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Vohník M, Bruzone MC, Knoblochová T, Fernández NV, Kolaříková Z, Větrovský T, Fontenla SB. Exploring structural and molecular diversity of Ericaceae hair root mycobionts: a comparison between Northern Bohemia and Argentine Patagonia. Mycorrhiza 2023; 33:425-447. [PMID: 37792114 DOI: 10.1007/s00572-023-01125-5] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 08/29/2023] [Indexed: 10/05/2023]
Abstract
Core Ericaceae produce delicate hair roots with inflated rhizodermal cells that host plethora of fungal symbionts. These poorly known mycobionts include various endophytes, parasites, saprobes, and the ericoid mycorrhizal (ErM) fungi (ErMF) that form the ErM symbiosis crucial for the fitness of their hosts. Using microscopy and high-throughput sequencing, we investigated their structural and molecular diversity in 14 different host × site combinations in Northern Bohemia (Central Europe) and Argentine Patagonia (South America). While we found typical ericoid mycorrhiza in all combinations, we did not detect ectomycorrhiza and arbuscular mycorrhiza. Superficial mantles of various thickness formed by non-clamped hyphae were observed in all combinations except Calluna vulgaris from N. Bohemia. Some samples contained frequent intercellular hyphae while others possessed previously unreported intracellular haustoria-like structures linked with intracellular hyphal coils. The 711 detected fungal OTU were dominated by Ascomycota (563) and Basidiomycota (119), followed by four other phyla. Ascomycetes comprised Helotiales (255), Pleosporales (53), Chaetothyriales (42), and other 19 orders, while basidiomycetes Sebacinales (42), Agaricales (28), Auriculariales (7), and other 14 orders. While many dominant OTU from both hemispheres lacked close relatives in reference databases, many were very similar to identical to unnamed sequences from around the world. On the other hand, several significant ericaceous mycobionts were absent in our dataset, incl. Cairneyella, Gamarada, Kurtia, Lachnum, and Leohumicola. Most of the detected OTU could not be reliably linked to a particular trophic mode, and only two could be reliably assigned to the archetypal ErMF Hyaloscypha hepaticicola. Probable ErMF comprised Hyaloscypha variabilis and Oidiodendron maius, both detected only in N. Bohemia. Possible ErMF comprised sebacinoid fungi and several unnamed members of Hyaloscypha s. str. While H. hepaticicola was dominant only in C. vulgaris, this model ErM host lacked O. maius and sebacinoid mycobionts. Hyaloscypha hepaticicola was absent in two and very rare in six combinations from Patagonia. Nine OTU represented dark septate endophytes from the Phialocephala fortinii s. lat.-Acephala applanata species complex, including the most abundant OTU (the only detected in all combinations). Statistical analyses revealed marked differences between N. Bohemia and Patagonia, but also within Patagonia, due to the unique community detected in a Valdivian temperate rainforest. Our results show that the ericaceous hair roots may host diverse mycobionts with mostly unknown functions and indicate that many novel ErMF lineages await discovery. Transhemispheric differences (thousands of km) in their communities may be evenly matched by local differences (scales of km, m, and less).
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Affiliation(s)
- Martin Vohník
- Department of Mycorrhizal Symbioses, Institute of Botany, Czech Academy of Sciences, Průhonice, Czechia.
| | - M Clara Bruzone
- Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche, IPATEC (Universidad Nacional del Comahue-CONICET), San Carlos de Bariloche, Río Negro, Argentina
| | - Tereza Knoblochová
- Department of Mycorrhizal Symbioses, Institute of Botany, Czech Academy of Sciences, Průhonice, Czechia
| | - Natalia V Fernández
- Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche, IPATEC (Universidad Nacional del Comahue-CONICET), San Carlos de Bariloche, Río Negro, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Zuzana Kolaříková
- Department of Mycorrhizal Symbioses, Institute of Botany, Czech Academy of Sciences, Průhonice, Czechia
| | - Tomáš Větrovský
- Laboratory of Environmental Microbiology, Institute of Microbiology, Czech Academy of Sciences, Prague, Czechia
| | - Sonia B Fontenla
- Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche, IPATEC (Universidad Nacional del Comahue-CONICET), San Carlos de Bariloche, Río Negro, Argentina
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Casarrubia S, Martino E, Daghino S, Kohler A, Morin E, Khouja HR, Murat C, Barry KW, Lindquist EA, Martin FM, Perotto S. Modulation of Plant and Fungal Gene Expression Upon Cd Exposure and Symbiosis in Ericoid Mycorrhizal Vaccinium myrtillus. Front Microbiol 2020; 11:341. [PMID: 32210940 PMCID: PMC7075258 DOI: 10.3389/fmicb.2020.00341] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/17/2020] [Indexed: 01/09/2023] Open
Abstract
The success of Ericaceae in stressful habitats enriched in heavy metals has been ascribed to the distinctive abilities of their mycorrhizal fungal partners to withstand heavy metal stress and to enhance metal tolerance in the host plant. Whereas heavy metal tolerance has been extensively investigated in some ericoid mycorrhizal (ERM) fungi, the molecular and cellular mechanisms that extend tolerance to the host plant are currently unknown. Here, we show a reduced Cd content in Cd-exposed mycorrhizal roots of Vaccinium myrtillus colonized by a metal tolerant isolate of the fungus Oidiodendron maius as compared to non-mycorrhizal roots. To better understand this phenotype, we applied Next Generation Sequencing technologies to analyze gene expression in V. myrtillus and O. maius Zn grown under normal and Cd-stressed conditions, in the free living and in the mycorrhizal status. The results clearly showed that Cd had a stronger impact on plant gene expression than symbiosis, whereas fungal gene expression was mainly regulated by symbiosis. The higher abundance of transcripts coding for stress related proteins in non-mycorrhizal roots may be related to the higher Cd content. Regulated plant metal transporters have been identified that may play a role in reducing Cd content in mycorrhizal roots exposed to this metal.
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Affiliation(s)
- Salvatore Casarrubia
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Elena Martino
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
- Université de Lorraine, INRAE, UMR Interactions Arbres/Microorganismes, Centre INRAE Grand Est Nancy, Champenoux, France
| | - Stefania Daghino
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Annegret Kohler
- Université de Lorraine, INRAE, UMR Interactions Arbres/Microorganismes, