Re-evaluating the taxonomic status of Phaeoisariopsis griseola,the causal agent of angular leaf spot of bean |
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| Institution: | 1. Centraalbureau voor Schimmelcultures, Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD, Utrecht, The Netherlands;2. ARC Grain Crops Institute, P. Bag X1251, Potchefstroom 2520, South Africa;3. Martin-Luther-Universität, FB. Biologie, Institut für Geobotanik und Botanischer Garten, Neuwerk 21, D-06099 Halle (Saale), Germany |
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| Abstract: | Angular leaf spot of Phaseolus vulgaris is a serious disease caused by Phaeoisariopsis griseola, in which two major gene pools occur, namely Andean and Middle-American. Sequence analysis of the SSU region of nrDNA revealed the genus Phaeoisariopsis to be indistinguishable from other hyphomycete anamorph genera associated with Mycosphaerella, namely Pseudocercospora and Stigmina. A new combination is therefore proposed in the genus Pseudocercospora, a name to be conserved over Phaeoisariopsis and Stigmina. Further comparisons by means of morphology, cultural characteristics, and DNA sequence analysis of the ITS, calmodulin, and actin gene regions delineated two groups within P. griseola, which are recognised as two formae, namely f. griseola and f. mesoamericana.Taxonomic novelties: Pseudocercospora griseola (Sacc.) Crous & U. Braun comb. nov., P. griseola f. mesoamericana Crous & U. Braun f. nov. |
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| Keywords: | DNA sequence comparisons systematics |
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