types being initiated by red light and reversed by green light.…”

Section: Introductionmentioning

confidence: 99%

Environmental Conditions and Morphological Variation in the Blue-Green Alga Chlorogloea fritschii

Evans

Foulds

Carr

1976

Journal of General Microbiology

View full text Add to dashboard Cite

SUMMARYThe effect of environmental conditions on the morphology of the blue-green alga Chlorogloea fritschii is described. Availability of reduced carbon substrate, light and nitrogen all caused alteration in cell type, as did increase in temperature. The two major cell types were irregular clumps of cells (aseriate), and filaments; in photoautotrophic conditions the former predominated during exponential growth at 34 "C. The presence of sucrose imposed aseriate morphology in both phototrophic and heterotrophic cultures. The development of differentiated cells (heterocysts) following deprivation of nitrate and the interrelationships between different cell types are described.

show abstract

“…Investigations of the heterotrophic growth of Tolypothrix tenuis by Kiyohara, Fujita, Hattori & Watanabe (1960, 1962, another blue-green alga known for its ability to fix molecular nitrogen, were made in the presence of combined nitrogen but no account was given about attempts to grow the alga in nitrogen-free medium in the dark. When Fay & Fogg (1962) found that the blue-green alga known as Chlorogloea fritschii (but see Fay, Kumar & Fogg, 1964) was able to fix nitrogen not only in the light but also in the dark, it was thought desirable to examine the conditions of heterotrophic growth and nitrogen fixation by this alga.…”

Section: Introductionmentioning

confidence: 99%

Heterotrophy and Nitrogen Fixation in Chlorogloea fritschii

Fay

1965

Journal of General Microbiology

Self Cite

137

View full text Add to dashboard Cite

SUMMARYThe blue-green alga Chlorogloea fritschii fixed elementary nitrogen to a limited extent in the dark in a strictly inorganic medium. Growth and nitrogen fixation continued in the dark when a suitable organic substrate was present in the medium. Among the organic substrates tested, sucrose ( 0 . 0 1~) was the most readily utilized and was outstanding in supporting nitrogen fixation in the dark. The alga was adapted to heterotrophic conditions after continuous incubation and repeated subcultivation in the dark. Inter-relations between carbon assimilation and nitrogen fixation under heterotrophic conditions were observed.

show abstract

Cellular Factors Affecting Nitrogen Fixation in the Blue-Green Alga Chlorogloea fritschii

Cited by 43 publications

References 11 publications

Generic Assignments, Strain Histories and Properties of Pure Cultures of Cyanobacteria

Generic Assignments, Strain Histories and Properties of Pure Cultures of Cyanobacteria

Environmental Conditions and Morphological Variation in the Blue-Green Alga Chlorogloea fritschii

Heterotrophy and Nitrogen Fixation in Chlorogloea fritschii

Contact Info

Product

Resources

About