Molecular systematics of oxygenic photosynthetic bacteria

The signal transducer PII and bicarbonate acquisition in Prochlorococcus marinus PCC 9511, a marine cyanobacterium naturally deficient in nitrate and nitrite assimilation a aThe GenBank accession number for the glnB gene sequence reported in this paper is AJ271089.

“…Although Prochlorococcus spp. lack phycobilisomes and synthesize divinyl derivatives of chlorophyll a and b as major photosynthetic pigments, they are assigned to the same phylum as cyanobacteria (Urbach et al, 1998 ;Turner, 1997). The GenBank accession number for the glnB gene sequence reported in this paper is AJ271089.…”

Tapinothrix clintonii sp. nov. (Pseudanabaenaceae, Cyanobacteria), a new species at the nexus of five genera.

“…This genus has become the home for a plethora of pseudanabaenacean species transferred from Lyngbya, Plectonema, and Phormidium because of their narrow, untapered trichomes forming simple sheaths. This genus has been said to be a polyphyletic assemblage (alBerTano & kováčik 1994;Turner 1997;WilmoTTe et al 1997;casTenholz 2001;Wilmotte & herdman 2001;TaTon et al 2003;casamaTTa et al 2005;komárek & anagnoStidiS 2005;Johansen et al 2008), but no revisionary work recognizing the separate clades as separate genera has been completed.…”

Molecular phylogeny of the heterocystous cyanobacteria (subsections IV and V) based on nifD

“…Many cyanobacteria fix nitrogen (diazotrophy) and they comprise one of the largest global suppliers of fixed nitrogen in the environment (Sprent & Sprent, 1990). In addition, some species of nitrogen-fixing cyanobacteria are involved in symbiotic relationships with many plant species and supply the host directly with a source of reduced nitrogen.The taxonomy of the cyanobacteria has been debated vigorously and revised many times (Golubic, 1976;Turner, 1997). The cyanobacteria have been reclassified by using bacteriological instead of botanical criteria, based on morphological and developmental features, but most species, including those used in this study, have not yet been given validly published names under the Bacteriological Code.…”

“…The taxonomy of the cyanobacteria has been debated vigorously and revised many times (Golubic, 1976;Turner, 1997). The cyanobacteria have been reclassified by using bacteriological instead of botanical criteria, based on morphological and developmental features, but most species, including those used in this study, have not yet been given validly published names under the Bacteriological Code.…”

“…This is exemplified by Nostoc strain PCC 7120, which was formerly considered to be a species of Anabaena (Lachance, 1981;Rippka, 1988;Rippka & Herdman, 1992;Turner, 1997;Zehr et al, 1997;Tamas et al, 2000;Henson et al, 2002), and by Nostoc strain PCC 6720, which was once described as Anabaenaopsis (Rippka et al, 1979). The nifD phylogeny presented here supports the monophyly of the heterocystous cyanobacteria, which is congruent with 16S rRNA phylogenies (Giovannoni et al, 1988;Wilmotte, 1994;Nelissen et al, 1996;Turner, 1997;Turner et al, 1999;Wilmotte & Herdman, 2001; K. C. Kenyon, L. E. Watson & S. R. Barnum, unpublished results), 23S rRNA gene sequences (K. C. Kenyon, L. E. Watson & S. R. Barnum, unpublished results) and partial nifH sequences (Zehr et al, 1997(Zehr et al, , 1998(Zehr et al, , 2000. However, nifD does not support the monophyly of subsection V, which is congruent with nifH results (Zehr et al, 1997(Zehr et al, , 1998(Zehr et al, , 2000, but incongruent with 16S rRNA phylogenies.…”