Dataset Information

Molecular phylogeny and a new Iranian species of Caudospora (Sydowiellaceae, Diaporthales).

ABSTRACT: For the first time, molecular phylogenetic data on the peculiar diaporthalean genus Caudospora are available. Macro- and microscopic morphology and phylogenetic multilocus analyses of partial nuc SSU-ITS-LSU rDNA, cal, ms204, rpb1, rpb2, tef1 and tub2 sequences revealed two distinct species of Caudospora, which are described and illustrated by light and scanning electron microscopy. Caudospora iranica is described as a new species from corticated dead twigs of Quercus sp. collected in Iran. It differs from the generic type, C. taleola, mainly by coarsely verrucose ascospores. The asexual morph of C. taleola on natural substrate is described and illustrated. Caudospora taleola is neotypified, and it is recorded from Iran for the first time. Phylogenetic analyses of a multigene matrix containing a representative selection of Diaporthales from four loci (ITS, LSU rDNA, rpb2 and tef1) revealed a placement of Caudospora within Sydowiellaceae.

SUBMITTER: Voglmayr H

PROVIDER: S-EPMC5963677 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Molecular phylogeny and a new Iranian species of Caudospora (Sydowiellaceae, Diaporthales).

Voglmayr Hermann H Mehrabi Mehdi M

Sydowia 20180501

For the first time, molecular phylogenetic data on the peculiar diaporthalean genus Caudospora are available. Macro- and microscopic morphology and phylogenetic multilocus analyses of partial nuc SSU-ITS-LSU rDNA, cal, ms204, rpb1, rpb2, tef1 and tub2 sequences revealed two distinct species of Caudospora, which are described and illustrated by light and scanning electron microscopy. Caudospora iranica is described as a new species fr ...[more]

PMID: 29795960

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Project description:BackgroundThe nematode Caenorhabditis elegans is a major laboratory model in biology. Only ten Caenorhabditis species were available in culture at the onset of this study. Many of them, like C. elegans, were mostly isolated from artificial compost heaps, and their more natural habitat was unknown.ResultsCaenorhabditis nematodes were found to be proliferating in rotten fruits, flowers and stems. By collecting a large worldwide set of such samples, 16 new Caenorhabditis species were discovered. We performed mating tests to establish biological species status and found some instances of semi-fertile or sterile hybrid progeny. We established barcodes for all species using ITS2 rDNA sequences. By obtaining sequence data for two rRNA and nine protein-coding genes, we determined the likely phylogenetic relationships among the 26 species in culture. The new species are part of two well-resolved sister clades that we call the Elegans super-group and the Drosophilae super-group. We further scored phenotypic characters such as reproductive mode, mating behavior and male tail morphology, and discuss their congruence with the phylogeny. A small space between rays 2 and 3 evolved once in the stem species of the Elegans super-group; a narrow fan and spiral copulation evolved once in the stem species of C. angaria, C. sp. 8 and C. sp. 12. Several other character changes occurred convergently. For example, hermaphroditism evolved three times independently in C. elegans, C. briggsae and C. sp. 11. Several species can co-occur in the same location or even the same fruit. At the global level, some species have a cosmopolitan distribution: C. briggsae is particularly widespread, while C. elegans and C. remanei are found mostly or exclusively in temperate regions, and C. brenneri and C. sp. 11 exclusively in tropical zones. Other species have limited distributions, for example C. sp. 5 appears to be restricted to China, C. sp. 7 to West Africa and C. sp. 8 to the Eastern United States.ConclusionsCaenorhabditis are "fruit worms", not soil nematodes. The 16 new species provide a resource and their phylogeny offers a framework for further studies into the evolution of genomic and phenotypic characters.

Dataset Information

Molecular phylogeny and a new Iranian species of Caudospora (Sydowiellaceae, Diaporthales).

Publications

Molecular phylogeny and a new Iranian species of <i>Caudospora</i> (Sydowiellaceae, Diaporthales).

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