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Waqas M, Guarnaccia V, Bardella S, Spadaro D. Molecular Characterization and Pathogenicity of Diaporthe Species Causing Nut Rot of Hazelnut in Italy. Plant Dis 2024; 108:1005-1013. [PMID: 37883635 DOI: 10.1094/pdis-01-23-0168-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Hazelnut (Corylus avellana), a nut crop that is rapidly expanding worldwide, is endangered by a rot. Nut rot results in hazelnut defects. A survey was conducted in northwestern Italy during 2020 and 2021 to identify the causal agents of hazelnut rots. Typical symptoms of black rot, mold, and necrotic spots were observed on hazelnuts. The prevalent fungi isolated from symptomatic hazelnut kernels were Diaporthe spp. (38%), Botryosphaeria dothidea (26%), Diplodia seriata (14%), and other fungal genera with less frequent occurrences. Among 161 isolated Diaporthe spp., 40 were selected for further analysis. Based on morphological characterization and multilocus phylogenetic analysis of the ITS, tef-1α, and tub2, seven Diaporthe species were identified as D. eres, D. foeniculina, D. novem, D. oncostoma, D. ravennica, D. rudis, and D. sojae. D. eres was the main species isolated from hazelnut rots, in particular from moldy nuts. The pathogenicity test performed on hazelnuts 'Tonda Gentile del Piemonte' using a mycelium plug showed that all the Diaporthe isolates were pathogenic on their original host. To our knowledge, this work is the first report of D. novem, D. oncostoma, and D. ravennica on hazelnuts worldwide. D. foeniculina, D. rudis, and D. sojae were reported for the first time as agents of hazelnut rot in Italy. Future studies should focus on the comprehension of epidemiology and climatic conditions favoring the development of Diaporthe spp. on hazelnut. Prevention and control measures should target D. eres, representing the main causal agents responsible for defects and nut rot of hazelnuts in Italy.
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Affiliation(s)
- Muhammad Waqas
- Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino 10095, Grugliasco, TO, Italy
| | - Vladimiro Guarnaccia
- Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino 10095, Grugliasco, TO, Italy
- AGROINNOVA - Centre of Competence for the Innovation in the Agro-environmental Sector, University of Torino 10095, Grugliasco, TO, Italy
| | - S Bardella
- Fondazione Agrion - Via Falicetto, 24 12030, Manta, CN, Italy
| | - Davide Spadaro
- Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino 10095, Grugliasco, TO, Italy
- AGROINNOVA - Centre of Competence for the Innovation in the Agro-environmental Sector, University of Torino 10095, Grugliasco, TO, Italy
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2
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Sillo F, Brunetti C, Marroni F, Vita F, Dos Santos Nascimento LB, Vizzini A, Mello A, Balestrini R. Systemic effects of Tuber melanosporum inoculation in two Corylus avellana genotypes. Tree Physiol 2022; 42:1463-1480. [PMID: 35137225 DOI: 10.1093/treephys/tpac012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 01/28/2022] [Indexed: 06/14/2023]
Abstract
Roots of the European hazelnut (Corylus avellana L.), i.e., one of the most economically important nut species, form symbiosis with ectomycorrhizal (ECM) fungi, including truffles. Although physical interactions only occur in roots, the presence of mycorrhizal fungi can lead to metabolic changes at a systemic level, i.e., in leaves. However, how root colonization by ECM fungi modifies these processes in the host plant has so far not been widely studied. This work aimed to investigate the response in two C. avellana genotypes, focusing on leaves from plants inoculated with the black truffle Tuber melanosporum Vittad. Transcriptomic profiles of leaves of colonized plants were compared with those of non-colonized plants, as well as sugar and polyphenolic content. Results suggested that T. melanosporum has the potential to support plants in stressed conditions, leading to the systemic regulation of several genes involved in signaling and defense responses. Although further confirmation is needed, our results open new perspectives for future research aimed to highlight novel aspects in ECM symbiosis.
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Affiliation(s)
- Fabiano Sillo
- National Research Council - Institute for Sustainable Plant Protection (CNR-IPSP), Strada della Cacce 73, 10135 Torino, Italy
| | - Cecilia Brunetti
- National Research Council - Institute for Sustainable Plant Protection (CNR-IPSP), Via Madonna del Piano 10, 50019 Firenze, Italy
| | - Fabio Marroni
- Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Via delle Scienze 206, 33100 Udine, Italy
| | - Federico Vita
- Department of Biology, University of Bari Aldo Moro, Via E. Orabona 4, 70125 Bari, Italy
| | | | - Alfredo Vizzini
- Department of Life Sciences and Systems Biology, University of Torino, Viale P.A. Mattioli 25, 10125 Torino, Italy
- National Research Council - Institute for Sustainable Plant Protection (CNR-IPSP), Viale Mattioli 25, 10125 Torino, Italy
| | - Antonietta Mello
- National Research Council - Institute for Sustainable Plant Protection (CNR-IPSP), Viale Mattioli 25, 10125 Torino, Italy
| | - Raffaella Balestrini
- National Research Council - Institute for Sustainable Plant Protection (CNR-IPSP), Strada della Cacce 73, 10135 Torino, Italy
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Arciuolo R, Camardo Leggieri M, Chiusa G, Castello G, Genova G, Spigolon N, Battilani P. Ecology of Diaporthe eres, the causal agent of hazelnut defects. PLoS One 2021; 16:e0247563. [PMID: 33690684 PMCID: PMC7946276 DOI: 10.1371/journal.pone.0247563] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 02/09/2021] [Indexed: 11/19/2022] Open
Abstract
Diaporthe eres has been recently reported as the causal agent of hazelnut defects, with characteristic brown spots on the kernels surface and internal fruit discoloration. Knowledge regarding the ecology of this fungus is poor but, is critical to support a rationale and effective hazelnut crop protection strategy. Therefore, a study was performed to describe and model the effect of different abiotic factors such as temperature (T, 5-35°C, step 5°C) and water activity (aw 0.83-0.99, step 0.03) regimes on D. eres mycelial growth, pycnidial conidiomata development and asexual spore production during a 60-day incubation period. Alpha conidia germination was tested in the same T range and at different relative humidities (RH = 94, 97 and 100%) over 48 h incubation period. Fungal growth was observed from the first visual observation; regarding pycnidia and cirrhi, their development started after 8 and 19 days of incubation, respectively and increased over time. The optimum T for growth was 20-25°C and for pycnidia and cirrhi development was 30°C; aw ≥ 0.98 was optimal for the tested steps of the fungal cycle. The best condition for conidial germination of D. eres was at 25°C with RH = 100%. Quantitative data obtained were fitted using non- linear regression functions (Bete, logistic and polynomial), which provided a very good fit of the biological process (R2 = 0.793-0.987). These functions could be the basis for the development of a predictive model for the infection of D. eres of hazelnuts.
