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Moparthi S, Grove GG, Pandey B, Bradshaw M, Latham SR, Braun U, Meeboon J, Romberg M. Phylogeny and taxonomy of Podosphaera cerasi, sp. nov., and Podosphaera prunicola sensu lato. Mycologia 2019; 111:647-659. [PMID: 31161891 DOI: 10.1080/00275514.2019.1611316] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Powdery mildew of Prunus spp. is a significant disease in most cherry growing regions of Washington, USA. Powdery mildews on Prunus virginiana and Pr. avium were previously assigned to Podosphaera clandestina s. lat. (= Po. oxyacanthae) or Po. prunicola. In this report, we confirm the presence of two distinct Podosphaera species on these hosts. Phylogenetic analyses of nuc rDNA sequences from the internal transcribed spacer region (ITS1-5.8S-ITS2 = ITS) and 28S subunit confirmed the presence of two distinct species. A morphological comparison with type material of Po. prunicola and additional collections demonstrated that the powdery mildew on Pr. virginiana (including var. demissa and var. melanocarpa) is in fact Po. prunicola. The powdery mildew on Pr. avium is genetically, morphologically, and biologically distinct from Po. prunicola and is described here as the new species Po. cerasi. Cross-inoculation experiments confirmed that these two species are host specific. Podosphaera prunicola was unable to colonize Pr. avium, whereas Po. cerasi was unable to colonize Pr. virginiana. Morphological reexamination of numerous specimens identified as Po. prunicola on a broad range of Prunus species suggests that Po. prunicola is probably confined to species in Prunus subgen.Padus (= Prunus subgen. Cerasus sect. Laurocerasus, including sect. Padus), with Pr. virginiana as the principal host. Podosphaera cerasi occurs on hosts in Prunus subgen. Cerasus, and our work confirms a newly described species of powdery mildew on Pr. avium. This work also includes the first documented and genetically proven European record of Po. prunicola on Pr. serotina and its widespread occurrence in the United States.
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Affiliation(s)
- Swarnalatha Moparthi
- a Irrigated Agriculture Research and Extension Center, Washington State University , Prosser , Washington 99350
| | - Gary G Grove
- a Irrigated Agriculture Research and Extension Center, Washington State University , Prosser , Washington 99350
| | - Binod Pandey
- a Irrigated Agriculture Research and Extension Center, Washington State University , Prosser , Washington 99350
| | - Michael Bradshaw
- b School of Environmental and Forest Sciences, University of Washington , Seattle , Washington 98195
| | - Suzanne Rooney Latham
- c Plant Pest Diagnostics Laboratory, Plant Health and Pest Prevention Services, California Department of Food and Agriculture , 3294 Meadowview Road, Sacramento , California 95832-1448
| | - Uwe Braun
- d Herbarium, Bereich Geobotanik und Botanischer, Institut für Biologie, Martin-Luther-Universität , Neuwerk 21, 06099 Halle (Saale) , Germany
| | - Jamjan Meeboon
- e Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization , Tsu , Mie 514-2392 , Japan.,f Graduate School of Bioresources, Mie University , 1577 Kurima-Machiya, Tsu 514-8507 , Japan
| | - Megan Romberg
- g Mycology and Nematology Genetic Diversity and Biology Laboratory, United States Department of Agriculture , Beltsville , Maryland 20705
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Colony-PCR Is a Rapid Method for DNA Amplification of Hyphomycetes. J Fungi (Basel) 2016; 2:jof2020012. [PMID: 29376929 PMCID: PMC5753074 DOI: 10.3390/jof2020012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 04/14/2016] [Accepted: 04/15/2016] [Indexed: 11/23/2022] Open
Abstract
Fungal pure cultures identified with both classical morphological methods and through barcoding sequences are a basic requirement for reliable reference sequences in public databases. Improved techniques for an accelerated DNA barcode reference library construction will result in considerably improved sequence databases covering a wider taxonomic range. Fast, cheap, and reliable methods for obtaining DNA sequences from fungal isolates are, therefore, a valuable tool for the scientific community. Direct colony PCR was already successfully established for yeasts, but has not been evaluated for a wide range of anamorphic soil fungi up to now, and a direct amplification protocol for hyphomycetes without tissue pre-treatment has not been published so far. Here, we present a colony PCR technique directly from fungal hyphae without previous DNA extraction or other prior manipulation. Seven hundred eighty-eight fungal strains from 48 genera were tested with a success rate of 86%. PCR success varied considerably: DNA of fungi belonging to the genera Cladosporium, Geomyces, Fusarium, and Mortierella could be amplified with high success. DNA of soil-borne yeasts was always successfully amplified. Absidia, Mucor, Trichoderma, and Penicillium isolates had noticeably lower PCR success.
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Naegele RP, Quesada-Ocampo LM, Kurjan JD, Saude C, Hausbeck MK. Regional and Temporal Population Structure of Pseudoperonospora cubensis in Michigan and Ontario. PHYTOPATHOLOGY 2016; 106:372-379. [PMID: 26735060 DOI: 10.1094/phyto-02-15-0043-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cucurbit downy mildew (CDM), caused by the oomycete pathogen Pseudoperonospora cubensis, is a devastating disease that affects cucurbit species worldwide. This obligate, wind-dispersed pathogen does not overwinter in Michigan or other northern regions and new isolates can enter the state throughout the growing season. To evaluate the regional and temporal population structure of P. cubensis, sporangia from CDM lesions were collected from cucurbit foliage grown in Michigan and Ontario field locations in 2011. Population structure and genetic diversity were assessed in 257 isolates using nine simple sequence repeat markers. Genetic diversity was high for isolates from Michigan and Canada (0.6627 and 0.6131, respectively). Five genetic clusters were detected and changes in population structure varied by site and sampling date within a growing season. The Michigan and Canada populations were significantly differentiated, and a unique genetic cluster was detected in Michigan.
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Affiliation(s)
- R P Naegele
- First, third, and fifth authors: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing; second author: Department of Plant Pathology, North Carolina State University, Raleigh; and fourth author: Canadian Tobacco Research Foundation, Tillonsburg, Ontario, Canada
| | - L M Quesada-Ocampo
- First, third, and fifth authors: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing; second author: Department of Plant Pathology, North Carolina State University, Raleigh; and fourth author: Canadian Tobacco Research Foundation, Tillonsburg, Ontario, Canada
| | - J D Kurjan
- First, third, and fifth authors: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing; second author: Department of Plant Pathology, North Carolina State University, Raleigh; and fourth author: Canadian Tobacco Research Foundation, Tillonsburg, Ontario, Canada
| | - C Saude
- First, third, and fifth authors: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing; second author: Department of Plant Pathology, North Carolina State University, Raleigh; and fourth author: Canadian Tobacco Research Foundation, Tillonsburg, Ontario, Canada
| | - M K Hausbeck
- First, third, and fifth authors: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing; second author: Department of Plant Pathology, North Carolina State University, Raleigh; and fourth author: Canadian Tobacco Research Foundation, Tillonsburg, Ontario, Canada
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Ben Amar A, Oueslati S, Ghorbel A, Mliki A. Prediction and early detection of mycotoxigenic Fusarium culmorum in wheat by direct PCR-based procedure. Food Control 2012. [DOI: 10.1016/j.foodcont.2011.08.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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