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- Title
Resistance to <italic>Sclerotinia sclerotiorum</italic> in wild <italic>Brassica</italic> species and the importance of <italic>Sclerotinia subarctica</italic> as a <italic>Brassica</italic> pathogen.
- Authors
Taylor, A.; Handy, C.; Clarkson, J. P.; Rana, K.
- Abstract
<italic>Brassica</italic> crops are of global importance, with oilseed rape (<italic>Brassica napus</italic>) accounting for 13% of edible oil production. All <italic>Brassica</italic> species are susceptible to sclerotinia stem rot caused by <italic>Sclerotinia sclerotiorum</italic>, a generalist fungal pathogen causing disease in over 400 plant species. Generally, sources of plant resistance result in partial control of the pathogen although some studies have identified wild <italic>Brassica</italic> species that are highly resistant. The related pathogen <italic>S</italic>. <italic>subarctica</italic> has also been reported on <italic>Brassica</italic> but its aggressiveness in relation to <italic>S. sclerotiorum</italic> is unknown. In this study, detached leaf and petiole assays were used to identify new sources of resistance to <italic>S</italic>. <italic>sclerotiorum</italic> within a wild <italic>Brassica</italic> ‘C genome’ diversity set. High‐level resistance was observed in <italic>B. incana</italic> and <italic>B. cretica</italic> in petiole assays, whilst wild <italic>B. oleracea</italic> and <italic>B. incana</italic> lines were the most resistant in leaf assays. A <italic>B. bourgeai</italic> line showed both partial petiole and leaf resistance. Although there was no correlation between the two assays, resistance in the detached petiole assay was correlated with stem resistance in mature plants. When tested on commercial cultivars of <italic>B. napus</italic>,<italic> B. oleracea</italic> and <italic>B. rapa</italic>, selected isolates of <italic>S</italic>. <italic>subarctica</italic> exhibited aggressiveness comparable to <italic>S</italic>. <italic>sclerotiorum</italic> indicating it can be a significant pathogen of <italic>Brassica</italic>. This is the first study to identify <italic>B. cretica</italic> as a source of resistance to <italic>S. sclerotiorum</italic> and to report resistance in other wild <italic>Brassica</italic> species to a UK isolate, hence providing resources for breeding of resistant cultivars suitable for Europe.
- Subjects
BRASSICA varieties; DISEASE resistance of plants; SCLEROTINIA sclerotiorum; RUTABAGA; PATHOGENIC microorganisms
- Publication
Plant Pathology, 2018, Vol 67, Issue 2, p433
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/ppa.12745