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Affiliation(s)
- Roberta Arciuolo
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza (PC), Italy
| | - Marco Camardo Leggieri
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza (PC), Italy
| | - Giorgio Chiusa
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza (PC), Italy
| | - Giuseppe Castello
- SOREMARTEC ITALIA S.r.l., Piazzale Pietro Ferrero 1, Alba (CN), Italy
| | - Giuseppe Genova
- SOREMARTEC ITALIA S.r.l., Piazzale Pietro Ferrero 1, Alba (CN), Italy
| | - Nicola Spigolon
- SOREMARTEC ITALIA S.r.l., Piazzale Pietro Ferrero 1, Alba (CN), Italy
| | - Paola Battilani
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza (PC), Italy
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Spadaro D, Meloni GR, Siciliano I, Prencipe S, Gullino ML. HPLC-MS/MS Method for the Detection of Selected Toxic Metabolites Produced by Penicillium spp. in Nuts. Toxins (Basel) 2020; 12:E307. [PMID: 32397224 PMCID: PMC7290882 DOI: 10.3390/toxins12050307] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 04/25/2020] [Accepted: 05/04/2020] [Indexed: 11/16/2022] Open
Abstract
Penicillium spp. are emerging as producers of mycotoxins and other toxic metabolites in nuts. A HPLC-MS/MS method was developed to detect 19 metabolites produced by Penicillium spp. on chestnuts, hazelnuts, walnuts and almonds. Two extraction methods were developed, one for chestnuts and one for the other three nuts. The recovery, LOD, LOQ and matrix effect were determined for each analyte and matrix. Correlation coefficients were always >99.99%. In walnuts, a strong signal suppression was observed for most analytes and patulin could not be detected. Six strains: Penicillium bialowiezense, P. brevicompactum, P. crustosum, P. expansum, P. glabrum and P. solitum, isolated from chestnuts, were inoculated on four nuts. Chestnuts favored the production of the largest number of Penicillium toxic metabolites. The method was used for the analysis of 41 commercial samples: 71% showed to be contaminated by Penicillium-toxins. Cyclopenin and cyclopenol were the most frequently detected metabolites, with an incidence of 32% and 68%, respectively. Due to the risk of contamination of nuts with Penicillium-toxins, future studies and legislation should consider a larger number of mycotoxins.
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Affiliation(s)
- Davide Spadaro
- Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy; (G.R.M.); (I.S.); (S.P.); (M.L.G.)
- Department of Agricultural, Forestry and Food Sciences (DISAFA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy
| | - Giovanna Roberta Meloni
- Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy; (G.R.M.); (I.S.); (S.P.); (M.L.G.)
- Department of Agricultural, Forestry and Food Sciences (DISAFA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy
| | - Ilenia Siciliano
- Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy; (G.R.M.); (I.S.); (S.P.); (M.L.G.)
| | - Simona Prencipe
- Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy; (G.R.M.); (I.S.); (S.P.); (M.L.G.)
- Department of Agricultural, Forestry and Food Sciences (DISAFA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy
| | - Maria Lodovica Gullino
- Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy; (G.R.M.); (I.S.); (S.P.); (M.L.G.)
- Department of Agricultural, Forestry and Food Sciences (DISAFA), University of Torino, Largo P. Braccini 2, 10095 Grugliasco (TO), Italy
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Nikolaieva N, Kačániová M, González JC, Grygorieva O, Nôžková J. Determination of microbiological contamination, antibacterial and antioxidant activities of natural plant hazelnut ( Corylus avellana L.) pollen. J Environ Sci Health B 2019; 54:525-532. [PMID: 31046581 DOI: 10.1080/03601234.2019.1603756] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aim of our study is to determine microbial contamination, antibacterial and antioxidant activities of 14 pollen samples of Corylus avellana collected from different locations in Slovakia. Microbiological analysis was carried out in two steps: microbiological assays and studies of antibacterial activity of pollen extracts. The antimicrobial properties of pollen extracts were carried out with the disc-diffusion method. Methanol (70%), ethanol (70%) and distilled water were used for pollen extracts. Five strains of bacteria such as gram-negative (Salmonella enterica subsp. enterica CCM 3807, Escherichia coli CCM 2024, and Yersinia enterocolitica CCM 5671) and gram-positive (Staphylococcus aureus CCM 2461 and Bacillus thuringiensis CCM 19T) were tested. Antioxidant activity of pollen extracts was determined by the DPPH method. Bacterial analysis includes the determination of the total bacterial count ranged from 4.08 to 4.61 log CFU g-1, mesophilic aerobic bacteria ranged from 3.40 to 4.89 log CFU g-1, mesophilic anaerobic bacteria ranged from 3.20 to 4.52 log CFU g-1, coliform bacteria ranged from 3.30 to 4.55 log CFU g-1, yeasts and filamentous fungi ranged from 3.00 to 3.56 log CFU g-1. Microscopic filamentous fungi Aspergillus spp., Alternaria spp., Penicillium spp., Cladosporium spp., Rhizopus spp., and Paecylomyces spp. were isolated from hazelnut pollen. Yersinia enterocolitica was the most sensitive strain among ethanolic and methanolic pollen hazelnut extracts. Staphylococcus aureus was the most sensitive strain against aqueous hazelnut pollen extracts. We determined the following sensitivity against ethanol pollen extracts respectively: Yersinia enterocolitica > Salmonella enterica > Staphylococcus aureus > Bacillus thuringiensis > Escherichia coli. Methanol pollen extracts had shown following sensitivity: Yersinia enterocolitica > Salmonella enterica > Escherichia coli > Staphylococcus aureus > Bacillus thuringiensis. Aqueous extracts had shown the following sensitivity: Staphylococcus aureus > Salmonella enterica > Escherichia coli > Bacillus thuringiensis > Yersinia enterocolitica. Hazelnut pollen extracts have over 82% antioxidant capacity in samples from non-urban zones. An elevated level of antioxidant potential in the pollen is determined by its biological properties conditioned by biologically active substances. DPPH method allowed characterizing pollen as a source of antioxidants.
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Affiliation(s)
- Nataliia Nikolaieva
- a Department of Genetics and Plant Breeding, Faculty of Agrobiology and Food Resources , Slovak University of Agriculture in Nitra , Nitra , Slovak Republic
| | - Miroslava Kačániová
- b Department of Microbiology, Faculty of Biotechnology and Food Sciences , Slovak University of Agriculture in Nitra , Nitra , Slovak Republic
- c Department of Bioenergetics and Food Analysis, Faculty of Biology and Agriculture , Rzeszow University , Rzeszow , Poland
| | - Jacinta Collado González
- d Departamento Tecnología Agroalimentaria, Grupo "Calidad y Seguridad Alimentaria (CSA) , University Miguel Hernández de Elche (UMH), Carretera de Beniel , Orihuela , Alicante , Spain
| | - Olga Grygorieva
- e Department of Fruit Plants Acclimatization , M.M. Gryshko National Botanical Garden of Ukraine of National Academy of Sciences , Kyiv , Ukraine
| | - Janka Nôžková
- a Department of Genetics and Plant Breeding, Faculty of Agrobiology and Food Resources , Slovak University of Agriculture in Nitra , Nitra , Slovak Republic
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Pscheidt JW, Heckert S, Wiseman M, Jones L. Fungi Associated with and Influence of Moisture on Development of Kernel Mold of Hazelnut. Plant Dis 2019; 103:922-928. [PMID: 30856076 DOI: 10.1094/pdis-09-18-1520-re] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Kernel mold on hazelnuts is defined by the United States Department of Agriculture, U.S.A., as any visible fungal growth either on the outside or inside of the kernel. Only one yeast and one filamentous fungus have been associated with kernel mold of hazelnut in Oregon. In this report, fungi were isolated from kernels with mold and identified using morphological and molecular characters. Penicillium spp. were isolated most often from kernels with mold, but species of Aspergillus and Cladosporium and Diaporthe rudis were also frequently isolated. Additional fungi from three other genera were also isolated. All of the same fungi were also isolated from symptomless kernels. Eremothecium coryli or Ramularia sp. previously associated with kernel defects in Oregon were not found associated with symptoms of kernel mold. Incidence of mold was the highest when nuts were incubated in moist chambers on wet, nonautoclaved orchard soil and was significantly higher than kernel mold found in nuts incubated on either air-dried soil or wet, autoclaved soil. Preventing hazelnuts from coming in contact with wet soil in the field using elevated wire screens resulted in significantly less mold development in two out of three years evaluated. Nuts on screens had a greater chance to dry out between rainstorms as measured by significantly lower nut moisture levels at harvest.
