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Belair M, Picot A, Lepais O, Masson C, Hébrard MN, Moronvalle A, Comont G, Gabri Martin VM, Tréguer S, Laloum Y, Corio-Costet MF, Michailides TJ, Moral J, Le Floch G, Pensec F. Genetic diversity and population structure of Botryosphaeria dothidea and Neofusicoccum parvum on English walnut (Juglans regia L.) in France. Sci Rep 2024; 14:19817. [PMID: 39191814 PMCID: PMC11350086 DOI: 10.1038/s41598-024-67613-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Accepted: 07/12/2024] [Indexed: 08/29/2024] Open
Abstract
Botryosphaeriaceae species are the major causal agents of walnut dieback worldwide, along with Diaporthe species. Botryosphaeria dothidea and Neofusicoccum parvum are the only two Botryosphaeriaceae species associated with this recently emergent disease in France, and little is known about their diversity, structure, origin and dispersion in French walnut orchards. A total of 381 isolates of both species were genetically typed using a sequence-based microsatellite genotyping (SSR-seq) method. This analysis revealed a low genetic diversity and a high clonality of these populations, in agreement with their clonal mode of reproduction. The genetic similarity among populations, regardless of the tissue type and the presence of symptoms, supports the hypothesis that these pathogens can move between fruits and twigs and display latent pathogen lifestyles. Contrasting genetic patterns between N. parvum populations from Californian and Spanish walnut orchards and the French ones suggested no conclusive evidence for pathogen transmission from infected materials. The high genetic similarity with French vineyards populations suggested instead putative transmission between these hosts, which was also observed with B. dothidea populations. Overall, this study provides critical insight into the epidemiology of two important pathogens involved in the emerging dieback of French walnut orchards, including their distribution, potential to mate, putative origin and disease pathways.
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Affiliation(s)
- Marie Belair
- Univ Brest, INRAE, Laboratoire Universitaire de Biodiversité et Écologie Microbienne, 29280, Plouzané, France
| | - Adeline Picot
- Univ Brest, INRAE, Laboratoire Universitaire de Biodiversité et Écologie Microbienne, 29280, Plouzané, France
| | | | - Cyrielle Masson
- Station d'expérimentation Nucicole Rhône Alpes, 38160, Chatte, France
| | | | - Aude Moronvalle
- Centre Technique Interprofessionnel des Fruits et Légumes, Centre Opérationnel de Lanxade, 24130, Prigonrieux, France
| | - Gwénaëlle Comont
- INRAE, UMR Santé et Agroécologie du Vignoble, ISVV, Labex Cote, CS 20032, 33882, Villenave d'Ornon, France
| | - Victor M Gabri Martin
- University of California Davis, Department of Plant Pathology, Kearney Agricultural Research and Extension Center, Parlier, CA, 93648, USA
| | - Sylvie Tréguer
- Univ Brest, INRAE, Laboratoire Universitaire de Biodiversité et Écologie Microbienne, 29280, Plouzané, France
| | - Yohana Laloum
- Centre Technique Interprofessionnel des Fruits et Légumes, Centre Opérationnel de Lanxade, 24130, Prigonrieux, France
| | - Marie-France Corio-Costet
- INRAE, UMR Santé et Agroécologie du Vignoble, ISVV, Labex Cote, CS 20032, 33882, Villenave d'Ornon, France
| | - Themis J Michailides
- University of California Davis, Department of Plant Pathology, Kearney Agricultural Research and Extension Center, Parlier, CA, 93648, USA
| | - Juan Moral
- Department of Agronomy (Maria de Maetzu Excellence Unit), University of Córdoba, Campus de Rabanales, 14071, Córdoba, Spain
| | - Gaétan Le Floch
- Univ Brest, INRAE, Laboratoire Universitaire de Biodiversité et Écologie Microbienne, 29280, Plouzané, France
| | - Flora Pensec
- Univ Brest, INRAE, Laboratoire Universitaire de Biodiversité et Écologie Microbienne, 29280, Plouzané, France.
