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Phylogenetic circumscription of Arthrographis (Eremomycetaceae, Dothideomycetes).

Giraldo A, Gené J, Sutton DA, Madrid H, Cano J, Crous PW, Guarro J - Persoonia (2014)

Bottom Line: Based on these results, four new species are recognised, namely Arthrographis chlamydospora, A. curvata, A. globosa and A. longispora.Arthrographis longispora also produces membranous colonies, but has poorly differentiated conidiophores and long arthroconidia.Morphological variants are described for A. kalrae and our results also revealed that Eremomyces langeronii and A. kalrae, traditionally considered the sexual and asexual morphs of the same species, are not conspecific.

View Article: PubMed Central - PubMed

Affiliation: Unitat de Micologia, Facultat de Medicina i Ciències de la Salut and IISPV, Universitat Rovira i Virgili, Sant Llorenç 21, 43201 Reus, Tarragona, Spain;

ABSTRACT
Numerous members of Ascomycota and Basidiomycota produce only poorly differentiated arthroconidial asexual morphs in culture. These arthroconidial fungi are grouped in genera where the asexual-sexual connections and their taxonomic circumscription are poorly known. In the present study we explored the phylogenetic relationships of two of these ascomycetous genera, Arthrographis and Arthropsis. Analysis of D1/D2 sequences of all species of both genera revealed that both are polyphyletic, with species being accommodated in different orders and classes. Because genetic variability was detected among reference strains and fresh isolates resembling the genus Arthrographis, we carried out a detailed phenotypic and phylogenetic analysis based on sequence data of the ITS region, actin and chitin synthase genes. Based on these results, four new species are recognised, namely Arthrographis chlamydospora, A. curvata, A. globosa and A. longispora. Arthrographis chlamydospora is distinguished by its cerebriform colonies, branched conidiophores, cuboid arthroconidia and terminal or intercalary globose to subglobose chlamydospores. Arthrographis curvata produced both sexual and asexual morphs, and is characterised by navicular ascospores and dimorphic conidia, namely cylindrical arthroconidia and curved, cashewnut-shaped conidia formed laterally on vegetative hyphae. Arthrographis globosa produced membranous colonies, but is mainly characterised by doliiform to globose arthroconidia. Arthrographis longispora also produces membranous colonies, but has poorly differentiated conidiophores and long arthroconidia. Morphological variants are described for A. kalrae and our results also revealed that Eremomyces langeronii and A. kalrae, traditionally considered the sexual and asexual morphs of the same species, are not conspecific.

No MeSH data available.


Arthrographis longispora UTHSC 05-3220. a, b. Colonies on PDA and MEA 2 %, respectively, after 21 d at 25 °C; c, d. poorly differentiated conidiophores; e, f. cylindrical arthroconidia with truncate or rounded ends. — Scale bars = 10 μm.
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Figure 7: Arthrographis longispora UTHSC 05-3220. a, b. Colonies on PDA and MEA 2 %, respectively, after 21 d at 25 °C; c, d. poorly differentiated conidiophores; e, f. cylindrical arthroconidia with truncate or rounded ends. — Scale bars = 10 μm.

Mentions: The lineage representing Arthrographis sp. II (UTHSC 05-3220), produced membranous colonies in all the media tested (Fig. 7a, b), conidiophores poorly differentiated (Fig. 7c, d) and arthroconidia longer (5–10(–13) μm) than those of the members of A. kalrae clade (Fig. 7e, f). In this strain, as in Arthrographis sp. III and Arthrographis sp. IV, the production of a trichosporiella-like synasexual morph was not observed.


Phylogenetic circumscription of Arthrographis (Eremomycetaceae, Dothideomycetes).

Giraldo A, Gené J, Sutton DA, Madrid H, Cano J, Crous PW, Guarro J - Persoonia (2014)

Arthrographis longispora UTHSC 05-3220. a, b. Colonies on PDA and MEA 2 %, respectively, after 21 d at 25 °C; c, d. poorly differentiated conidiophores; e, f. cylindrical arthroconidia with truncate or rounded ends. — Scale bars = 10 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150071&req=5

Figure 7: Arthrographis longispora UTHSC 05-3220. a, b. Colonies on PDA and MEA 2 %, respectively, after 21 d at 25 °C; c, d. poorly differentiated conidiophores; e, f. cylindrical arthroconidia with truncate or rounded ends. — Scale bars = 10 μm.
Mentions: The lineage representing Arthrographis sp. II (UTHSC 05-3220), produced membranous colonies in all the media tested (Fig. 7a, b), conidiophores poorly differentiated (Fig. 7c, d) and arthroconidia longer (5–10(–13) μm) than those of the members of A. kalrae clade (Fig. 7e, f). In this strain, as in Arthrographis sp. III and Arthrographis sp. IV, the production of a trichosporiella-like synasexual morph was not observed.

Bottom Line: Based on these results, four new species are recognised, namely Arthrographis chlamydospora, A. curvata, A. globosa and A. longispora.Arthrographis longispora also produces membranous colonies, but has poorly differentiated conidiophores and long arthroconidia.Morphological variants are described for A. kalrae and our results also revealed that Eremomyces langeronii and A. kalrae, traditionally considered the sexual and asexual morphs of the same species, are not conspecific.

View Article: PubMed Central - PubMed

Affiliation: Unitat de Micologia, Facultat de Medicina i Ciències de la Salut and IISPV, Universitat Rovira i Virgili, Sant Llorenç 21, 43201 Reus, Tarragona, Spain;

ABSTRACT
Numerous members of Ascomycota and Basidiomycota produce only poorly differentiated arthroconidial asexual morphs in culture. These arthroconidial fungi are grouped in genera where the asexual-sexual connections and their taxonomic circumscription are poorly known. In the present study we explored the phylogenetic relationships of two of these ascomycetous genera, Arthrographis and Arthropsis. Analysis of D1/D2 sequences of all species of both genera revealed that both are polyphyletic, with species being accommodated in different orders and classes. Because genetic variability was detected among reference strains and fresh isolates resembling the genus Arthrographis, we carried out a detailed phenotypic and phylogenetic analysis based on sequence data of the ITS region, actin and chitin synthase genes. Based on these results, four new species are recognised, namely Arthrographis chlamydospora, A. curvata, A. globosa and A. longispora. Arthrographis chlamydospora is distinguished by its cerebriform colonies, branched conidiophores, cuboid arthroconidia and terminal or intercalary globose to subglobose chlamydospores. Arthrographis curvata produced both sexual and asexual morphs, and is characterised by navicular ascospores and dimorphic conidia, namely cylindrical arthroconidia and curved, cashewnut-shaped conidia formed laterally on vegetative hyphae. Arthrographis globosa produced membranous colonies, but is mainly characterised by doliiform to globose arthroconidia. Arthrographis longispora also produces membranous colonies, but has poorly differentiated conidiophores and long arthroconidia. Morphological variants are described for A. kalrae and our results also revealed that Eremomyces langeronii and A. kalrae, traditionally considered the sexual and asexual morphs of the same species, are not conspecific.

No MeSH data available.