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Affiliation(s)
- J W Pscheidt
- 1 Department of Botany & Plant Pathology, Oregon State University, Corvallis, OR 97331; and
| | - S Heckert
- 1 Department of Botany & Plant Pathology, Oregon State University, Corvallis, OR 97331; and
| | - M Wiseman
- 1 Department of Botany & Plant Pathology, Oregon State University, Corvallis, OR 97331; and
| | - L Jones
- 2 Plant & Food Research (USA) LLC, Davis, CA 95616
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Salehi M, Moieni A, Safaie N. Elicitors Derived from Hazel (Corylus avellana L.) Cell Suspension Culture Enhance Growth and Paclitaxel Production of Epicoccum nigrum. Sci Rep 2018; 8:12053. [PMID: 30104672 PMCID: PMC6089963 DOI: 10.1038/s41598-018-29762-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 07/18/2018] [Indexed: 11/27/2022] Open
Abstract
The microbial fermentation is considered as the potential source for large-scale production of paclitaxel. Since co-cultivation/mixed fermentation strategy has been reported as a yield enhancement strategy for paclitaxel production, investigation of fungal endophyte response to plant culture medium, plant cell extract (CE) and medium filtrate (MF) of plant cell suspension culture in terms of growth and paclitaxel production is interesting. In this study, 35 endophytic fungi were isolated from Taxus baccata and Corylus avellana grown in Iran. The analysis of high-performance liquid chromatography and mass spectrometry showed that one isolate (YEF2) produced paclitaxel. The isolate YEF2 was identified as Epicoccum nigrum by sequencing of ITS1-5.8S-ITS2 rDNA region and actin gene. YEF2 was slow-growing in Murashige and Skoog medium, but the synergistic interaction of gibberellic acid (GA3) and CE of C. avellana enhanced the growth of YEF2. The highest total yield of paclitaxel (314.7 µg/l; 11.5-folds) of E. nigrum strain YEF2 was obtained by using 28% (v/v) filter sterilized CE of C. avellana and 2 µg ml-1 GA3 that was significantly higher than the control. In this study, the effects of the plant cell extract on growth and paclitaxel production of paclitaxel producing endophytic fungus were studied for the first time.
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Affiliation(s)
- Mina Salehi
- Plant Breeding and Biotechnology Department, Faculty of Agriculture, Tarbiat Modares University, Tehran, P.O. Box 14115-336, Iran
| | - Ahmad Moieni
- Plant Breeding and Biotechnology Department, Faculty of Agriculture, Tarbiat Modares University, Tehran, P.O. Box 14115-336, Iran
| | - Naser Safaie
- Plant Pathology Department, Faculty of Agriculture, Tarbiat Modares University, Tehran, P.O. Box 14115-336, Iran.
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Feng L, Muyyarikkandy MS, Brown SRB, Amalaradjou MA. Attachment and Survival of Escherichia coli O157:H7 on In-Shell Hazelnuts. Int J Environ Res Public Health 2018; 15:ijerph15061122. [PMID: 29849011 PMCID: PMC6025523 DOI: 10.3390/ijerph15061122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 05/26/2018] [Accepted: 05/28/2018] [Indexed: 11/16/2022]
Abstract
The multistate Escherichia coli (E. coli) O157:H7 outbreak associated with in-shell hazelnuts highlights the pathogen's ability to involve non-traditional vehicles in foodborne infections. Furthermore, it underscores significant gaps in our knowledge of pathogen survivability and persistence on nuts. Therefore, this study investigated the ability of E. coli O157:H7 to attach and survive on in-shell hazelnuts. In-shell hazelnuts were inoculated with a four-strain mixture of E. coli O157:H7 at 7.6 log colony forming units (CFU)/nut by wet or dry inoculation, stored at ambient conditions (24 ± 1 °C; 40% ± 3% relative humidity (RH) and sampled for twelve months. For the attachment assay, in-shell hazelnuts were inoculated and the adherent population was enumerated at 30 s-1 h following inoculation. Irrespective of the inoculation method, ~5 log CFU of adherent E. coli O157:H7 was recovered from the hazelnuts as early as 30 s after inoculation. Conversely, pathogen survival was significantly reduced under dry inoculation with samples being enrichment negative after five months of storage (p < 0.05). On the other hand, wet inoculation led to a significantly longer persistence of the pathogen with ~3 log CFU being recovered from the in-shell nuts at 12 months of storage (p < 0.05). These results indicate that E. coli O157:H7 can survive in significant numbers on in-shell hazelnuts when stored under ambient conditions.
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Affiliation(s)
- Lingyu Feng
- Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA.
| | | | - Stephanie R B Brown
- Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA.
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Pscheidt JW, Heckert S, Cluskey SA. Tank Mixing Fungicides for Effectiveness Against Eastern Filbert Blight of Hazelnut. Plant Dis 2018; 102:919-924. [PMID: 30673392 DOI: 10.1094/pdis-08-17-1298-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hazelnut (Corylus avellana) production in Oregon primarily occurs on cultivars susceptible to Anisogramma anomala, the causal agent of eastern filbert blight (EFB). Management of EFB involves planting resistant cultivars, removal of cankered limbs, and the application of fungicides. Tank mixes of demethylation-inhibiting (DMI; Fungicide Resistance Action Committee [FRAC] group 3) or quinone outside inhibitor (QoI; FRAC group 11) fungicides with chlorothalonil (FRAC group M5) at full or reduced rates were evaluated for effectiveness against A. anomala. The use of chlorothalonil in a mix with a DMI or QoI fungicide was an effective treatment for EFB even if each component of the mix was at half the labeled rate. Different liquid or dry formulations of chlorothalonil were equally effective in a tank mix for EFB control. The combination of propiconazole (FRAC group 3) tank mixed with trifloxystrobin (FRAC group 11) was not effective, whereas trees treated with propiconazole tank mixed with pyraclostrobin (FRAC group 11) resulted in significantly fewer EFB cankers compared with nontreated trees. When using tank mixes for EFB management, DMI fungicides should remain at full rates while mixing with a half-rate of chlorothalonil. In contrast, QoI fungicides and chlorothalonil could both be used at half-rates and still maintain acceptable EFB control. Tank mixing chlorothalonil with fungicides at risk of resistance development can help maintain consistent EFB control and should help prevent or delay the emergence of fungicide-resistant A. anomala isolates.
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Affiliation(s)
- J W Pscheidt
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
| | - S Heckert
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
| | - S A Cluskey
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
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Cimmino A, Nocera P, Linaldeddu BT, Masi M, Gorecki M, Pescitelli G, Montecchio L, Maddau L, Evidente A. Phytotoxic Metabolites Produced by Diaporthella cryptica, the Causal Agent of Hazelnut Branch Canker. J Agric Food Chem 2018; 66:3435-3442. [PMID: 29537269 DOI: 10.1021/acs.jafc.8b00256] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
From the culture filtrates of Diaporthella cryptica, an emerging hazelnut pathogen, 2-hydroxy-3-phenylpropanoate methyl ester and its 3-(4-hydroxyphenyl) and 3-(1 H-indol-3-yl) analogues, named crypticins A-C, were isolated together with the well-known tyrosol. Crypticins A-C were identified by spectroscopic (essentially nuclear magnetic resonance and high-resolution electrospray ionization mass spectrometry) methods. The R absolute configuration (AC) of crypticin A was determined by comparing its optical rotation and electronic circular dichroism (ECD) spectrum with those of papuline, the methyl ester of (-)( S)-phenyllactic acid isolated as the main phytotoxin of Pseudomonas syringae pv. papulans, responsible for apple blister spot. The ACs of crypticins B and C were determined by time-dependent density functional theory calculations of their ECD spectra. Papuline and the new metabolites herein isolated, except tyrosol, were tested at 1 mg/mL on cork oak, grapevine, hazelnut, and holm oak leaves using the leaf puncture assay. They were also tested on tomato cuttings at 0.5 and 0.05 mg/mL. In the leaf puncture assay, none of the compounds was found to be active. Crypticin C and papuline were active in the tomato cutting assay. Additionally, crypticin C displayed moderate inhibitory effect against Phytophthora cambivora.
