@ARTICLE{TreeBASE2Ref19475, author = {Young-Joon Choi and Marco Thines and Hyeon-Dong Shin}, title = {A new perspective on the evolution of white blister rusts: Albugo s.str. (Albuginales; Oomycota) is not restricted to Brassicales but also present on Fabales}, year = {2011}, keywords = {acient DNA; cox2 mtDNA; host jumping; pathogen evolution; unusual hosts}, doi = {}, url = {http://}, pmid = {}, journal = {Organisms Diversity and Evolution}, volume = {}, number = {}, pages = {}, abstract = {For almost all groups of pathogens, unusual hosts with rare species have been reported. Often, these reports are known only from a single or few collections, which are often hard to access. In many cases, these reports are due to a misidentification of host, pathogen, or both. Therefore, they are often disregarded, or treated anecdotal in taxonomic and phylogenetic studies, regardless of potential importance to unravel the evolution of the whole group. In oomycete pathogens there are several reports of unusual and rare hosts for hardly known species. For example, from the order Fabales, only a single species of Albugo, Albugo mauginii, was described to be parasitic to Onobrychis crista-galii about 80 years ago. However, this species has not been recorded afterwards. All confirmed members of Albugo s.str. are parasitic to the families Brassicaceae, Capparaceae, Cleomaceae, and Resedaceae of the Brassicales. Molecular phylogenetic analysis of cox2 mtDNA sequences and morphological investigations on an original specimen confirmed the occurrence of a member of Albugo on the Fabaceae, with the characteristic thin wall of the secondary sporangia, which is almost uniform in thickness. Also in phylogenetic analyses the species is embedded within Albugo s.str. Therefore, it is concluded that natural host range of Albugo s.str. extends from Brassicales to the Fabales by host jumping. Our results underscore that unascertained reports of pathogens on unusual hosts should be carefully reconsidered to obtain a more complete picture of pathogen diversity and evolution, which might undergo significant changes if these records are correct.} }

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