A survey of Polytomella (Chlorophyceae, Chlorophyta) strains in public culture collections.

Polytomella is a genus of colorless green algae in the Reinhardtinia clade of the Chlamydomonadales, which has proven useful for a broad range of studies particularly those exploring the evolutionary loss of photosynthesis and mitochondrial genomics/biochemistry. Although 13 Polytomella strain accessions are currently available from public culture collections, the taxonomic status and redundancy of many of these strains is not clear because of possible mix-ups, deficient historical records, and incomplete molecular data. This study therefore considers previously available and/or new cox1 and mitochondrial DNA telomere sequences from all 13 Polytomella strain accessions.

Validation of Polytomella piriformis nomen nudum (Chlamydomonadaceae): a Distinct Lineage Within a Genus of Nonphotosynthetic Green Algae.

Polytomella strain SAG 63-10 was first described by Pringsheim (1963) as Polytomella piriformis nomen nudum. The current study validates the name Polytomella piriformis following the International Code of Nomenclature for algae, fungi, and plants (ICN). We present 18S rRNA sequences of SAG 63-10 and several other Polytomella strains, which, along with existing mitochondrial DNA sequences, clearly distinguishes P.

BioMiCo: a supervised Bayesian model for inference of microbial community structure.

Background: Microbiome samples often represent mixtures of communities, where each community is composed of overlapping assemblages of species. Such mixtures are complex, the number of species is huge and abundance information for many species is often sparse. Classical methods have a limited value for identifying complex features within such data.