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Affiliation(s)
- Alessio Cimmino
- Dipartimento Scienze Chimiche , Università di Napoli Federico II , Complesso Universitario Monte S. Angelo, Via Cintia 4 , Napoli 80126 , Italy
| | - Paola Nocera
- Dipartimento Scienze Chimiche , Università di Napoli Federico II , Complesso Universitario Monte S. Angelo, Via Cintia 4 , Napoli 80126 , Italy
| | - Benedetto Teodoro Linaldeddu
- Dipartimento Territorio e Sistemi Agro-Forestali , Università di Padova , Viale dell'Università 16 , Legnaro , Padova 35020 , Italy
| | - Marco Masi
- Dipartimento Scienze Chimiche , Università di Napoli Federico II , Complesso Universitario Monte S. Angelo, Via Cintia 4 , Napoli 80126 , Italy
| | - Marcin Gorecki
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Moruzzi, 13 , Pisa 56124 , Italy
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Moruzzi, 13 , Pisa 56124 , Italy
| | - Lucio Montecchio
- Dipartimento Territorio e Sistemi Agro-Forestali , Università di Padova , Viale dell'Università 16 , Legnaro , Padova 35020 , Italy
| | - Lucia Maddau
- Dipartimento di Agraria, Sezione di Patologia Vegetale ed Entomologia , Università degli Studi di Sassari , Viale Italia 39 , Sassari 07100 , Italy
| | - Antonio Evidente
- Dipartimento Scienze Chimiche , Università di Napoli Federico II , Complesso Universitario Monte S. Angelo, Via Cintia 4 , Napoli 80126 , Italy
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11
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Pscheidt JW, Heckert S, Cluskey SA. Evaluation of Quinone Outside and Succinate Dehydrogenase Inhibitors for Effectiveness Against Eastern Filbert Blight of Hazelnut. Plant Dis 2017; 101:1868-1873. [PMID: 30677311 DOI: 10.1094/pdis-02-17-0224-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Most of the hazelnut production in Oregon, a value of $130 million in 2014, was based on eastern filbert blight (EFB) susceptible cultivars. On these cultivars, EFB management involves, among other tactics, fungicide treatment during bud break and early shoot growth. Many active ingredients have been shown to be effective against EFB. This report summarizes the evaluation of quinone outside (QoI, FRAC group 11) and succinate dehydrogenase (SDHI, FRAC group 7) inhibitors alone and in combination with each other or with demethylation-inhibiting (DMI, FRAC group 3) fungicides for management of EFB. Based on a meta-analysis, picoxystrobin, pyraclostrobin, or trifloxystrobin alone resulted in significant control over nontreated trees ranging between 64 and 74%. Fluoxastrobin was not as effective as other QoI fungicides with an average of 44% control and high variability. SDHI fungicides as a group were less useful for management of EFB with boscalid, fluopyram, and penthiopyrad ineffective while fluxapyroxad averaged 83% control against EFB. Prepackaged mixes of QoI materials with either SDHI or DMI fungicides were also significantly effective against EFB. Use of QoI fungicides and the SDHI material fluxapyroxad offers added flexibility and complexity within EFB management programs. Growers can incorporate any of five different modes of action in EFB management programs including FRAC groups M1, M5, 3, 7, and 11.
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Affiliation(s)
- J W Pscheidt
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
| | - S Heckert
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
| | - S A Cluskey
- Department of Botany & Plant Pathology, Oregon State University, Corvallis 97331
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12
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Sathuvalli V, Mehlenbacher SA, Smith DC. High-Resolution Genetic and Physical Mapping of the Eastern Filbert Blight Resistance Region in 'Jefferson' Hazelnut ( Corylus avellana L.). Plant Genome 2017; 10. [PMID: 28724074 DOI: 10.3835/plantgenome2016.12.0123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Eastern filbert blight (EFB), caused by the pyrenomycete (Peck) E. Müller, is a devastating disease of European hazelnut ( L) in the US Pacific Northwest. A dominant allele at a single locus from the obsolete pollenizer 'Gasaway' confers a high level of resistance to EFB. To identify the gene responsible for resistance, we initiated map-based cloning efforts in a population of 1488 seedlings that segregated for resistance. Chromosome walking was initiated using primers designed from eight previously identified random amplified polymorphic DNA markers linked to resistance. The bacterial artificial chromosome (BAC) library was screened using the primer pairs in a polymerase chain reaction-based pooling and subpooling strategy. Here, we report construction of a high-resolution genetic map and a physical map of the resistance region. Further, we sequenced BACs in the resistance region and identified and annotated the coding sequences. In seven contigs <1 cM from the resistance locus, 233 genes were predicted. The putative genes were compared with sequences in GenBank using a BLASTP search. Fifty-one markers were placed on the high-resolution genetic map, including markers newly developed from the BACs. Segregation in the mapping population placed the resistance locus in a single contig of three BACs (43F13, 66C22, and 85B7). Two of the putative genes are in the p-loop NTPase and F-box super-families localized in a 135-kb BAC, which have previously been shown to have disease-resistance properties. Further mapping, complementation, and expression tests of the genes in these BACs is essential to confirm which confer resistance to EFB.
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Iotti M, Piattoni F, Leonardi P, Hall IR, Zambonelli A. First evidence for truffle production from plants inoculated with mycelial pure cultures. Mycorrhiza 2016; 26:793-798. [PMID: 27103310 DOI: 10.1007/s00572-016-0703-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 04/15/2016] [Indexed: 06/05/2023]
Abstract
Truffle (Tuber spp.) cultivation is based on raising mycorrhizal trees in greenhouses that have been inoculated with suspensions of ascospores. The problem with this is that pests, pathogens, and other mycorrhizal fungi can contaminate the trees. Furthermore, because ascospores are produced sexually, each plant potentially has a different genetic mycorrhizal makeup from each other so tailoring the mycorrhizal component of plants to suit a particular set of soil and climatic conditions is out of the question. Here, we report on the production of Tuber borchii-mycorrhized plants using pure cultures, establishing a truffière with these and subsequent production of its fruiting bodies. This study opens up the possibility of producing commercial numbers of Tuber-mycorrhized trees for truffle cultivation using mycelial inoculation techniques. It also poses questions about the mechanism of fertilization between the different strains which were located in different parts of the experimental truffière.
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Affiliation(s)
- Mirco Iotti
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Via Vetoio, Coppito 1, L'Aquila, 67100, Italy
| | - Federica Piattoni
- Department of Agricultural Sciences, Bologna University, Viale Fanin 46, 40127, Bologna, Italy
| | - Pamela Leonardi
- Department of Agricultural Sciences, Bologna University, Viale Fanin 46, 40127, Bologna, Italy
| | - Ian R Hall
- Truffles and Mushrooms (Consulting) Ltd, P.O. Box 268, Dunedin, 9054, New Zealand
| | - Alessandra Zambonelli
- Department of Agricultural Sciences, Bologna University, Viale Fanin 46, 40127, Bologna, Italy.
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Sillo F, Fangel JU, Henrissat B, Faccio A, Bonfante P, Martin F, Willats WGT, Balestrini R. Understanding plant cell-wall remodelling during the symbiotic interaction between Tuber melanosporum and Corylus avellana using a carbohydrate microarray. Planta 2016; 244:347-59. [PMID: 27072675 DOI: 10.1007/s00425-016-2507-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 03/24/2016] [Indexed: 05/09/2023]
Abstract
A combined approach, using a carbohydrate microarray as a support for genomic data, has revealed subtle plant cell-wall remodelling during Tuber melanosporum and Corylus avellana interaction. Cell walls are involved, to a great extent, in mediating plant-microbe interactions. An important feature of these interactions concerns changes in the cell-wall composition during interaction with other organisms. In ectomycorrhizae, plant and fungal cell walls come into direct contact, and represent the interface between the two partners. However, very little information is available on the re-arrangement that could occur within the plant and fungal cell walls during ectomycorrhizal symbiosis. Taking advantage of the Comprehensive Microarray Polymer Profiling (CoMPP) technology, the current study has had the aim of monitoring the changes that take place in the plant cell wall in Corylus avellana roots during colonization by the ascomycetous ectomycorrhizal fungus T. melanosporum. Additionally, genes encoding putative plant cell-wall degrading enzymes (PCWDEs) have been identified in the T. melanosporum genome, and RT-qPCRs have been performed to verify the expression of selected genes in fully developed C. avellana/T. melanosporum ectomycorrhizae. A localized degradation of pectin seems to occur during fungal colonization, in agreement with the growth of the ectomycorrhizal fungus through the middle lamella and with the fungal gene expression of genes acting on these polysaccharides.