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Matsiakh I, Menkis A. An Overview of Phytophthora Species on Woody Plants in Sweden and Other Nordic Countries. Microorganisms 2023; 11:1309. [PMID: 37317283 PMCID: PMC10221925 DOI: 10.3390/microorganisms11051309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/12/2023] [Accepted: 05/15/2023] [Indexed: 06/16/2023] Open
Abstract
The genus Phytophthora, with 326 species in 12 phylogenetic clades currently known, includes many economically important pathogens of woody plants. Different Phytophthora species often possess a hemibiotrophic or necrotrophic lifestyle, have either a broad or narrow host range, can cause a variety of disease symptoms (root rot, damping-off, bleeding stem cankers, or blight of foliage), and occur in different growing environments (nurseries, urban and agricultural areas, or forests). Here, we summarize the available knowledge on the occurrence, host range, symptoms of damage, and aggressiveness of different Phytophthora species associated with woody plants in Nordic countries with a special emphasis on Sweden. We evaluate the potential risks of Phytophthora species to different woody plants in this geographical area and emphasize the increasing threats associated with continued introduction of invasive Phytophthora species.
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Affiliation(s)
- Iryna Matsiakh
- Southern Swedish Forest Research Centre, SLU Forest Damage Centre, Swedish University of Agricultural Sciences, Sundsvägen 3, 23422 Alnarp, Sweden;
- Institute of Forestry and Park Gardening, Ukrainian National Forestry University, Pryrodna 19, 79057 Lviv, Ukraine
| | - Audrius Menkis
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, SLU Forest Damage Centre, Swedish University of Agricultural Sciences, P.O. Box 7026, 75007 Uppsala, Sweden
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Dobbs JT, Kim MS, Reynolds GJ, Wilhelmi N, Dumroese RK, Klopfenstein NB, Fraedrich SW, Cram MM, Bronson J, Stewart JE. Fusarioid community diversity associated with conifer seedlings in forest nurseries across the contiguous USA. FRONTIERS IN PLANT SCIENCE 2023; 14:1104675. [PMID: 36818886 PMCID: PMC9930990 DOI: 10.3389/fpls.2023.1104675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 01/10/2023] [Indexed: 06/18/2023]
Abstract
INTRODUCTION Fusarioid fungi that cause damping-off and root diseases can result in significant losses to conifer crops produced in forest nurseries across the USA. These nurseries are vital to reforestation and forest restoration efforts. Understanding the diversity of Fusarioid fungi associated with damping-off and root diseases of conifer seedlings can provide an approach for targeted management techniques to limit seedling losses and pathogen spread to novel landscapes. METHODS This study identifies 26 Fusarium spp. (F. acuminatum, F. annulatum, F. avenaceum, F. brachygibbosum, F. clavus, F. commune, F. cugenangense, F. diversisporum, F. elaeagni, F. elaeidis, F. flocciferum, F. fredkrugeri, F. fujikuroi, F. grosmichelii, F. ipomoeae, F. lactis, F. languescens, F. luffae, F. odoratissimum, F. oxysporum, F. queenslandicum, F. redolens, F. torulosum, F. triseptatum, F. vanleeuwenii, & F. verticillioides), 15 potential species within Fusarium and Neocosmospora species complexes (two from F. fujikuroi species complex, nine from F. oxysporum species complex, three from F. tricinctum species complex, and one from Neocosmospora species complex), and four Neocosmospora spp. (N. falciforme, N. metavorans, N. pisi, & N. solani) and associated host information collected from conifer-producing nurseries across the contiguous USA. RESULTS Phylogenetic analyses identified Fusarioid fungi haplotypes that were associated with 1) host specificity, 2) localization to geographic regions, or 3) generalists found on multiple hosts across diverse geographic regions. DISCUSSION The haplotypes and novel species identified on conifer seedlings should be considered for further analysis to determine pathogenicity, pathogen spread, and assess management practices.
