ArticleApplied and environmental microbiology2001
Ecological physiology of Synechococcus sp. strain SH-94-5, a naturally occurring cyanobacterium deficient in nitrate assimilation.
Article in Applied and environmental microbiology, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 27 citations in OpenAlex.
- Bioactive Compounds from Red Microalgae with Therapeutic and Nutritional Value.Microorganisms · 2022Review
- Article
- Nitrite transport activity of the ABC-type cyanate transporter of the cyanobacterium Synechococcus elongatus.Journal of bacteriology · 2009Article
- Community phylogenetic analysis of moderately thermophilic cyanobacterial mats from China, the Philippines and Thailand.Extremophiles : life under extreme conditions · 2005Article
- Photosynthetic nitrate assimilation in cyanobacteria.Photosynthesis research · 2005Review
- Variation in sulfide tolerance of photosystem II in phylogenetically diverse cyanobacteria from sulfidic habitats.Applied and environmental microbiology · 2004Article
- Cyanobacterial diversity in natural and artificial microbial mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a morphological and molecular approach.Applied and environmental microbiology · 2003Article
- Modeling bacterial evolution with comparative-genome-based marker systems: application to Mycobacterium tuberculosis evolution and pathogenesis.Journal of bacteriology · 2003Article
- Clade-specific 16S ribosomal DNA oligonucleotides reveal the predominance of a single marine Synechococcus clade throughout a stratified water column in the Red Sea.Applied and environmental microbiology · 2003Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Synechococcus sp. strain SH-94-5 is a nitrate assimilation-deficient cyanobacterium which was isolated from an ammonium-replete hot spring in central Oregon. While this clone could grow on ammonium and some forms of organic nitrogen as sole nitrogen sources, it could not grow on either nitrate or nitrite, even under conditions favoring passive diffusion. It was determined that this clone does not express functional nitrate reductase or nitrite reductase and that the lack of activity of either enzyme is not due to inactivation of the cyanobacterial nitrogen control protein NtcA. A few other naturally occurring cyanobacterial strains are also nitrate assimilation deficient, and phylogenetic analyses indicated that the ability to utilize nitrate has been independently lost at least four times during the evolutionary history of the cyanobacteria. This phenotype is associated with the presence of environmental ammonium, a negative regulator of nitrate assimilation gene expression, which may indicate that natural selection to maintain functional copies of nitrate assimilation genes has been relaxed in these habitats. These results suggest how the evolutionary fates of conditionally expressed genes might differ between environments and thereby effect ecological divergence and biogeographical structure in the microbial world.
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