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• W2800515477 abstract "HomePlant DiseaseVol. 102, No. 10First Report of Poplar Leaf Rust Caused by Melampsora medusae on Populus mexicana in the United States PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Poplar Leaf Rust Caused by Melampsora medusae on Populus mexicana in the United StatesA. L. Loyd and J. A. SmithA. L. Loyd†Corresponding author: A. L. Loyd; E-mail: E-mail Address: aloyd@bartlett.comhttp://orcid.org/0000-0002-6463-2635Search for more papers by this author and J. A. SmithSearch for more papers by this authorAffiliationsAuthors and Affiliations A. L. Loyd † J. A. Smith , University of Florida, School of Forest Resources and Conservation, Gainesville. Published Online:31 Jul 2018https://doi.org/10.1094/PDIS-03-18-0416-PDNAboutSections ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat In December 2017, rust-colored leaf spots were observed on cultivated Populus mexicana ssp. dimorpha (Brandegee) J.E.Eckenwalder in Gainesville, FL (29°38′16.5″N, 82°21′26.9″W). P. mexicana is monotypic in the section Abaso of the genus Populus and is regarded as being evolutionarily the most primitive species in the genus. This species, native to Mexico, is rapid growing in warm-climate regions such as Arizona and Florida and offers promise for bioenergy feedstock use in these regions. Disease symptoms began in late summer and progressed from chlorotic leaf spots to necrotic leaf spots; pustules formed, followed by early defoliation. Microscopic evaluation of the abaxial side of 20 randomly selected symptomatic leaves revealed pustules typical of uredinia produced by Melampsora species. Urediniospores were observed under 100× on a Nikon Eclipse 55i light microscope (Melville, NY), photographed with a Canon Rebel T3i (Huntington, NY), and measured using the open access program ImageJ (http://imagej.net/). The urediniospores were echinulated throughout except for a smooth patch near the equator of the spore. Urediniospores were typical of Melampsora medusae, were oval to obovoid or pyriform, and measured 30.5 (28.9 to 31.0) × 19.6 (16.2 to 21.9) μm, which was similar to previous measurements (Spiers and Hopcroft 1994). Similarly, clavate to capitate paraphyses were observed in pustules and measured 31.2 to 54.9 μm in length and clavate to capitate apex breadth of 11.7 to 16.8 μm. Leaf samples have been preserved and deposited into the University of Florida Mycological Herbarium under the accession number FLAS-F-62045. DNA was extracted with the Sigma Extract-N-Amp method (Sigma-Aldrich, St. Louis, MO) from urediniospores, which were scraped from pustules with a sterile dissecting needle, and PCR amplification of the internal transcribed spacer (ITS) region was carried out with primers ITS1F and ITS4b as previously described (Gardes and Bruns 1993). Amplicons were purified with ExoSap-IT (Applied Biosystems, Foster City, CA), sequenced with both primers using Sanger sequencing, assembled and visually edited, and deposited to GenBank (accession no. MG838582). The ITS sequence had 100% homology with other M. medusae sequences deposited to GenBank (GQ479928, GQ479918, and GQ479909). Based on morphology and ITS sequence alone, we could not determine whether our sample was M. medusae f. sp. deltoidae or M. medusae f. sp. tremuloidae, but it is likely that it is M. medusae f. sp. deltoidae given that Populus deltoides is native to Florida. This is the first report of M. medusae on P. mexicana in the United States; although it has been reported on this host in Mexico (Hennen and McCain 1993), the host subspecies was not reported. Given the evolutionary position of this host, it may be interesting to study this host-pathogen interaction to unravel the rust pathosystem in Populus. Because Melampsora rust is considered one of the most yield-limiting diseases in poplar plantations globally, knowledge about the evolutionary basis of the interaction would be of value for breeding. In addition, this host has high bioenergy potential; thus, resistance must be developed using genes (through hybridization) from P. deltoides or perhaps within P. mexicana, if they exist.References:Gardes, M., and Bruns, T. D. 1993. Mol. Ecol. 2:113. https://doi.org/10.1111/j.1365-294X.1993.tb00005.x Crossref, ISI, Google ScholarHennen, J. F., and McCain, J. W. 1993. Mycologia 85:970. https://doi.org/10.2307/3760681 Crossref, ISI, Google ScholarSpiers, A., and Hopcroft, D. 1994. Mycol. Res. 98:889. https://doi.org/10.1016/S0953-7562(09)80260-8 Crossref, ISI, Google ScholarDetailsFiguresLiterature CitedRelated Vol. 102, No. 10 October 2018SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 28 Sep 2018Published: 31 Jul 2018First Look: 16 Apr 2018Accepted: 13 Apr 2018 Pages: 2033-2033 Information© 2018 The American Phytopathological SocietyCited byMelampsora medusae (poplar leaf rust)CABI Compendium, Vol. CABI CompendiumIsolation of Trichoderma from forestry model base and the antifungal properties of isolate TpsT17 toward Fusarium oxysporumMicrobiological Research, Vol. 231" @default.
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