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Affiliation(s)
- J. T. Dobbs
- Colorado State University, Department of Agricultural Biology, Fort Collins, CO, United States
| | - M.-S. Kim
- USDA Forest Service, Pacific Northwest Research Station, Corvallis, OR, United States
| | - G. J. Reynolds
- USDA Forest Service, Forest Health Protection – Region 3, Albuquerque, NM, United States
| | - N. Wilhelmi
- USDA Forest Service, Forest Health Protection – Region 3, Flagstaff, AZ, United States
| | - R. K. Dumroese
- USDA Forest Service, Rocky Mountain Research Station, Moscow, ID, United States
| | - N. B. Klopfenstein
- USDA Forest Service, Rocky Mountain Research Station, Moscow, ID, United States
| | - S. W. Fraedrich
- USDA Forest Service, Southern Research Station, Athens, GA, United States
| | - M. M. Cram
- USDA Forest Service, Forest Health Protection – Region 8, Athens, GA, United States
| | - J. Bronson
- USDA Forest Service, Forest Health Protection – Region 6, Medford, OR, United States
| | - J. E. Stewart
- Colorado State University, Department of Agricultural Biology, Fort Collins, CO, United States
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Bourret TB, Fajardo SN, Frankel SJ, Rizzo DM. Cataloging Phytophthora Species of Agriculture, Forests, Horticulture, and Restoration Outplantings in California, U.S.A.: A Sequence-Based Meta-Analysis. PLANT DISEASE 2023; 107:67-75. [PMID: 35724315 DOI: 10.1094/pdis-01-22-0187-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
California contains a diverse flora, and knowledge of the pathogens that threaten those plants is essential to managing their long-term health. To better understand threats to California plant health, a meta-analysis of Phytophthora detections within the state was conducted using publicly available sequences as a primary source of data rather than published records. Accessions of internal transcribed spacer (ITS) ribosomal DNA were cataloged from 800 Californian Phytophthora isolates, analyzed, and determined to correspond to 80 taxa, including several phylogenetically distinct provisional species. A number of Phytophthora taxa not previously reported from California were identified, including 20 described species. Pathways of introduction and spread were analyzed by categorizing isolates' origins, grouped by land-use: (i) agriculture, (ii) forests and other natural ecosystems, (iii) horticulture and nurseries, or (iv) restoration outplantings. The pooled Phytophthora metacommunities of the restoration outplantings and horticulture land-use categories were the most similar, whereas the communities pooled from forests and agriculture were least similar. Phytophthora cactorum, P. pini, P. pseudocryptogea, and P. syringae were identified in all four land-use categories, while 13 species were found in three. P. gonapodyides was the most common species by number of ITS accessions and exhibited the greatest diversity of ITS haplotypes. P. cactorum, P. ramorum, and P. nicotianae were associated with the greatest number of host genera. In this analysis, the Phytophthora spp. most prevalent in California differ from those compiled from the scientific literature.
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Affiliation(s)
- Tyler B Bourret
- Department of Plant Pathology, University of California, Davis, Davis, CA 95616
| | - Sebastian N Fajardo
- Department of Plant Pathology, University of California, Davis, Davis, CA 95616
| | - Susan J Frankel
- Pacific Southwest Research Station, United States Department of Agriculture Forest Service, Albany, CA 94710
| | - David M Rizzo
- Department of Plant Pathology, University of California, Davis, Davis, CA 95616
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Larson ER, Crandall SG. Recovery of the soil fungal microbiome after steam disinfection to manage the plant pathogen Fusarium solani. FRONTIERS IN PLANT SCIENCE 2023; 14:1128518. [PMID: 37152156 PMCID: PMC10161934 DOI: 10.3389/fpls.2023.1128518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 03/22/2023] [Indexed: 05/09/2023]
Abstract
Soil disinfection using high temperatures via steam is a promising approach to manage plant pathogens, pests, and weeds. Soil steaming is a viable option for growers who are moving away from dependence on chemical soil fumigants, especially in plant nursery or high tunnel environments. However, there are few studies that investigate how soil steaming causes substantial disturbance to the soil by killing both target pathogens and other soil biota. Steaming treatments also change the trajectory of the soil microbiome as it reassembles over time. Growers are interested in the health of soils after using steam-disinfection, especially if a virulent pathogen colonizes the soil and then flourishes in a situation where there are very few microbes to suppress its growth. Should recruitment of a virulent pathogen occur in the soil, this could have devasting effects on seed germination, seedling establishment and survival. Beneficial microbes are often used to prevent the colonization of plant pathogens, especially after a soil-steaming event. Here, we experimentally test how soil fungal communities assemble after steaming disinfection. We introduce to steam-treated soil Fusarium solani, an important fungal pathogen of soybean and Trichoderma harzianum, a known beneficial fungus used for soilborne pathogen suppression. Results show that F. solani significantly affects the relative abundance and diversity of the soil fungal microbiome, however, T. harzianum does not mitigate the amount of F. solani in the steam treated soil. Within the T. harzianum microbial addition, the soil fungal communities were similar to the control (steaming only). This result suggests inoculating the soil with T. harzianum does not drastically alter the assembly trajectory of the soil fungal microbiome. Other soil amendments such as a combination of Trichoderma spp. or other genera could suppress F. solani growth and shift soil microbiome composition and function post-steaming, however, more experimental research is needed.