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Affiliation(s)
- Fabiano Sillo
- Dipartimento di Scienze Della Vita e Biologia dei Sistemi, Università di Torino, Torino, Italy
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università di Torino, Largo Paolo Braccini 2, Grugliasco, 10095, Turin, Italy
| | - Jonatan U Fangel
- Section for Plant Glycobiology, Department of Plant and Environmental Sciences, Copenhagen University, Copenhagen, Denmark
| | - Bernard Henrissat
- Centre National de la Recherche Scientifique, UMR 7257, 13288, Marseille, France
- Architecture et Fonction des Macromolécules Biologiques, Aix-Marseille University, 13288, Marseille, France
- INRA, USC 1408 AFMB, 13288, Marseille, France
- Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Antonella Faccio
- Istituto per la Protezione Sostenibile delle Piante (IPSP) del CNR, Torino Unit, Viale Mattioli 25, 10125, Torino, Italy
| | - Paola Bonfante
- Dipartimento di Scienze Della Vita e Biologia dei Sistemi, Università di Torino, Torino, Italy
| | - Francis Martin
- Laboratoire d'excellence ARBRE, Institut National de la Recherche Agronomique (INRA), UMR 1136 Interactions Arbres/Microorganismes, INRA-Nancy, 54 280, Champenoux, France
| | - William G T Willats
- Section for Plant Glycobiology, Department of Plant and Environmental Sciences, Copenhagen University, Copenhagen, Denmark
| | - Raffaella Balestrini
- Istituto per la Protezione Sostenibile delle Piante (IPSP) del CNR, Torino Unit, Viale Mattioli 25, 10125, Torino, Italy.
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Deveau A, Antony-Babu S, Le Tacon F, Robin C, Frey-Klett P, Uroz S. Temporal changes of bacterial communities in the Tuber melanosporum ectomycorrhizosphere during ascocarp development. Mycorrhiza 2016; 26:389-399. [PMID: 26781750 DOI: 10.1007/s00572-015-0679-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 12/28/2015] [Indexed: 06/05/2023]
Abstract
Ectomycorrhizae create a multitrophic ecosystem formed by the association between tree roots, mycelium of the ectomycorrhizal fungus, and a complex microbiome. Despite their importance in the host tree's physiology and in the functioning of the ectomycorrhizal symbiosis, detailed studies on ectomycorrhiza-associated bacterial community composition and their temporal dynamics are rare. Our objective was to investigate the composition and dynamics of Tuber melanosporum ectomycorrhiza-associated bacterial communities from summer to winter seasons in a Corylus avellana tree plantation. We used 16S ribosomal RNA (rRNA)-based pyrosequencing to compare the bacterial community structure and the richness in T. melanosporum's ectomycorrhizae with those of the bulk soil. The T. melanosporum ectomycorrhizae harbored distinct bacterial communities from those of the bulk soil, with an enrichment in Alpha- and Gamma-proteobacteria. In contrast to the bacterial communities of truffle ascocarps that vastly varies in composition and richness during the maturation of the fruiting body and to those from the bulk soil, T. melanosporum ectomycorrhiza-associated bacterial community composition stayed rather stable from September to January. Our results fit with a recent finding from the same experimental site at the same period that a continuous supply of carbohydrates and nitrogen occurs from ectomycorrhizae to the fruiting bodies during the maturation of the ascocarps. We propose that this creates a stable niche in the ectomycorrhizosphere although the phenology of the tree changes.
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Affiliation(s)
- Aurélie Deveau
- UMR1136 INRA Université de Lorraine, Interactions Arbres - Microorganismes, F-54280, Champenoux, France.
- Université de Lorraine, UMR1136, Interactions Arbres - Microorganismes, F-54500, Vandœuvre-lès-Nancy, France.
| | - Sanjay Antony-Babu
- UMR1136 INRA Université de Lorraine, Interactions Arbres - Microorganismes, F-54280, Champenoux, France
- Université de Lorraine, UMR1136, Interactions Arbres - Microorganismes, F-54500, Vandœuvre-lès-Nancy, France
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - François Le Tacon
- UMR1136 INRA Université de Lorraine, Interactions Arbres - Microorganismes, F-54280, Champenoux, France
- Université de Lorraine, UMR1136, Interactions Arbres - Microorganismes, F-54500, Vandœuvre-lès-Nancy, France
| | - Christophe Robin
- Université de Lorraine, UMR 1121, Agronomie & Environnement, Nancy-Colmar, 54500, Vandœuvre-lès-Nancy, France
- INRA, UMR 1121, Agronomie & Environnement, Nancy-Colmar, Centre INRA de Nancy-Lorraine, 54500, Vandœuvre-lès-Nancy, France
| | - Pascale Frey-Klett
- UMR1136 INRA Université de Lorraine, Interactions Arbres - Microorganismes, F-54280, Champenoux, France
- Université de Lorraine, UMR1136, Interactions Arbres - Microorganismes, F-54500, Vandœuvre-lès-Nancy, France
| | - Stéphane Uroz
- UMR1136 INRA Université de Lorraine, Interactions Arbres - Microorganismes, F-54280, Champenoux, France
- Université de Lorraine, UMR1136, Interactions Arbres - Microorganismes, F-54500, Vandœuvre-lès-Nancy, France
- INRA, UR1138, Biogéochimie des écosystèmes forestiers, F-54280, Champenoux, France
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16
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Lamichhane JR, Bartoli C, Varvaro L. Extensive Field Survey, Laboratory and Greenhouse Studies Reveal Complex Nature of Pseudomonas syringae-Associated Hazelnut Decline in Central Italy. PLoS One 2016; 11:e0147584. [PMID: 26840951 PMCID: PMC4739619 DOI: 10.1371/journal.pone.0147584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 01/04/2016] [Indexed: 12/01/2022] Open
Abstract
Pseudomonas avellanae (Pav) has been reported as the causal agent of bacterial decline and bacterial canker of hazelnut in Italy and Greece, respectively. Both hazelnut diseases were reported to be similar in terms of symptoms, severity and persistence. In this study, we found that both symptomatic and asymptomatic trees in the field were colonized by Pav. Multilocus Sequence Typing (MLST) analysis showed that Pav strains isolated during this study in Italy belong to the P. syringae phylogroup 1 and they are closely related to Pav strains previously isolated in Greece from hazelnut bacterial canker. On the other hand, strains isolated in earlier studies from hazelnut decline in Italy belong to both phylogroup 1 and 2 of P. syringae. Both phylogroup 1 strains of P. syringae from Greece and Italy are different than strains isolated in this study in terms of their capacity to excrete fluorescent pigments on different media. Despite the same plant genotype and cropping practices adopted, the incidence of hazelnut decline ranged from nearly 0 to 91% across our study sites. No disease developed on plants inoculated with Pav through wounding while leaf scar inoculations produced only mild disease symptoms. Based on our results and the previously reported correlation between pedo-climatic conditions and hazelnut decline, we conclude that hazelnut decline in central Italy could be incited by a combination of predisposing (adverse pedo-climatic conditions) and contributing factors (Pav). Because this is a true decline different from “bacterial canker” described in Greece, we refer to it as hazelnut decline (HD).
