Journal
PERSOONIA
Volume 22, Issue -, Pages 63-74Publisher
RIJKSHERBARIUM
DOI: 10.3767/003158509X430930
Keywords
Ozonium; Pezizales; Phylogeny; Phymatotrichum root rot; Pulchromyces fimicola; RPB2; Texas
Categories
Funding
- USDA-NRI [98-35303-6776]
- NSERC [DG 238464-01]
- Oklahoma Agricultural Experiment Station [2536]
- Oklahoma Department of Agriculture, Food and Forestry
- NSF-EPSCoR
- NSF [DEB-0315940]
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Cotton root rot is an important soilborne disease of cotton and numerous dicot plants in the south-western United States and Mexico. The causal organism, Phymatotrichopsis omnivora (= Phymatotrichum omnivorum), is known only as an asexual, holoanamorphic (mitosporic) fungus, and produces conidia resembling those of Botrytis. Although the corticoid basidiomycetes Phanerochaete omnivora (Polyporales) and Sistotrema brinkmannii (Cantharellales; both Agaricomycetes) have been suggested as teleomorphs of Phymatotrichopsis omnivora, phylogenetic analyses of nuclear small- and large-subunit ribosomal DNA and subunit 2 of RNA polymerase II from multiple isolates indicate that it is neither a basidiomycete nor closely related to other species of Botrytis (Sclerotiniaceae, Leotiomycetes). Phymatotrichopsis omnivora is a member of the family Rhizinaceae, Pezizales (Ascomycota: Pezizomycetes) allied to Psilopezia and Rhizina.
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