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Affiliation(s)
- Eric R. Larson
- Department of Plant Pathology and Environmental Microbiology, Pennsylvania State University, University Park, PA, United States
- Microbiome Center, Penn State Institutes of the Life Sciences, University Park, PA, United States
- *Correspondence: Eric R. Larson,
| | - Sharifa G. Crandall
- Department of Plant Pathology and Environmental Microbiology, Pennsylvania State University, University Park, PA, United States
- Microbiome Center, Penn State Institutes of the Life Sciences, University Park, PA, United States
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Jung T, Milenković I, Corcobado T, Májek T, Janoušek J, Kudláček1 T, Tomšovský M, Nagy Z, Durán A, Tarigan M, Sanfuentes von Stowasser E, Singh R, Ferreira M, Webber J, Scanu B, Chi N, Thu P, Junaid M, Rosmana A, Baharuddin B, Kuswinanti T, Nasri N, Kageyama K, Hieno A, Masuya H, Uematsu S, Oliva J, Redondo M, Maia C, Matsiakh I, Kramarets V, O’Hanlon R, Tomić Ž, Brasier C, Horta Jung M. Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implications. PERSOONIA 2022; 49:1-57. [PMID: 38234379 PMCID: PMC10792230 DOI: 10.3767/persoonia.2022.49.01] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/13/2022] [Indexed: 01/19/2024]
Abstract
During extensive surveys of global Phytophthora diversity 14 new species detected in natural ecosystems in Chile, Indonesia, USA (Louisiana), Sweden, Ukraine and Vietnam were assigned to Phytophthora major Clade 10 based on a multigene phylogeny of nine nuclear and three mitochondrial gene regions. Clade 10 now comprises three subclades. Subclades 10a and 10b contain species with nonpapillate sporangia, a range of breeding systems and a mainly soil- and waterborne lifestyle. These include the previously described P. afrocarpa, P. gallica and P. intercalaris and eight of the new species: P. ludoviciana, P. procera, P. pseudogallica, P. scandinavica, P. subarctica, P. tenuimura, P. tonkinensis and P. ukrainensis. In contrast, all species in Subclade 10c have papillate sporangia and are self-fertile (or homothallic) with an aerial lifestyle including the known P. boehmeriae, P. gondwanensis, P. kernoviae and P. morindae and the new species P. celebensis, P. chilensis, P. javanensis, P. multiglobulosa, P. pseudochilensis and P. pseudokernoviae. All new Phytophthora species differed from each other and from related species by their unique combinations of morphological characters, breeding systems, cardinal temperatures and growth rates. The biogeography and evolutionary history of Clade 10 are discussed. We propose that the three subclades originated via the early divergence of pre-Gondwanan ancestors > 175 Mya into water- and soilborne and aerially dispersed lineages and subsequently underwent multiple allopatric and sympatric radiations during their global spread. Citation: Jung T, Milenković I, Corcobado T, et al. 2022. Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implications. Persoonia 49: 1-57. https://doi.org/10.3767/persoonia.2022.49.01.