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Affiliation(s)
- Jay Ram Lamichhane
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- Hazelnut Research Center, Viterbo, Italy
- INRA, UAR 1240 Eco-Innov, BP 01, Thiverval-Grignon, France
- * E-mail:
| | - Claudia Bartoli
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, Castanet-Tolosan, France
- CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, Castanet-Tolosan, France
| | - Leonardo Varvaro
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- Hazelnut Research Center, Viterbo, Italy
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17
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Michelini L, Meggio F, Reichel R, Thiele-Bruhn S, Pitacco A, Scattolin L, Montecchio L, Alberghini S, Squartini A, Ghisi R. Sulfadiazine uptake and effects in common hazel (Corylus avellana L.). Environ Sci Pollut Res Int 2015; 22:13362-13371. [PMID: 25940473 DOI: 10.1007/s11356-015-4560-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 04/16/2015] [Indexed: 06/04/2023]
Abstract
Soil contamination by antibiotics is a possible consequence of animal husbandry waste, sewage sludge, and reclaimed water spreading in agriculture. In this study, 1-year-old hazel plants (Corylus avellana L.) were grown in pots for 64 days in soil spiked with sulfadiazine (SDZ) in the range 0.01-100 mg kg(-1) soil. Leaf gas exchanges, fluorescence parameters and plant growth were measured regularly during the experiment, whereas plant biomass, sulfonamide concentrations in soil and plant tissues, and the quantitative variation of culturable bacterial endophytes in leaf petiole were analyzed at the end of the trial. During the experiment, photosynthesis and leaf transpiration as well as fluorescence parameters were progressively reduced by the antibiotic. Effects were more evident for leaf transpiration and for the highest SDZ spiking concentrations, whereas growth analyses did not reveal negative effects of the antibiotic. At the end of the trial, a high number of culturable endophytic bacteria in the leaf petiole of plants treated with 0.1 and 0.01 mg kg(-1) were observed, and SDZ was extractable from soil and plant roots for spiking concentrations ≥1 mg kg(-1). Inside plants, the antibiotic was mainly stored at the root level with bioconcentration factors increasing with the spiking dose, and the hydroxylated derivate 4-OH-SDZ was the only metabolite detected. Overall results show that 1-year-old hazel plants can contribute to the reduction of sulfonamide concentrations in the environment, however, sensitive reactions to SDZ can be expected at the highest contamination levels.
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Affiliation(s)
- Lucia Michelini
- Department of Agronomy, Food, Natural Resources, Animals, Environment (DAFNAE), University of Padova, Agripolis, viale dell'Università 16, 35020, Legnaro, Padova, Italy
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18
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Marcelletti S, Scortichini M. Comparative Genomic Analyses of Multiple Pseudomonas Strains Infecting Corylus avellana Trees Reveal the Occurrence of Two Genetic Clusters with Both Common and Distinctive Virulence and Fitness Traits. PLoS One 2015; 10:e0131112. [PMID: 26147218 PMCID: PMC4492584 DOI: 10.1371/journal.pone.0131112] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 05/28/2015] [Indexed: 01/26/2023] Open
Abstract
The European hazelnut (Corylus avellana) is threatened in Europe by several pseudomonads which cause symptoms ranging from twig dieback to tree death. A comparison of the draft genomes of nine Pseudomonas strains isolated from symptomatic C. avellana trees was performed to identify common and distinctive genomic traits. The thorough assessment of genetic relationships among the strains revealed two clearly distinct clusters: P. avellanae and P. syringae. The latter including the pathovars avellanae, coryli and syringae. Between these two clusters, no recombination event was found. A genomic island of approximately 20 kb, containing the hrp/hrc type III secretion system gene cluster, was found to be present without any genomic difference in all nine pseudomonads. The type III secretion system effector repertoires were remarkably different in the two groups, with P. avellanae showing a higher number of effectors. Homologue genes of the antimetabolite mangotoxin and ice nucleation activity clusters were found solely in all P. syringae pathovar strains, whereas the siderophore yersiniabactin was only present in P. avellanae. All nine strains have genes coding for pectic enzymes and sucrose metabolism. By contrast, they do not have genes coding for indolacetic acid and anti-insect toxin. Collectively, this study reveals that genomically different Pseudomonas can converge on the same host plant by suppressing the host defence mechanisms with the use of different virulence weapons. The integration into their genomes of a horizontally acquired genomic island could play a fundamental role in their evolution, perhaps giving them the ability to exploit new ecological niches.
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Affiliation(s)
- Simone Marcelletti
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (C.R.A.)-Centro di Ricerca per la Frutticoltura, Via di Fioranello 52, I-00134, Roma, Italy
| | - Marco Scortichini
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (C.R.A.)-Centro di Ricerca per la Frutticoltura, Via di Fioranello 52, I-00134, Roma, Italy
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (C.R.A.)-Unità di Ricerca per la Frutticoltura, Via Torrino 3, I-81100, Caserta, Italy
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Lamichhane JR, Fabi A, Varvaro L. Summer heat and low soil organic matter influence severity of hazelnut Cytospora canker. Phytopathology 2014; 104:387-395. [PMID: 24168042 DOI: 10.1094/phyto-05-13-0136-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Cytospora canker, caused by the fungus Cytospora corylicola, is present in hazelnut production areas worldwide. The disease is widespread throughout the main production areas of Italy. The causal agent is considered to be a secondary invader of damaged tissue that attacks mainly stressed plants. However, little is known of disease severity and stress factors that predispose plants to infection. In particular, the role of pedoclimatic factors was investigated. Direct survey indicated that disease severity varied across several study sites. Geostatistics showed a strong positive correlation between disease severity index and summer heat (r = 0.80 and 0.91 for July and August, respectively) and strong negative correlation between disease severity index and soil organic matter (r = -0.78). A moderate positive correlation between disease severity index and magnesium/potassium ratio (r = 0.58) and moderate negative correlations between disease severity index and total soil nitrogen (r = -0.53), thermal shock (r = -0.46), and rainfall (r = -0.53) were determined. No significant correlation between disease severity index and soil aluminum (r = -0.35), soil pH (r = -0.01), and plant age (r = -0.38) was found.
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Zarivi O, Bonfigli A, Colafarina S, Aimola P, Ragnelli AM, Miranda M, Pacioni G. Transcriptional, biochemical and histochemical investigation on laccase expression during Tuber melanosporum Vittad. development. Phytochemistry 2013; 87:23-29. [PMID: 23276677 DOI: 10.1016/j.phytochem.2012.11.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 11/23/2012] [Accepted: 11/26/2012] [Indexed: 06/01/2023]
Abstract
The cDNAs of Tuber melanosporum laccases (Tmellcc1 and Tmellcc2) have been cloned. From the cloned cDNAs probes were prepared to investigate the expression levels of the Tmellcc1 and Tmellcc2 genes in the free living mycelium (FLM), ectomycorrhizae (ECM) and different developmental stages of fruit body (FB) by quantitative PCR (qPCR). The mRNA expression levels agree with the changes of laccase activities. The histochemical data agree with the qPCR and biochemical results. The highest laccase expression occurs in the ECM, when the host plant roots are invaded by the fungal mycelium.
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Affiliation(s)
- Osvaldo Zarivi
- Department of Life, Health & Environmental Sciences, University of L'Aquila, I 67010 Coppito-L'Aquila, Italy
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Lamichhane JR, Fabi A, Ridolfi R, Varvaro L. Epidemiological study of hazelnut bacterial blight in central Italy by using laboratory analysis and geostatistics. PLoS One 2013; 8:e56298. [PMID: 23424654 PMCID: PMC3570417 DOI: 10.1371/journal.pone.0056298] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Accepted: 01/08/2013] [Indexed: 11/18/2022] Open
Abstract
Incidence of Xanthomonas arboricola pv. corylina, the causal agent of hazelnut bacterial blight, was analyzed spatially in relation to the pedoclimatic factors. Hazelnut grown in twelve municipalities situated in the province of Viterbo, central Italy was studied. A consistent number of bacterial isolates were obtained from the infected tissues of hazelnut collected in three years (2010-2012). The isolates, characterized by phenotypic tests, did not show any difference among them. Spatial patterns of pedoclimatic data, analyzed by geostatistics showed a strong positive correlation of disease incidence with higher values of rainfall, thermal shock and soil nitrogen; a weak positive correlation with soil aluminium content and a strong negative correlation with the values of Mg/K ratio. No correlation of the disease incidence was found with soil pH. Disease incidence ranged from very low (<1%) to very high (almost 75%) across the orchards. Young plants (4-year old) were the most affected by the disease confirming a weak negative correlation of the disease incidence with plant age. Plant cultivars did not show any difference in susceptibility to the pathogen. Possible role of climate change on the epidemiology of the disease is discussed. Improved management practices are recommended for effective control of the disease.
