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Screening Cotoneaster for Resistance to Fire Blight by Artificial Inoculation Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/1z40kv748

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Society for Horticultural Science and can be found at:  http://hortsci.ashspublications.org/

This study is from a thesis submitted by J.J.R. as partial fulfillment of the degree of M.S.

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  • Cotoneaster is a genus of ornamental landscape plants commonly affected by fire blight. Fire blight is a disease caused by the bacterial pathogen, Erwinia amylovora (Burrill) Winslow et al. that attacks a wide range of taxa in the apple subfamily (Maloideae; Rosaceae). To assess susceptibility of species and identify potential sources of resistance, we inoculated 52 taxa of Cotoneaster with E. amylovora. Disease severity was scored by percent shoot necrosis (lesion length/ total shoot length). Disease screenings were conducted over two years and varying levels of susceptibility were observed. Some taxa were highly susceptible to fire blight and the disease resulted in whole plant mortality (C. rhytidophyllus Rehder & E.H. Wilson, C. rugosus E. Pritzel ex Diels, and C. wardii W.W. Smith). Other taxa repeatedly exhibited moderate to high levels of disease resistance (C. arbusculus G. Klotz, C. chungtinensis (T.T. Yu) J. Fryer & B. Hylmö, C. delsianus E. Pritzel var. delsianus, C. sikangensis Flinck & B. Hylmö, C. simonsii Baker, and C. splendens Flinck & Hylmö). Ongoing studies are being conducted to determine if taxa with high levels of resistance under artificial inoculation will exhibit high levels of resistance in the field under natural disease pressure. Identifying sources of disease resistance will be useful for breeding programs to increase tolerance of these landscape plants with desirable horticultural characteristics to fire blight.
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  • Rothleutner, J. J., Contreras, R. N., Stockwell, V. O., & Owen, J. S. (2014). Screening Cotoneaster for Resistance to Fire Blight by Artificial Inoculation. HortScience, 49(12), 1480-1485.
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  • This research was funded, in part, by the Oregon Agricultural Experiment Station and by USDA-ARS Specific Cooperative Agreement 58-1230-3-501.
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  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2015-06-08T22:38:37Z (GMT) No. of bitstreams: 1 ContrerasRyanHorticultureScreeningCotoneasterForResistanceToFireBlight.pdf: 327344 bytes, checksum: 16ff90e2d985869599a65bbf81b9773a (MD5)
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2015-06-08T22:37:48Z No. of bitstreams: 1 ContrerasRyanHorticultureScreeningCotoneasterForResistanceToFireBlight.pdf: 327344 bytes, checksum: 16ff90e2d985869599a65bbf81b9773a (MD5)

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