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Affiliation(s)
- T. Jung
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
- Phytophthora Research and Consultancy, 83131 Nussdorf, Germany
| | - I. Milenković
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
- University of Belgrade, Faculty of Forestry, 11030 Belgrade, Serbia
| | - T. Corcobado
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - T. Májek
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - J. Janoušek
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - T. Kudláček1
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - M. Tomšovský
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - Z.Á Nagy
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
| | - A. Durán
- University of Belgrade, Faculty of Forestry, 11030 Belgrade, Serbia
- Research and Development, Asia Pacific Resources International Limited (APRIL), 28300 Pangkalan Kerinci, Riau, Indonesia
| | - M. Tarigan
- Research and Development, Asia Pacific Resources International Limited (APRIL), 28300 Pangkalan Kerinci, Riau, Indonesia
| | - E. Sanfuentes von Stowasser
- Laboratorio de Patología Forestal, Facultad Ciencias Forestales y Centro de Biotecnología, Universidad de Concepción, 4030000 Concepción, Chile
| | - R. Singh
- Plant Diagnostic Center, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, USA
| | - M. Ferreira
- Plant Diagnostic Center, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, USA
| | - J.F. Webber
- Forest Research, Alice Holt Lodge, Farnham, Surrey GU10 4LH, UK
| | - B. Scanu
- Department of Agricultural Sciences, University of Sassari, Viale Italia 39A, 07100 Sassari, Italy
| | - N.M. Chi
- Forest Protection Research Centre, Vietnamese Academy of Forest Sciences, 10000 Hanoi, Vietnam
| | - P.Q. Thu
- Forest Protection Research Centre, Vietnamese Academy of Forest Sciences, 10000 Hanoi, Vietnam
| | - M. Junaid
- Department of Plant Pest and Disease, Faculty of Agriculture, Hasanuddin University, Makassar, 90245, South Sulawesi, Indonesia
| | - A. Rosmana
- Department of Plant Pest and Disease, Faculty of Agriculture, Hasanuddin University, Makassar, 90245, South Sulawesi, Indonesia
| | - B. Baharuddin
- Department of Plant Pest and Disease, Faculty of Agriculture, Hasanuddin University, Makassar, 90245, South Sulawesi, Indonesia
| | - T. Kuswinanti
- Department of Plant Pest and Disease, Faculty of Agriculture, Hasanuddin University, Makassar, 90245, South Sulawesi, Indonesia
| | - N. Nasri
- Department of Forest Conservation, Faculty of Forestry, Hasanuddin University, Makassar, 90245, South Sulawesi, Indonesia
| | - K. Kageyama
- River Basin Research Center, Gifu University, Gifu, 501-1193, Japan
| | - A. Hieno
- River Basin Research Center, Gifu University, Gifu, 501-1193, Japan
| | - H. Masuya
- Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Ibaraki, 305-8687, Japan
| | - S. Uematsu
- Laboratory of Molecular and Cellular Biology, Dept. of Bioregulation and Bio-interaction, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
| | - J. Oliva
- Department of Crop and Forest Sciences, University of Lleida, Lleida 25198, Spain
| | - M. Redondo
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden
| | - C. Maia
- Centre of Marine Sciences (CCMAR), University of Algarve, 8005-139 Faro, Portugal
| | - I. Matsiakh
- Ukrainian National Forestry University, Pryrodna st.19, 79057, Lviv, Ukraine
| | - V. Kramarets
- Ukrainian National Forestry University, Pryrodna st.19, 79057, Lviv, Ukraine
| | - R. O’Hanlon
- Department of Agriculture, Food and the Marine, Dublin 2, D02 WK12, Ireland
| | - Ž. Tomić
- Center for Plant Protection, Croatian Agency for Agriculture and Food, 10000 Zagreb, Croatia
| | - C.M. Brasier
- Forest Research, Alice Holt Lodge, Farnham, Surrey GU10 4LH, UK
| | - M. Horta Jung
- Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Protection and Wildlife Management, Phytophthora Research Centre, 613 00 Brno, Czech Republic
- Phytophthora Research and Consultancy, 83131 Nussdorf, Germany
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La Spada F, Cock PJA, Randall E, Pane A, Cooke DEL, Cacciola SO. DNA Metabarcoding and Isolation by Baiting Complement Each Other in Revealing Phytophthora Diversity in Anthropized and Natural Ecosystems. J Fungi (Basel) 2022; 8:jof8040330. [PMID: 35448560 PMCID: PMC9028584 DOI: 10.3390/jof8040330] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 03/19/2022] [Accepted: 03/21/2022] [Indexed: 01/21/2023] Open
Abstract
Isolation techniques supplemented by sequencing of DNA from axenic cultures have provided a robust methodology for the study of Phytophthora communities in agricultural and natural ecosystems. Recently, metabarcoding approaches have emerged as new paradigms for the detection of Phytophthora species in environmental samples. In this study, Illumina DNA metabarcoding and a conventional leaf baiting isolation technique were compared to unravel the variability of Phytophthora communities in different environments. Overall, 39 rhizosphere soil samples from a natural, a semi-natural and a horticultural small-scale ecosystem, respectively, were processed by both baiting and metabarcoding. Using both detection techniques, 28 out of 39 samples tested positive for Phytophthora. Overall, 1,406,613 Phytophthora internal transcribed spacer 1 (ITS1) sequences and 155 Phytophthora isolates were obtained, which grouped into 21 taxa, five retrieved exclusively by baiting (P. bilorbang; P. cryptogea; P. gonapodyides; P. parvispora and P. pseudocryptogea), 12 exclusively by metabarcoding (P. asparagi; P. occultans; P. psycrophila; P. syringae; P. aleatoria/P. cactorum; P. castanetorum/P. quercina; P. iranica-like; P. unknown sp. 1; P. unknown sp. 2; P. unknown sp. 3; P. unknown sp. 4; P. unknown sp. 5) and four with both techniques (P. citrophthora, P. multivora, P. nicotianae and P. plurivora). Both techniques complemented each other in describing the variability of Phytophthora communities from natural and managed ecosystems and revealing the presence of rare or undescribed Phytophthora taxa.
