New species and records of Coryneum from China

Ning Jiang,Hermann Voglmayr,Chengming Tian

doi:10.1080/00275514.2018.1516969

Ning Jiang, Hermann Voglmayr + Show 1 more

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https://doi.org/10.1080/00275514.2018.1516969

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Journal: Mycologia	Publication Date: Nov 2, 2018
Citations: 12	License type: open-access

Affiliation: Beijing Forestry University, University of Vienna

Abstract

ABSTRACTFollowing the abandonment of dual nomenclature and the implementation of single-name nomenclature for pleomorphic fungi, Coryneum was considered to have priority over Pseudovalsa and was recommended for use. Currently, Coryneum is the only genus in the family Coryneaceae (Diaporthales). However, DNA sequence data are lacking for most Coryneum species, and no detailed phylogenetic analyses of the genus are yet available. In the present study, fresh Coryneum samples were collected from chestnut (Castanea) and oak (Quercus) trees in China and morphologically compared with accepted Coryneum species. Based on morphological characteristics, they were identified as one known species, Coryneum castaneicola, and three novel species described here as C. gigasporum, C. sinense, and C. suttonii. Conidial dimensions and host association were considered major characters for species distinction. The previously unknown sexual morph of C. castaneicola is reported and described. A phylogenetic analysis of nuc rDNA internal transcribed spacer (ITS1-5.8S-ITS2 = ITS) and large subunit (28S) sequence data of a representative matrix of Diaporthales confirmed Coryneaceae to represent a monophyletic clade. A phylogenetic analysis of a combined sequence matrix containing the ITS-28S rDNA, the translation elongation factor 1-α (TEF1α), and the second largest subunit of the RNA polymerase II (RPB2) of the four Chinese and four additional European Coryneum species was performed, confirming the distinctness of these novel species.

Highlights

Diaporthales is a diverse fungal order inhabiting plant and animal tissues, with most members being pathogens, saprobes, or endophytes (Barr 1978; Rossman et al 2007; Senanayake et al 2017)
Coryneum was first described based on C. umbonatum (Nees von Esenbeck 1816), which is the asexual morph of Pseudovalsa longipes (Sutton 1975)
Isolates of Coryneum species from this study and previous studies grouped together in a distinct Coryneaceae clade within Diaporthales, which is separate from all other families and receives high support (ML/Maximum parsimony (MP)/Bayesian inference (BI) = 92/93/1)

Summary

Introduction

Diaporthales is a diverse fungal order inhabiting plant and animal tissues, with most members being pathogens, saprobes, or endophytes (Barr 1978; Rossman et al 2007; Senanayake et al 2017). Recent molecular phylogenetic analyses of Diaporthales showed that Coryneaceae represents a monophyletic family among Diaporthales (Voglmayr and Jaklitsch 2014; Senanayake et al 2017; Voglmayr et al 2017; Fan et al 2018), including only the single genus Coryneum. Coryneum was first described based on C. umbonatum (Nees von Esenbeck 1816), which is the asexual morph of Pseudovalsa longipes (Sutton 1975). Based on priority and the need for fewer new combinations, Rossman et al (2015) recommended the genus name Coryneum for use rather than Pseudovalsa. At the family level, the older name Coryneaceae has priority over Pseudovalsaceae (Senanayake et al 2017)

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