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ARS Home » Midwest Area » Peoria, Illinios » National Center for Agricultural Utilization Research » Mycotoxin Prevention and Applied Microbiology Research » Research » Publications at this Location » Publication #225336

Title: Molecular phylogeny and taxonomy of the genus Hamigera

item Peterson, Stephen - Steve

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 8/9/2008
Publication Date: 8/9/2008
Citation: Peterson, S.W. 2008. Molecular phylogeny and taxonomy of the genus Hamigera. Meeting Abstract.

Interpretive Summary:

Technical Abstract: The genus Hamigera Stolk & Samson was created for the single species H. striata, a species previously placed in the genus Talaromyces (Stolk and Samson, 1971). Hamigera species, that produce ampulliform phialides and (sub) spherical conidia, differ from Talaromyces species and anamorphic species in Penicillium subgenus Biverticillium that produce acerose phialides and the conidia tend to be ovoid-elongate. Hamigera avellanea was later added to the genus because of these characters. DNA sequences from beta tubulin, calmodulin, ITS, lsu-rDNA and RNA polymerase beta were determined for ca. 50 Hamigera species isolates and analyzed phylogenetically using concordance theory to determine the boundaries of species. Among the H. avellanea-like isolates, four distinct lineages were detected and these are being described as species. The six H. striata isolates examined formed a single species. Penicillium megasporum has an unusual penicillus that resembles that of Merimbla and P. megasporum is phylogenetically part of the Hamigera clade. The broad species concepts currently in use for H. avellanea and H. striata do not adequately reflect the biodiversity in the genus and are revised to reflect the results of concordance analysis.