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Affiliation(s)
- Federico La Spada
- Department of Agriculture, Food and Environment, University of Catania, 95123 Catania, Italy; (F.L.S.); (A.P.)
| | - Peter J. A. Cock
- The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK; (P.J.A.C.); (E.R.)
| | - Eva Randall
- The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK; (P.J.A.C.); (E.R.)
| | - Antonella Pane
- Department of Agriculture, Food and Environment, University of Catania, 95123 Catania, Italy; (F.L.S.); (A.P.)
| | - David E. L. Cooke
- The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK; (P.J.A.C.); (E.R.)
- Correspondence: (D.E.L.C.); (S.O.C.); Tel.: +39-095-7147371 (S.O.C.)
| | - Santa Olga Cacciola
- Department of Agriculture, Food and Environment, University of Catania, 95123 Catania, Italy; (F.L.S.); (A.P.)
- Correspondence: (D.E.L.C.); (S.O.C.); Tel.: +39-095-7147371 (S.O.C.)
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8
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Sims LL, Garbelotto M. Phytophthora species repeatedly introduced in Northern California through restoration projects can spread into adjacent sites. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02496-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Diversity of Phytophthora Species Detected in Disturbed and Undisturbed British Soils Using High-Throughput Sequencing Targeting ITS rRNA and COI mtDNA Regions. FORESTS 2021. [DOI: 10.3390/f12020229] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Disease outbreaks caused by introduced Phytophthora species have been increasing in British forests and woodlands in recent years. A better knowledge of the Phytophthora communities already present in the UK is of great importance when developing management and mitigation strategies for these diseases. To do this, soils were sampled in “disturbed” sites, meaning sites frequently visited by the public, with recent and new plantings or soil disturbances versus more “natural” forest and woodland sites with little disturbance or management. Phytophthora diversity was assessed using high-throughput Illumina sequencing targeting the widely accepted barcoding Internal Transcribed Spacer 1 (ITS1) region of rRNA and comparing it with the mitochondrial cytochrome c oxidase I (COI) gene. Isolation of Phytophthora was run in parallel. Nothophytophthora spp. and Phytophthora spp. were detected in 79 and 41 of the 132 locations of the 14 studied sites when using ITS or COI, respectively. A total of 20 Phytophthora amplicon sequence variants (ASVs) were assigned to known Phytophthora species from eight clades (1a, 2, 2b, 3a, 5, 6b, 7a, 8b, 8c, 8d, 10a, and 10b) and 12 ASVs from six clades (1a, 2c, 3a, 3b, 6b, 7a, 8b, 8c, and 8d) when using ITS or COI, respectively. Only at two locations were the results in agreement for ITS, COI, and isolation. Additionally, 21 and 17 unknown Phytophthora phylotypes were detected using the ITS and COI, respectively. Several Phytophthora spp. within clades 7 and 8, including very important forest pathogens such as P. austrocedri and P. ramorum, were identified and found more frequently at “disturbed” sites. Additionally, eight ASVs identified as Nothophytophthora spp. were detected representing the first report of species within this new genus in Britain. Only three species not known to be present in Britain (P. castaneae, P. capsici, and P. fallax) were detected with the ITS primers and not with COI. To confirm the presence of these or any potential new Phytophthora species, sites should be re-sampled for confirmation. Additionally, there is a need to confirm if these species are a threat to British trees and try to establish any eradication measures required to mitigate Phytophthora spread in Britain.
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