Two new species of Phyllonema (Rivulariaceae, Cyanobacteria) with an emendation of the genus
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
Grant support
UNAM - International
IN225317
DGAPA Project PAPIIT - International
15-11912S
Czech Science Foundation - International
PubMed
30055049
DOI
10.1111/jpy.12769
Knihovny.cz E-resources
- Keywords
- Phyllonema, 16S-23S ITS, ITS secondary structure, Mexico, Oaxaca, Rivulariaceae, Scytonemataceae, cyanobacteria,
- MeSH
- Algal Proteins analysis MeSH
- Phylogeny MeSH
- DNA, Ribosomal Spacer analysis MeSH
- RNA, Algal analysis MeSH
- RNA, Ribosomal, 16S analysis MeSH
- Protein Structure, Secondary MeSH
- Sequence Analysis, RNA MeSH
- Cyanobacteria classification cytology genetics ultrastructure MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Geographicals
- Mexico MeSH
- Names of Substances
- Algal Proteins MeSH
- DNA, Ribosomal Spacer MeSH
- RNA, Algal MeSH
- RNA, Ribosomal, 16S MeSH
Two untapered, heterocytous species were observed and collected from the intertidal and supratidal zones of the Mexican coastline of the Pacific Ocean near Oaxaca and from the Gulf of Mexico. These populations were highly similar in morphology to the freshwater taxon Petalonema incrustans in the Scytonemataceae. However, 16S rRNA sequence data and phylogenetic analysis indicated that they were sister taxa to the epiphyllic, Brazilian species Phyllonema aveceniicola in the Rivulariaceae, described from culture material. While genetic identity between the two new species was high, they differed significantly in morphology, 16S rRNA gene sequence identity, and sequence and structure of the 16S-23S ITS region. Their morphology differed markedly from the generitype of the previously monotypic Phyllonema, which has tapered, heteropolar, single-false branched trichomes with very thin or absent sheath. The two new species, Phyllonema ansata and Phyllonema tangolundensis, described from both culture and environmental material, have untapered, isopolar, geminately false branched trichomes with thick, lamellated sheaths, differences so significant that the species would not be placed in Phyllonema without molecular corroboration. The morphological differences are so significant that a formal emendation of the genus is required. These taxa provide a challenge to algal taxonomy because the morphological differences are such that one would logically conclude that they represent different genera, but the phylogenetic evidence for including them all in the same genus is conclusive. This conclusion is counter to the current trend in algal taxonomy in which taxa with minor morphological differences have been repeatedly placed in separate genera based primarily upon DNA sequence evidence.
References provided by Crossref.org
GENBANK
KT936571, KT936577, MG745301, MG745303, KT936575, MG754003