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Lookup NU author(s): Professor Neil Boonham,
Professor Giles Budge
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Real-time PCR (TaqMan®) assays were developed for the specific detection and discrimination of Colletotrichum spp., C. acutatum and C. gloeosporioides causing anthracnose in strawberry using the most divergent area of the internal transcribed spacers (ITS1 and ITS2) and 5.8S ribosomal RNA (rRNA) gene region. The specificity of the new assays was tested using DNA from six species of Colletotrichum and nine fungal species commonly found associated with strawberry material, and additionally by comparing the sequences with those from databases using a blast search. The sequences only showed identity with homologous sequences from the desired target organisms. The new assays were 10-100 times more sensitive than conventional PCR methods previously published for the diagnosis of strawberry anthracnose. When real-time PCR was compared with ELISA methods, PCR improved the sensitivity of the identification by obtaining positive results for samples of strawberry plant material that tested negative with ELISA. The development of C. acutatum was monitored using artificially infected strawberry crowns from two strawberry cultivars (Camarosa and Ventana) and a real-time PCR assay specific for this species between January and June 2006. The amount of C. acutatum detected using real-time PCR varied significantly by month (P < 0.001), but not by cultivar (P = 0.394). The new assays were shown to be useful tools for rapid detection and identification of these pathogens and to allow rapid and accurate assessment of the casual agents of anthracnose in strawberry. © 2008 The Authors.
Author(s): Garrido C, Carbu M, Fernandez-Acero FJ, Boonham N, Colyer A, Cantoral JM, Budge G
Publication type: Article
Publication status: Published
Journal: Plant Pathology
Print publication date: 01/02/2009
Online publication date: 04/08/2008
ISSN (print): 0032-0862
ISSN (electronic): 1365-3059
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