Phenotypic and phylogenetic studies associated with the crucifer white leaf spot pathogen, Pseudocercosporella capsellae, in Western Australia

Article


Gunasinghe, N., You, M. P. and Barbetti, M. J.. 2016. "Phenotypic and phylogenetic studies associated with the crucifer white leaf spot pathogen, Pseudocercosporella capsellae, in Western Australia." Plant Pathology. 65 (2), pp. 205-217. https://doi.org/10.1111/ppa.12402
Article Title

Phenotypic and phylogenetic studies associated with the crucifer white leaf spot pathogen, Pseudocercosporella capsellae, in Western Australia

ERA Journal ID2652
Article CategoryArticle
AuthorsGunasinghe, N. (Author), You, M. P. (Author) and Barbetti, M. J. (Author)
Journal TitlePlant Pathology
Journal Citation65 (2), pp. 205-217
Number of Pages13
Year2016
PublisherJohn Wiley & Sons
Place of PublicationUnited Kingdom
ISSN0032-0862
1365-3059
Digital Object Identifier (DOI)https://doi.org/10.1111/ppa.12402
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1111/ppa.12402/abstract
Abstract

Pseudocercosporella capsellae (white leaf spot disease) is an important disease on crucifers. Fifty four single-conidial isolates collected from Brassica juncea (Indian mustard), B. napus (oilseed rape), B. rapa (turnip), and Raphanus raphanistrum (wild radish) across Western Australia were investigated for differences in pathogenicity and virulence using cotyledon screening tests, genetic differences using Internal Transcribed Spacer (ITS) sequencing and phylogenetic analysis, and growth rates on potato dextrose, V8 juice and malt extract agars. All isolates from the four crucifer hosts were pathogenic on the three test species: B. juncea, B. napus and R. raphanistrum, but showed differences in levels of virulence. Overall, isolates from B. juncea, B. napus and B. rapa showed greatest virulence on B. juncea, least on R. raphanistrum and intermediate virulence on B. napus. Isolates from R. raphanistrum showed greatest virulence on B. juncea, least on B. napus and intermediate virulence on R. raphanistrum. Growth and production of a purple-pink pigment indicative of cercosporin was greatest on malt extract agar and cercosporin production on V8 juice agar was positively correlated with virulence of isolates on B. juncea and B. napus. ITS sequencing and phylogenetic analysis showed that isolates collected from B. napus, B. juncea and B. rapa, in general and with few exceptions, had a high degree of genetic similarity. In contrast, isolates from R. raphanistrum were clearly differentiated from isolate groups collected from Brassica hosts. P. capsellae reference isolates from other countries generally grouped into a single separate cluster, highlighting the genetic distinctiveness of Western Australian isolates.

KeywordsPseudocercosporella capsellae, white leaf spot, genetic variation, phenotypic variation
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
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Byline AffiliationsUniversity of Western Australia
Institution of OriginUniversity of Southern Queensland
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