Journal
AMERICAN JOURNAL OF BOTANY
Volume 96, Issue 7, Pages 1281-1288Publisher
BOTANICAL SOC AMER INC
DOI: 10.3732/ajb.0900010
Keywords
Atradidymella muscivora; bryophilous; pathogenesis; stroma development; Phoma herbarum; Pleosporales
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Graduate Scholarship (CGS)
- NSERC-CGS
- Alberta Ingenuity Fund (AIF) Incentive Award
- Alberta Conservation Association (ACA)
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During a survey of bryophilous fungi from boreal and montane habitats, 12 isolates of a hitherto unknown plant pathogenic member of the Pleosporales were recovered from Aulacomnium palustre, Hylocomium splendens, and Polytrichum juniperinum, and described as Atradidymella muscivora gen. et sp. nov. Atradidymella is characterized by minute, unilocular, setose pseudothecia having 2-3 wall layers; brown, fusiform, I-septate ascospores; and a Phoma anamorph. The genus is distinguished from all other pleosporalean genera with brown, fusiform ascospores oil the basis of ascospore and pseudothecium morphology and a highly reduced stroma that is localized within a single host cell. Atradidymella muscivora is distinguished by its minute pseudothecia (<115 mu m) and ascospores that are slightly allantoid and constricted at the septum with the upper cell often wider than the lower. Its anamorph, Phoma muscivora sp. nov., is morphologically distinguishable from P. herbarum in having smaller conidia, Parsimony analysis of the ITS rDNA region indicates A. muscivora has affinities to the Phoma-Ascochyta-Didymella clade that is sister to the Phaeosphaeriaceae within the Pleosporales.
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