| Literature DB >> 27020364 |
Ralph B Perkerson Iii1, Jeffrey R Johansen1, Lubomir Kovácik1, Jerry Brand1, Jan Kaštovský1, Dale A Casamatta1.
Abstract
The cyanobacteria are a diverse, ancient lineage of oxygenic, phototrophic bacteria. Ubiquitous in nearly all ecosystems, the alpha-level diversity of these organisms lags behind other algal lineages due to a perceived dearth of phylogenetically useful characters. Recent phylogenetic studies of species within the genus Leptolyngbya have demonstrated that this is a polyphyletic assemblage. One group of strains that fits within the current circumscription of Leptolyngbya is genetically and phylogenetically distinct from Leptolyngbya sensu stricto. Members of this clade possess both a morphological synapomorphy and shared 16S-23S internal transcribed spacer (ITS) secondary structure, allowing the diagnosis of the new cyanobacterial genus Nodosilinea. Members of this genus are united by the unique ability to form nodules along the length of the filament. This trait has been previously observed only in the species Leptolyngbya nodulosa Z. Li et J. Brand, and we have chosen this species as the generitype of Nodosilinea. We currently recognize four species in the genus, N. nodulosa (Z. Li et J. Brand) comb. nov., N. bijugata (Kong.) comb. nov., N. conica sp. nov., and N. epilithica sp. nov.Entities:
Keywords: 16S rRNA; 16S-23S ITS; Halomicronema; Leptolyngbya; Nodosilinea; Pseudanabaenales; cyanobacteria; rRNA secondary structure; systematics; taxonomy
Year: 2011 PMID： 27020364 DOI： 10.1111/j.1529-8817.2011.01077.x
Source DB: PubMed Journal: J Phycol ISSN： 0022-3646 Impact factor: 2.923