Trichodesmium thiebautii
Classification
Higher order taxa
Bacteria; Cyanobacteria; Cyanophyceae; Oscillatoriales; Microcoleaceae; Trichodesmium
Species
Trichodesmium thiebautii
Description and Significance
=Trichodesmium thiebautii was named and first described by M. Gomont in a paper published in 1892 (1). T. thiebautii is a gram-negative, coccus shaped marine cyanobacteria. T. thiebautii prefers warmer temperatures and has been found in tropical and subtropical oceans (5). T. thiebautii has been hard to study and does not have extensive research. Maintaining living cultures has been difficult. The longest any culture has survived is three months (3). T. thiebautii forms colonies. They have been found in the shape of fusiform and radial colonies. Fusiform colonies are the most abundant type. The T. thiebautii fusiform colonies are twisted like a rope (4). T. thiebautii has non-constricted trichomes surrounding the outside of its cell. The morphology of trichomes is similar within a colony, but varies between each different, separate colony (4,5). T. thiebautii are non-heterocystous and fix nitrogen gas. It fixes nitrogen gas during the day, which is unlike other cyanobacteria (2).
Genome and genetics
a. To what major branch of the prokaryotes do they belong? (see textbook or Bergey’s). List 2-3 closely related but separate species or genera of bacteria.
b. Briefly describe any extra-chromosomal elements or genetic tools that are used to study the bacterium: viruses, plasmids, transposons that allow genetic manipulation and analysis.
c. Has the genome or genomes been sequenced? If so, include the website for the database and one or two highlights of the genome. Also indicate genome size (base pairs), %G+C (nucleotide base composition) and number of genes, and specific genes or gene regions that are unique to this organism. If it has not been sequenced, give its closest relative that has been sequenced, its website, and some general information about the related sequence.
Example: The sequence of Haemophilus influenzae was determined using whole genome shotgun sequencing (Fleischmann et al. 1995).
Nutrition and metabolism
a.Describe the growth characteristics of your bacterial species; sources of C, N, electrons; respires/ferments, uses O2, etc.
b.What kinds of culture conditions (temp, pH, media) are needed for laboratory study?
c.What kinds of waste, by-products, volatile compounds are generated?
Ecology / Pathology
Ecology: How is your microorganism important in the ecosystem where it is found? How does it impact other organisms in the environment (could be positive or negative impact)?
Pathology: How does the microbe cause disease as it interacts with the host? Describe any specific toxins or pathways that are used for invading and causing disease in the host. What treatment is used to inhibit or kill the microbe?
Current Research
Describe recent research and findings that have been done with this organism. The research can be clinical, applied or basic research. This section should be based on 2 recent papers (10 years or less) and summarized in your own words.
References
1. Bergman, B., Carpenter, E. J., Larsson, J., Lin, S., Sandh, G. “Trichodesmium – a widespread marine cyanobacterium with unusual nitrogen fixation properties”. FEMS Microbial Rev. 2013 May; 37(3): 286-302 [PubMed] 2. Capone, D. G., Ferrier, M. D., Carpenter, E. J. “Amino Acid Cycling in Colonies of the Planktonic Marine Cyanobacterium Trichodesmium thiebautii”. Applied and Environmental Microbiology, Nov. 1994, p. 3989-3995. 3. Carpenter, E. J., McCarthy, J. J., Rueter, J. G. 1979. “The toxic effect of copper on Oscillatoria (Trichodesmium) theibautii”. Limnol. Oceanogr., 24(3):558-562. 4. Carpenter, E. J., Capone, D. G., Rueter, J. G. “Marine Pelagic Cyanobacteria: Trichodesmium and other Diazotrophs”. 1991. NATO ASI Series. Series C: Mathematical and Physical Sciences – Vol. 362. 5. Monteiro, J., Leca, E., Koening, M., Macedo, S. “New record of Trichodesmium thiebautii Gomont ex Gomont (Oscillatoriales – Cyanophyta) for the continental shelf of northeastern Brazil”. Acta Bot. Bras. vol.24 no.4 Feira de Santana Oct./Dec. 2010
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