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Pathotypic diversity of Hyaloperonospora brassicae collected from Brassica oleracea
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Coelho, Paula S., Vicente, Joana G., Monteiro, António A. and Holub, E. B. (2012) Pathotypic diversity of Hyaloperonospora brassicae collected from Brassica oleracea. European Journal of Plant Pathology, Vol.134 (No.4). pp. 763-771. doi:10.1007/s10658-012-0052-z
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WRAP_Vicente_Pathotype diversity of Boleracea DM EJPP_Coelho et al July 2012.pdf - Accepted Version Download (447Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/s10658-012-0052-z
Abstract
Downy mildew caused by Hyaloperonospora brassicae is an economically destructive disease of brassica crops in many growing regions throughout the world. Specialised pathogenicity of downy mildews from different Brassica species and closely related ornamental or wild relatives has been described from host range studies. Pathotypic variation amongst Hyaloperonospora brassicae isolates from Brassica oleracea has also been described; however, a standard set of B. oleracea lines that could enable reproducible classification of H. brassicae pathotypes was poorly developed. For this purpose, we examined the use of eight genetically refined host lines derived from our previous collaborative work on downy mildew resistance as a differential set to characterise pathotypes in the European population of H. brassicae. Interaction phenotypes for each combination of isolate and host line were assessed following drop inoculation of cotyledons and a spectrum of seven phenotypes was observed based on the level of sporulation on cotyledons and visible host responses. Two host lines were resistant or moderately resistant to the entire collection of isolates, and another was universally susceptible. Five lines showed differential responses to the H. brassicae isolates. A minimum of six pathotypes and five major effect resistance genes are proposed to explain all of the observed interaction phenotypes. The B. oleracea lines from this study can be useful for monitoring pathotype frequencies in H. brassicae populations in the same or other vegetable growing regions, and to assess the potential durability of disease control from different combinations of the predicted downy mildew resistance genes.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | S Agriculture > SB Plant culture | ||||
| Divisions: | Faculty of Science > Life Sciences (2010- ) | ||||
| Library of Congress Subject Headings (LCSH): | Downy mildew diseases -- Pathogenesis, Cole crops -- Diseases and pests, Cole crops -- Genetics | ||||
| Journal or Publication Title: | European Journal of Plant Pathology | ||||
| Publisher: | Springer | ||||
| ISSN: | 0929-1873 | ||||
| Official Date: | December 2012 | ||||
| Dates: |
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| Date of first compliant deposit: | 23 December 2015 | ||||
| Volume: | Vol.134 | ||||
| Number: | No.4 | ||||
| Page Range: | pp. 763-771 | ||||
| DOI: | 10.1007/s10658-012-0052-z | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Fundação para a Ciência e a Tecnologia (FCT), Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA) | ||||
| Grant number: | PTDC/AGR-GPL/70135/2006 (FCT), HH37232SX (DEFRA) |
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