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Affiliation(s)
- Jay Ram Lamichhane
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- Hazelnut Research Center, Viterbo, Italy
| | - Alfredo Fabi
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- Hazelnut Research Center, Viterbo, Italy
| | - Roberto Ridolfi
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
| | - Leonardo Varvaro
- Department of Science and Technology for Agriculture, Forestry, Nature and Energy (DAFNE), Tuscia University, Viterbo, Italy
- Hazelnut Research Center, Viterbo, Italy
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Guerin-Laguette A, Cummings N, Hesom-Williams N, Butler R, Wang Y. Mycorrhiza analyses in New Zealand truffières reveal frequent but variable persistence of Tuber melanosporum in co-existence with other truffle species. Mycorrhiza 2013; 23:87-98. [PMID: 22752459 DOI: 10.1007/s00572-012-0450-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 06/11/2012] [Indexed: 06/01/2023]
Abstract
This study compiles the results from an examination of mycorrhizae on root samples from Tuber melanosporum truffières in New Zealand. Samples were taken over 5 years from 328 trees in 43 truffières established with nursery-inoculated trees. Mycorrhizae were analysed using a combination of morphological and molecular techniques, focusing on the identification of Tuber species. Results show that 49% of the trees, and nearly 90% of the truffières, retained T. melanosporum mycorrhizae up to 21 years after planting. Tuber mycorrhizae with spiky cystidia were found on 26.9% of the tested trees: Tuber brumale (5.5%), Tuber maculatum (10.7%), and unidentified Tuber species (10.7%), and were detected in 67% of the truffières tested. T. brumale was found in 28% and T. maculatum in 35% of the truffières. In 56% of the truffières, T. melanosporum was found to occur with spiky Tuber species. The existence of T. brumale and T. maculatum in the same truffière was recorded only once. Forty-four percent of trees examined had Scleroderma-like (SCL) mycorrhizae and 50% of trees hosted other ectomycorrhizal species (OE). For all categories of mycorrhizal species examined, the variation between truffières was greater than variation within each truffière. Overall results indicate that Corylus avellana tends to be more receptive to mycorrhizae of Tuber species than Quercus robur but is not necessarily more productive. In productive truffières, Q. robur appears to host SCL mycorrhizae more often than C. avellana. This is the first study of its scale to analyse the mycorrhizal species associated with T. melanosporum truffières in the Southern Hemisphere.
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Affiliation(s)
- Alexis Guerin-Laguette
- The New Zealand Institute for Plant & Food Research Limited, Gerald Street, Lincoln, Private Bag 4704, Christchurch 8140, New Zealand.
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Çöpür Y, Tozluoglu A, Özkan M. Evaluating pretreatment techniques for converting hazelnut husks to bioethanol. Bioresour Technol 2013; 129:182-190. [PMID: 23246759 DOI: 10.1016/j.biortech.2012.11.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 11/09/2012] [Accepted: 11/10/2012] [Indexed: 06/01/2023]
Abstract
This study examined the suitability of husk waste for bioethanol production and compared pretreatment techniques with regard to their efficiencies. Results showed that 4% NaBH4 (90 min) delignified the highest amount of lignin (49.1%) from the structure. The highest xylan solubility (77.9%) was observed when samples were treated with 4% NaOH for 90 min. Pretreatment with NaOH and NaBH4, compared to H2O2 and H2SO4, resulted in selective delignification. The highest glucan to glucose conversion (74.4%) and the highest ethanol yield (52.6 g/kg husks) were observed for samples treated with 2% NaOH for 90 min.
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Affiliation(s)
- Yalçın Çöpür
- Düzce Üniversitesi Orman Fakültesi, Orman Endüstri Mühendisliği Bölümü, Konuralp Yerleşkesi, 81000 Düzce, Turkey.
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24
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Benucci GMN, Gógán Csorbai A, Baciarelli Falini L, Bencivenga M, Di Massimo G, Donnini D. Mycorrhization of Quercus robur L., Quercus cerris L. and Corylus avellana L. seedlings with Tuber macrosporum Vittad. Mycorrhiza 2012; 22:639-646. [PMID: 22565651 DOI: 10.1007/s00572-012-0441-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Accepted: 04/18/2012] [Indexed: 05/31/2023]
Abstract
Tuber macrosporum Vittad. is not a common truffle species, but with remarkable organoleptic qualities and much economic interest. After the addition of truffle spore slurry, 30 seedlings of Quercus robur L., Quercus cerris L. and Corylus avellana L. were grown inside a greenhouse for 11 months before evaluation of the mycorrhizal level. Two different potting mixes were used: a natural soil-based potting mix for Q. robur, Q. cerris and C. avellana and a peat-based potting mix for Q. robur. Quercus robur planted in soil potting mix was the most receptive towards the truffle spore inoculum, with a level of formation of T. macrosporum ectomycorrhizas (ECMs) of approximately 14 %, ranging from a minimum of ∼4 % to a maximum of ∼44 % in different seedlings. No T. macrosporum ECMs developed on Q. cerris (soil potting mix) or on Q. robur (peat potting mix), whereas a low percentage of ECMs was detected on only three C. avellana (soil potting mix) seedlings. The fungus Sphaerosporella brunnea (Alb. & Schwein.) Svrček & Kubička was also detected as a contaminant on almost half the truffle-inoculated seedlings. A new detailed description of the morphological and anatomical characteristics of T. macrosporum ECMs and their DNA-based verification with species-specific markers were also reported.
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O’Brien HE, Thakur S, Gong Y, Fung P, Zhang J, Yuan L, Wang PW, Yong C, Scortichini M, Guttman DS. Extensive remodeling of the Pseudomonas syringae pv. avellanae type III secretome associated with two independent host shifts onto hazelnut. BMC Microbiol 2012; 12:141. [PMID: 22800299 PMCID: PMC3411506 DOI: 10.1186/1471-2180-12-141] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Accepted: 07/16/2012] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Hazelnut (Corylus avellana) decline disease in Greece and Italy is caused by the convergent evolution of two distantly related lineages of Pseudomonas syringae pv. avellanae (Pav). We sequenced the genomes of three Pav isolates to determine if their convergent virulence phenotype had a common genetic basis due to either genetic exchange between lineages or parallel evolution. RESULTS We found little evidence for horizontal transfer (recombination) of genes between Pav lineages, but two large genomic islands (GIs) have been recently acquired by one of the lineages. Evolutionary analyses of the genes encoding type III secreted effectors (T3SEs) that are translocated into host cells and are important for both suppressing and eliciting defense responses show that the two Pav lineages have dramatically different T3SE profiles, with only two shared putatively functional T3SEs. One Pav lineage has undergone unprecedented secretome remodeling, including the acquisition of eleven new T3SEs and the loss or pseudogenization of 15, including five of the six core T3SE families that are present in the other Pav lineage. Molecular dating indicates that divergence within both of the Pav lineages predates their observation in the field. This suggest that both Pav lineages have been cryptically infecting hazelnut trees or wild relatives for many years, and that the emergence of hazelnut decline in the 1970s may have been due to changes in agricultural practice. CONCLUSIONS These data show that divergent lineages of P. syringae can converge on identical disease etiology on the same host plant using different virulence mechanisms and that dramatic shifts in the arsenal of T3SEs can accompany disease emergence.
