Redefining species limits in the Fusarium fujikuroi species complex

Abstract

The Fusarium fujikuroi species complex (FFSC) includes more than 60 phylogenetic species (phylospecies) with both phytopathological and clinical importance. Because of their economical relevance, a stable taxonomy and nomenclature is crucial for species in the FFSC. To attain this goal, we examined type specimens and representative cultures of several species by employing morphology and phylogenetic analyses based on partial gene fragments of the translation elongation factor 1-alpha (tef1), beta-tubulin (tub2), calmodulin (cmdA), RNA polymerase largest subunit (rpb1) and RNA polymerase II second largest subunit (rpb2). Based on these results three new species were delimited in the FFSC. Two of these phylospecies clustered within the African clade, and one in the American clade. Epitypes were also designated for six previously described FFSC species including F. proliferatum and F. verticillioides, and a neotype designated for F. subglutinans. Furthermore, both F. acutatum and F. ophioides, which were previously invalidly published, are validated.

Fusarium: more than a node or a foot-shaped basal cell

“…(2000b) , plus the African B-clade ( Sandoval-Denis et al. 2018b , Yilmaz et al. 2021 ) and a fifth, monotypic clade, which formed the sister clade to the joint American and African B clades and which is here termed African C. The latter clade included two strains showing a clear genealogical and morphological separation from their closest phylogenetic relatives; both came from an unknown tree species in South Africa.…”

“…Notes: Yilmaz et al. (2021) recently revised the FFSC, including formal descriptions for several species, while fixing the typification of relevant plant pathogenic and toxigenic species.…”

“…Epitypus : CBS 222.76 (preserved as metabolically inactive culture), designated by Yilmaz et al. (2021) .…”

“…Lectotypus : Microfungi of the Solomon Islands and Papua-New Guinea: 11, fig 121.2, designated by Yilmaz et al. (2021) .…”

Fusarium casha sp. nov. and F. curculicola sp. nov. in the Fusarium fujikuroi Species Complex Isolated from Amaranthuscruentus and Three Weevil Species in South Africa

“…Such details are also usually not noted for microconidial conidiogenous cells. Species descriptions including such morphology [3,5,7,8,52,53] together with descriptions from this study indicated that a conidiogenous cell morphology can prove diagnostic. For example, they indicated if conidiogenous cells are being formed in sporodochia or singly, whether they are found mingled with those bearing microconidia, whether phialides have different morphologies and the morphology of the conidiophore.…”