Cercospora: a weedy patch in the garden?

J.Z. Groenewald, C. Nakashima, H.D. Shin, U. Braun, P.W. Crous

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

The genus Cercospora contains numerous important plant pathogenic fungi from a diverse range of plant hosts. Many Cercospora species are known only from their morphological characters in vivo and not from their morphology in vitro. Cercospora encompasses more than 5 000 names, but very few of these are available in culture and associated DNA sequence data are rarely provided. In our study, we subjected 360 Cercospora strains, obtained from 161 host species, 49 host families and 39 countries, to a molecular phylogeny approach. Partial sequences were derived from five genomic loci, namely the internal transcribed spacer regions and intervening 5.8S nrRNA gene, and partial actin, calmodulin, histone H3 and translation elongation factor 1-alpha genes. The resulting phylogenetic clades were evaluated for application of existing species names and, in addition, five novel species were introduced. In order to stabilize their species circumscription, 11 species were epi-, lecto- or neotypified. Several clades were found for which existing candidate species names were available; however, it was not always possible to apply North American or European names to African or Asian strains and vice versa. We did not identify a single locus to be the ideal DNA barcode gene for the genus, and recommend that species should be identified based on a combination of DNA and morphological characters. In the course of this study, it became evident that several important phytopathogenic Cercospora species require taxonomic revision. Fresh collections are required from the original hosts in the countries of origin, however, to facilitate these studies.
Original languageEnglish
Title of host publicationBook of Abstracts 10th International Congress of Plant Pathology, Beijing, China, 25-30 August 2013
Pages542-543
Volume43(suppl.)
Publication statusPublished - 2013
Event10th International Congress of Plant Pathology: Bio-security, food safety and plant pathology, 25-30 August 2013, Beijing, China -
Duration: 25 Aug 201330 Aug 2013

Conference

Conference10th International Congress of Plant Pathology: Bio-security, food safety and plant pathology, 25-30 August 2013, Beijing, China
Period25/08/1330/08/13

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