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Affiliation(s)
- Heath E O’Brien
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Shalabh Thakur
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Yunchen Gong
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Pauline Fung
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Jianfeng Zhang
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Lijie Yuan
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Pauline W Wang
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Choseung Yong
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
| | - Marco Scortichini
- C.R.A.- Fruit Crops Research Centre, Via di Fioranello, 52; I-00134, Rome, Italy
| | - David S Guttman
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
- Center for the Analysis of Genome Evolution & Function, University of Toronto, 25 Willcocks St., Toronto, ON, M5S 3B2, Canada
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Vitale S, Santori A, Wajnberg E, Castagnone-Sereno P, Luongo L, Belisario A. Morphological and molecular analysis of Fusarium lateritium, the cause of gray necrosis of hazelnut fruit in Italy. Phytopathology 2011; 101:679-686. [PMID: 21261470 DOI: 10.1094/phyto-04-10-0120] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fusarium lateritium is a globally distributed plant pathogen. It was recently reported as the causal agent of nut gray necrosis (NGN) on hazelnut. Isolate characterization within F. lateritium was undertaken to investigate how morphological and molecular diversity was associated with host and geographic origin. Morphological studies combined with inter-simple-sequence repeat (ISSR) analysis, and phylogenetic analyses using translation elongation factor 1α (TEF-1α), β-tubulin genes, and nuclear ribosomal DNA internal transcribed spacer (ITS) sequences were conducted to resolve relationships among 32 F. lateritium isolates from NGN-affected hazelnut fruit, and 14 from other substrates or 8 from other hosts than hazelnut. Colonies of F. lateritium from hazelnut showed dark grayish-olive differing from the orange-yellow color of all other isolates from other hosts. Generally, isolates from NGN-affected fruit failed to produce sporodochia on carnation leaf agar. The influence of host and substrate on the genetic structure of F. lateritium was supported by ISSR and analyzed with principal coordinates analysis. A relationship between hazelnut and genetic variation was inferred. Phylogenetic analysis of ITS provided limited resolution while TEF-1α and β-tubulin analyses allowed a clear separation between the European and non-European F. lateritium isolates retrieved from GenBank, regardless of host. Though morphological traits of F. lateritium isolates from hazelnut were generally uniform in defining a typical morphogroup, they were not yet phylogenetically defined. In contrast, the typology related to slimy deep orange cultures, due to spore mass, grouped clearly separated from the other F. lateritium isolates and revealed a congruence between morphology and phylogeny.
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Affiliation(s)
- S Vitale
- CRA-PAV Centro di Ricerca per la Patologia Vegetale, Via C. G. Bertero 22, 00156 Roma, Italy
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Abstract
Pseudomonas syringae pv. avellanae (synonym: P. avellanae, Pav) is the causal agent of hazelnut decline in Greece and Italy. The population structure and evolutionary relationships of 22 strains from these two countries were examined by multilocus sequence typing (MLST) of four housekeeping genes (gapA, gltA, gyrB and rpoD). Neighbour-joining and maximum-likelihood phylogenetic analysis revealed that Greek strains isolated from the original 1976 outbreak of hazelnut decline through 1990 were very similar to Italian strains isolated from 2002 through 2004. Other Italian strains that were isolated during the 1990s were very homogeneous and clustered in a clade that was quite distinct from the Greek isolates and Italian isolates from the 2000s. A split decomposition analysis found evidence for recombination between these two highly divergent clades in two of the four MLST housekeeping genes. Incorporating these data into a broad MLST analysis of the P. syringae species complex showed that the Pav Greek and Italian strains from the 2000s clustered with P. syringae phylogroup 1, which is predominantly composed of pathogens of tomato and Brassicaceae hosts, while the Pav Italian strains from the 1990s clustered in P. syringae phylogroup 2 and are most closely related to pea (Pisum sativum L.) pathogens. These results clearly indicate that the ability to infect hazelnuts has arisen twice. This evolutionary process may be due to de novo adaptation to hazelnut by local P. syringae strains (such as the colonizers of Leguminosae crops), or the result of genetic exchange from the original Greek Pav clonal group into a phylogroup 2 strain. The latter explanation is intriguing since there is no exchange of hazelnut propagative material between Italy and Greece, which would be a likely vector for the movement of these pathogens.
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Affiliation(s)
- Pauline W Wang
- Department of Cell and Systems Biology, University of Toronto, Toronto, Canada
| | - Robyn L Morgan
- Department of Cell and Systems Biology, University of Toronto, Toronto, Canada
| | - Marco Scortichini
- CRA Istituto Sperimentale per la Frutticoltura, Via di Fioranello 52, Roma, Italy
| | - David S Guttman
- University of Toronto Centre for the Analysis of Genome Evolution and Function, Toronto, Ontario M5S 3B2, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, Canada
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28
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Hong SG, Maccaroni M, Figuli PJ, Pryor BM, Belisario A. Polyphasic classification of Alternaria isolated from hazelnut and walnut fruit in Europe. ACTA ACUST UNITED AC 2006; 110:1290-300. [PMID: 17077026 DOI: 10.1016/j.mycres.2006.08.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2005] [Revised: 05/15/2006] [Accepted: 08/12/2006] [Indexed: 10/24/2022]
Abstract
Brown apical necrosis of English walnut and grey necrosis of hazelnut are destructive fruit diseases caused by a complex of opportunistic fungi including several small-spored catenulate Alternaria taxa. Thirty Alternaria isolates recovered from walnut and hazelnut fruit that were pathogenic on their respective host were compared along with type or representative isolates of A. alternata, A. tenuissima, A. arborescens, and A. infectoria using morphological and molecular criteria. Morphological examination using standardized procedures separated the walnut and hazelnut isolates into three morphological groups: the A. alternata group, the A. tenuissima group, and the A. arborescens group based upon common characteristics of the conidium and the sporulation apparatus. To evaluate genetic relationships among these groups, AFLP markers, inter simple sequence repeat (ISSR) markers, and histone gene sequence data were compared. Based upon AFLP data, the A. alternata and A. tenuissima groups comprised a single lineage, and the A. arborescens group comprised a separate lineage. ISSR data supported the grouping by AFLP data except for three isolates of the A. alternata group that clustered with the A. arborescens group. Base substitution of the H4 gene supported the discrimination of the A. arborescens group from the A. alternata and A. tenuissima groups. Tests of hypotheses based upon groupings derived from the various data sets supported the discrimination of the A. arborescens group but did not support the discrimination of the A. alternata group from the A. tenuissima group.
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Affiliation(s)
- Soon Gyu Hong
- Division of Plant Pathology, Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA
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Stchigel AM, Cano J, Miller AN, Calduch M, Guarro J. Corylomyces: a new genus of Sordariales from plant debris in France. ACTA ACUST UNITED AC 2006; 110:1361-8. [PMID: 17071066 DOI: 10.1016/j.mycres.2006.08.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Revised: 07/25/2006] [Accepted: 08/12/2006] [Indexed: 11/22/2022]
Abstract
The new genus Corylomyces, isolated from the surface of a hazelnut (Corylus avellana) in the French Pyrenees, is described, illustrated and compared with morphologically similar taxa. It is characterised by tomentose, ostiolate ascomata possessing long necks composed of erect to sinuose hairs, and one- or two-celled, opaque, lunate to reniform ascospores. Analyses of the SSU and LSU fragments rDNA gene sequences support its placement in the Lasiosphaeriaceae (Sordariales).
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MESH Headings
- Corylus/microbiology
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/genetics
- France
- Microscopy, Electron, Transmission
- Molecular Sequence Data
- Phylogeny
- RNA, Ribosomal, 18S/genetics
- RNA, Ribosomal, 28S/genetics
- Sordariales/classification
- Sordariales/cytology
- Sordariales/genetics
- Spores, Fungal/cytology
- Spores, Fungal/genetics
- Spores, Fungal/ultrastructure
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Affiliation(s)
- Alberto M Stchigel
- Unitat de Microbiologia, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili, C/Sant Llorenç 21, 43201 Reus, Spain.
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