First Report of Uromyces rumicis on Rumex crispus in Canada

HomePlant DiseaseVol. 107, No. 1First Report of Uromyces rumicis on Rumex crispus in Canada PreviousNext DISEASE NOTE OPENOpen Access licenseFirst Report of Uromyces rumicis on Rumex crispus in CanadaMehrdad Abbasi, Mary Catherine Aime, Bharat Yadav, and Gurcharn Singh BrarMehrdad Abbasi†Corresponding author: M. Abbasi; E-mail Address: [email protected]https://orcid.org/0000-0002-1084-7542Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada, Mary Catherine AimeDepartment of Botany and Plant Pathology, Purdue University, West Lafayette, IN, U.S.A., Bharat YadavFaculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada, and Gurcharn Singh Brarhttps://orcid.org/0000-0002-1429-2716Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, CanadaAffiliationsAuthors and Affiliations Mehrdad Abbasi1 † Mary Catherine Aime2 Bharat Yadav3 Gurcharn Singh Brar3 1Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada 2Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, U.S.A. 3Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada Published Online:10 Jan 2023https://doi.org/10.1094/PDIS-04-22-0846-PDNAboutSectionsPDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Rumex crispus L. (curled dock) is a noxious weed in both grasslands (mainly pastures) and arable lands but is also an early colonizer of many disturbed areas in lowland and upland regions. R. crispus is of agricultural significance because it competes with sown or native pasture and crop species and occupies areas that could be utilized by more palatable crop species. R. crispus can grow on almost all soil types but occurs less often on peat and acidic soils. The range of altitude to which the species has become adapted varies from sea level to 3,500 m (Zaller 2004). This plant species has Eurasian origin and is widely distributed through temperate regions of North America as an introduced species. There is no previous rust report on R. crispus in Canada. On other Rumex species two Puccinia species, Puccinia acetosae (Schumach.) Körn. and P. ornata Arthur & Holw., have been previously reported from Canada (Farr and Rossman 2022). During a recent field survey in Langley, in southern British Columbia, heavily rust-infected leaves of R. crispus were observed. Uredinia and telia were present on both sides of the leaf, mainly on the lower side. Uredinia were early exposed, brown, and pulverulent. Urediniospores were obovoid, ellipsoid or oblong, measuring 20 to 28 × 17 to 23 µm. Urediniospore walls were yellowish brown to brown, 1.5 to 2 µm thick; covered in evenly distributed echinulae, spaced 2 to 3 μm apart, with smooth (nonechinulate) patches at the equator of the urediniospores. Urediniospores with two to three (mostly three and less often two) germ pores, usually supraequatorial (at the upper part of the spore) or distributed irregularly (scattered), or two germ pores supraequatorial, one equatorial or all germ pores equatorial, germ pores covered with flat papilla. Telia similar to the uredinia, dark brown. Teliospores more or less globoid, ellipsoid, broadly ellipsoid, obovoid, or oblong, 25 to 36 × 15 to 23 µm, wall brownish yellow to brown, smooth, 2 to 3 µm thick, with apical or sub-apical germ pore, covered with a hemispherical, yellowish papilla, pedicels colorless, short. The above-mentioned characters fit Majewski's (1977) description for Uromyces rumicis (Schumach.) G. Winter. To confirm identity, the first 903 bp of the 5′ end of the 28S rDNA of the above specimen was amplified following protocols of Aime (2006) and Aime et al. (2018) (GenBank accession no. ON166844). BLAST queries of the sequence shared 99.56% identity (900/903) with U. rumicis (GenBank accession no. KY764197). To our knowledge this is the first report of U. rumicis from Canada (Farr and Rossman 2022). There is only one previous published report of this rust species in North America, made by French (1989), who reported U. rumicis on R. crispus from California. U. rumicis is quite common on Rumex species including R. crispus in Eurasia and has also been reported on this host from Africa (Farr and Rossman 2022). It appears that the above rust fungus species may have been introduced to the North America by accompanying its host plant. A voucher specimen of infected R. crispus with U. rumicis was deposited at Arthur Fungarium (PUR) under the accession number PUR N24014. U. rumicis is a heteromacrocyclic rust with an aecial state on Ranunculus ficaria L. (Ranunculaceae), another introduced plant in North America. However, there is no report of the aecial state of this rust on R. ficaria in North America to date (Farr and Rossman 2022). Because there are only two reports of U. rumicis, in California and British Columbia, it is likely that U. rumicis became established in the West Coast of North America probably no earlier than the second half of the 20th century.The author(s) declare no conflict of interest.References:Aime, M. C. 2006. Mycoscience 47:112. https://doi.org/10.1007/s10267-006-0281-0 Crossref, Google ScholarAime, M. C., et al. 2018. Stud. Mycol. 89:144. Crossref, Google ScholarFarr, D. F., and Rossman, A. Y. 2022. Fungal Databases, Syst. Mycol. Microbiol. Lab., USDA-ARS. Retrieved 3 April 2022 from https://nt.ars-grin.gov/fungaldatabases/ Google ScholarFrench, A. M. 1989. Page 394 in: California Plant Disease Host Index. California Department of Food & Agriculture, Sacramento, CA. Google ScholarMajewski, T. 1977. Flora polska. Grzyby (Mycota). 9: Uredinales I. PWN, Warszawa-Kraków. Google ScholarZaller, J. G. 2004. Weed Res. 44:414. https://doi.org/10.1111/j.1365-3180.2004.00416.x Crossref, ISI, Google ScholarFunding: Funding was provided by The Saskatchewan Wheat Development Commission.The author(s) declare no conflict of interest.DetailsFiguresLiterature CitedRelated Vol. 107, No. 1 January 2023SubscribeISSN:0191-2917e-ISSN:1943-7692 Download Metrics Article History Issue Date: 1 Feb 2023 Published: 10 Jan 2023 First Look: 31 May 2022 Accepted: 23 May 2022 Page: 224 Information© 2023 The American Phytopathological SocietyFundingThe Saskatchewan Wheat Development CommissionKeywordsfungal diseasePolygonaceaeRumexrust fungiThe author(s) declare no conflict of interest.PDF download