The sections of Alternaria: formalizing species-group concepts

  title={The sections of Alternaria: formalizing species-group concepts},
  author={Daniel P. Lawrence and Philipp B. Gannibal and Tobin L. Peever and Barry M. Pryor},
  pages={530 - 546}
The systematics of Alternaria and allied genera traditionally has been based on the characteristics of conidia and the sporulation apparatus. This emphasis on morphology in the reconstruction of organismal relationships has resulted in taxonomic uncertainty and flux for a number of taxa in Alternaria and the related genera Stemphylium, Embellisia, Nimbya and Ulocladium. The present study used a molecular phylogenetic approach for systematic resolution and incorporated extensive taxon sampling… 

Contrasting species boundaries between sections Alternaria and Porri of the genus Alternaria

The fungal genus Alternaria comprises a large number of asexual taxa with diverse ecological, morphological and biological modes ranging from saprophytes to plant pathogens, and significant association with host specifity seems a driving force for speciation.

Contrasting species boundaries between sections Alternaria and Porri of the genus Alternaria

The fungal genus Alternaria comprises a large number of asexual taxa with diverse ecological, morphological and biological modes ranging from saprophytes to plant pathogens, and association with host specificity seems a driving force for speciation.

Alternaria redefined

The aim of this study was to delineate phylogenetic lineages within Alternaria and allied genera based on nucleotide sequence data of parts of the 18S nrDNA, 28S nRDNA, ITS, GAPDH, RPB2 and TEF1-alpha gene regions, and reveal a Pleospora/Stemphylium clade sister to Embellisia annulata, and a well-supported Alternaria clade.

Additions to the Inventory of the Genus Alternaria Section Alternaria (Pleosporaceae, Pleosporales) in Italy

This research aims to enhance the taxonomy of saprobic species in the genus Alternaria found on grasses and herbaceous plants from Italy, based on multi-locus phylogenetic analyses of a concatenated ITS, LSU, SSU, tef1-α, rpb2, gapdh and Alt-a1 DNA sequence dataset combined with morphological characteristics.

Alternaria section Alternaria: Species, formae speciales or pathotypes?

New Species of Large-Spored Alternaria in Section Porri Associated with Compositae Plants in China

Multi-locus sequence analyses encompassing the internal transcribed spacer region of rDNA, glyceraldehydes-3-phosphate dehydrogenase, Alternaria major allergen gene, translation elongation factor 1-alpha (TEF1), and RNA polymerase second largest subunit (RPB2), revealed that the new species fell into sect.

Genomics evolutionary history and diagnostics of the Alternaria alternata species group including apple and Asian pear pathotypes

Mating-type distribution indicated that gene flow has occurred since the formation of A. tenuissima and A. arborescens lineages, and primers designed to AMT14 allow identification and differentiation of apple, pear and strawberry pathotypes, providing new tools for pathogen diagnostics.

Alternaria Genus and the Diseases Caused to Agricultural and Horticultural Plants

This work wants to clarify some of the aspects concerning the old and actual taxonomy ambiguities of Alternaria genus, which is now divided in 28 sections, each section contains species that are genetically related.



Alt a 1 allergen homologs from Alternaria and related taxa: analysis of phylogenetic content and secondary structure.

Nimbya and Embellisia revisited, with nov. comb for Alternaria celosiae and A. perpunctulata

Data reveal that both Nimbya and Embellisia are polyphyletic as currently defined and taxonomic restructuring is necessary in order to resolve conflict between historical morphological and contemporary molecular-based phylogenies.

Molecular phylogenetic relationships amongst Alternaria species and related fungi based upon analysis of nuclear ITS and mt SSU rDNA sequences

Phylogenetic analysis of the ITS and SSU rDNA sequences revealed that the Stemphylium spp.

Molecular characterization of Embellisia and Nimbya species and their relationship to Alternaria, Ulocladium and Stemphylium

DNA sequences from rDNA and protein-coding regions were determined and revealed that Embellisia and Nimbya clustered within a large monophyletic Alternaria-Nimbya-Embellisian-Ulocladium clade with Stemphylium as the sister taxon.

An expanded multilocus phylogeny does not resolve morphological species within the small-spored Alternaria species complex

Although 5–9 well supported clades were evident among isolates, it is currently unclear if these clades should be considered phylogenetic species or emerging evolutionary line-ages within the phylogenetically defined alternata species-group.

Molecular systematics of citrus-associated Alternaria species

The causal agents of Alternaria brown spot of tangerines and tangerine hybrids, Alternaria leaf spot of rough lemon and Alternaria black rot of citrus historically have been referred to as Alternaria citri or A. alternata, and the number of morphospecies associated with citrus exceeded that which could be supported under a phylogenetic species concept, and isolates in five of nine phylogenetic lineages consistently were correlated with a specific host, disease or ecological niche on citrus.

Taxonomy of Fusarium genus: A continuous fight between lumpers and splitters

The genus Fusarium comprises a high number of fungal species that can be plant-pathogenic, causing diseases in several agriculturally important crops including cereals, and also can be harmful for

Typification of Alternaria, Stemphylium, and Ulocladium.

The present purpose is to illustrate and to contrast the type specimens of Alternaria, Stemphylium, and Ulocladium Preuss, the latter being an early but generally disregarded generic name appropriate to several pseudoalternarioid and pseudostEMphylioid species.

Phylogenetic analysis of Xylaria based on nuclear ribosomal ITS1-5. 8S-ITS2 sequences.

The stromal structure, ascal apex, ectostromal surface, perithecial structure, stipe differentiation and the germ slit of ascospores were phylogenetically significant characters in grouping Xylaria.