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dc.creatorRojas, Jorge Alejandro
dc.creatorJacobs, Janette L.
dc.creatorNapieralski, Stephanie
dc.creatorKaraj, Behirda
dc.creatorBradley, Carl Alan
dc.creatorChase, Thomas
dc.creatorEsker, Paul D.
dc.creatorGiesler, Loren J.
dc.creatorJardine, Doug J.
dc.creatorMalvick, Dean K.
dc.creatorMarkell, Samuel G.
dc.creatorNelson, Berlin D.
dc.creatorRobertson, Alison E.
dc.creatorRupe, John C.
dc.creatorSmith, Damon L.
dc.creatorSweets, Laura E.
dc.creatorTenuta, Albert U.
dc.creatorWise, Kiersten Alane
dc.creatorChilvers, Martin I.
dc.date.accessioned2019-09-25T19:30:42Z
dc.date.available2019-09-25T19:30:42Z
dc.date.issued2017
dc.identifier.issn0031-949X
dc.identifier.issn1943-7684
dc.identifier.urihttp://hdl.handle.net/10669/79164
dc.description.abstractOomycete pathogens are commonly associated with soybean root rot and have been estimated to reduce soybean yields in the United States by 1.5 million tons on an annual basis. Limited information exists regarding the frequency and diversity of oomycete species across the major soybean-producing regions in North America. A survey was conducted across 11 major soybean-producing states in the United States and the province of Ontario, Canada. In 2011, 2,378 oomycete cultures were isolated from soybean seedling roots on a semiselective medium (CMA-PARPB) and were identified by sequencing of the internal transcribed spacer region of rDNA. Sequence results distinguished a total of 51 Pythium spp., three Phytophthora spp., three Phytopythium spp., and one Aphanomyces sp. in 2011, with Pythium sylvaticum (16%) and P. oopapillum (13%) being the most prevalent. In 2012, the survey was repeated, but, due to drought conditions across the sampling area, fewer total isolates (n = 1,038) were collected. Additionally, in 2012, a second semiselective medium (V8-RPBH) was included, which increased the Phytophthora spp. isolated from 0.7 to 7% of the total isolates. In 2012, 54 Pythium spp., seven Phytophthora spp., six Phytopythium spp., and one Pythiogeton sp. were recovered, with P. sylvaticum (14%) and P. heterothallicum (12%) being recovered most frequently. Pathogenicity and virulence were evaluated with representative isolates of each of the 84 species on soybean cv. Sloan. A seed-rot assay identified 13 and 11 pathogenic species, respectively, at 13 and 20°C. A seedling-root assay conducted at 20°C identified 43 species as pathogenic, having a significantly detrimental effect on the seedling roots as compared with the noninoculated control. A total of 15 species were pathogenic in both the seed and seedling assays. This study provides a comprehensive characterization of oomycete species present in soybean seedling roots in the major production areas in the United States and Ontario, Canada and provides a basis for disease management and breeding programs.es_ES
dc.description.sponsorshipNational Institute of Food and Agriculture/[2011-68004-30104]/USDA/Estados Unidoses_ES
dc.description.sponsorshipNational Institute of Food and Agriculture/[#GR11-081]/USDA/Estados Unidoses_ES
dc.description.sponsorshipUnited Soybean Board/[]/USB/Estados Unidoses_ES
dc.description.sponsorshipNorth Central Soybean Research Program/[]/NCSRP/Estados Unidoses_ES
dc.description.sponsorshipGrain Farmers of Ontario/[]//Cánadaes_ES
dc.language.isoen_USes_ES
dc.sourcePhytopathology, vol.107(3), pp.280-292es_ES
dc.subjectOomycete specieses_ES
dc.subjectSoybean seedlingses_ES
dc.subjectNorth Americaes_ES
dc.titleOomycete Species Associated with Soybean Seedlings in North America—Part I: Identification and Pathogenicity Characterizationes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.identifier.doi10.1094/PHYTO-04-16-0177-R
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Agroalimentarias::Centro para Investigaciones en Granos y Semillas (CIGRAS)es_ES


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