Abstract
Recent phylogenetic analyses of Albugo candida using the mitochondrial cytochrome c oxidase subunit II (cox2) gene, the nuclear ribosomal RNA large subunit (LSU) gene and the nuclear ribosomal RNA internal transcribed spacer (ITS) gene region have revealed significant genetic variation and led to the description of new species in the A. candida complex. This study examined the genetic diversity within Australian collections of A. candida from various Brassicaceae species in a range of geographic locations. Phylogenetic analysis of 31 Australian A. candida collections from 11 hosts using the rDNA ITS region, rDNA LSU region and cox2 mtDNA showed that the majority of Australian A. candida collections were the common form of A. candida. One collection from a common weed host, hairy bitter cress (Cardamine hirsuta), was found to belong to a previously reported but undescribed species, while three collections, also from C. hirsuta, were found to belong to a new undescribed species.
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