Nitrogen Fixation by
            <i>Gloeocapsa</i>

Wyatt, J. T.; Silvey, J. K. G.

doi:10.1126/science.165.3896.908

Cited by 161 publications

(53 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sheath formation is both stable and constant in culture, being possessed by strains some of which have been maintained for 15 years. The five Gloeothece strains of the collection also share a distinctive physiological property not possessed by any other strains of Section I: the ability to fix nitrogen aerobically (Wyatt & Silvey, 1969;Rippka et al, 1971). This may eventually prove to be a second discriminatory character of Gloeothece.…”

Section: Genera Of Section Imentioning

confidence: 99%

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: Genera Of Section Imentioning

confidence: 99%

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

et al. 1979

View full text Add to dashboard Cite

show abstract

“…However, the heterocyst, having lost the ability to assimilate CO2, can no longer synthesize the organic compounds required both as electron donors for the reduction of Nz, and for the synthesis of organic nitrogenous compounds from ammonia. For these, the heterocyst is dependent on the intracellular transfer of organic metabolites formed through CO2 fixation in the neighboring vegetative cells (54). In turn, the vegetative cells obtain from the heterocyst their combined nitrogen supply.…”

Section: Nitrogen Fixationmentioning

confidence: 99%

The position of cyanobacteria in the world of phototrophs

Stanier

1977

Carlsberg Res. Commun.

View full text Add to dashboard Cite

Recent advances in our knowledge of the biological properties of the cyanobacteria (former ,blue-green algae,) are reviewed. The subjects discussed include: cyanobacterial cell structure and development; comparative aspects of photosyntetic structure and function in prokaryotes; carbon metabolism and its relation to obligate photoautotrophy; and special properties of cyanobacteria that are of ecological significance (temperature relationships, nitrogen fixation and facultative anoxygenic photosynthesis).

show abstract

“…The first report of a unicellular species being capable of nitrogen fixation was that of Wyatt and Silvey (1969) who demonstrated nitrogenase activity in Gloeocapsa (syn. Gloeothece, Cyanothece).…”

Section: Unicellular Cyanobacteriamentioning

confidence: 99%

Nitrogen fixing cyanobacteria: their diversity, ecology and utilisation with special reference to rice cultivation

Kulasooriya¹,

Magana-Arachchi²

2016

J. Natn. Sci. Foundation Sri Lanka

View full text Add to dashboard Cite

organisms. The role of N 2 fixing cyanobacteria are exemplified by the significant contribution they make to the nitrogen budget of the oceans, which occupy more than 80 % of the Earth's surface. Cyanobacteria are also found in freshwater and terrestrial habitats spanning across all latitudes and longitudes of the world and contribute significantly to the carbon and nitrogen cycles of wetlands, freshwater and brackish ecosystems as free-living, symbiotic, epiphytic, benthic and periphyton organisms. Certain N 2 fixing cyanobacteria form blooms in lentic water bodies and some of them produce cyanotoxins. N 2 fixing cyanobacteria therefore play both positive and negative roles in nature.Cyanobacteria form symbiotic associations with all other major groups of organisms and contribute to the nutrition of their hosts. Certain cyanobacteria and their symbiotic systems like Azolla are used as biofertilizers, particularly in rice production. This paper is a review of literature on N 2 fixing cyanobacteria, their diversity, their roles in nature and their utilisation.

show abstract

Nitrogen Fixation by Gloeocapsa

Cited by 161 publications

References 20 publications

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

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

The position of cyanobacteria in the world of phototrophs

Nitrogen fixing cyanobacteria: their diversity, ecology and utilisation with special reference to rice cultivation

Contact Info

Product

Resources

About