Multigene phylogenetic analyses of the Thelonectria coronata and T. veuillotiana species complexes.
Thelonectria is a recently established genus of common and ubiquitous fungi on woody hosts, previously placed in the genus Neonectria. Thelonectria coronata and T. veuillotiana occur sympatrically in tropical, subtropical and temperate regions. Previous taxonomic studies including T. coronata and T. veuillotiana suggested these fungi could represent species complexes; however, the morphological features used to define species exhibited few differences useful for testing this hypothesis. To assess the status of T. coronata and T. veuillotiana, phylogenetic analyses of six genomic regions were combined with a morphological examination of specimens. A multi-gene phylogeny reconstructed with maximum parsimony, maximum likelihood and Bayesian approaches identified five phylogenetic groups in T. coronata and six in T. veuillotiana. As is common for cryptic species, unequivocal diagnostic morphological characters could not be identified; however, average values of morphological traits correspond to the phylogenetic groups. An increased number of non-synonymous/synonymous substitutions in the β-tubu-lin gene and a decreased or absent production of conidia were detected within the T. coronata complex, possibly indicating the homothallic nature of these isolates. T. coronata and T. veuillotiana and related species are described and illustrated here; a dichotomous key to all species is provided.
University of Maryland, Department of Plant Science and Landscape Architecture, College Park, MD 20742, USA. salgadoc@umd.edu
Catalina
C
Salgado-Salazar
Amy
A
Rossman
Gary J
GJ
Samuels
Mariana
M
Capdet
Priscila
P
Chaverri
D000199:Actins / Q000235:genetics; D001203:Ascomycota / Q000145:classification* / Q000166:cytology / Q000235:genetics / Q000302:isolation & purification; D001483:Base Sequence; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D058885:Multilocus Sequence Typing; D016533:Mycological Typing Techniques; D010441:Peptide Chain Elongation, Translational / Q000235:genetics; D010802:Phylogeny; D012319:RNA Polymerase II / Q000235:genetics; D017422:Sequence Analysis, DNA; D013172:Spores, Fungal / Q000145:classification / Q000166:cytology / Q000235:genetics / Q000302:isolation & purification; D014404:Tubulin / Q000235:genetics
D000199:Actins; D004271:DNA, Fungal; D004275:DNA, Ribosomal; D021903:DNA, Ribosomal Spacer; D005656:Fungal Proteins; D014404:Tubulin; D012319:RNA Polymerase II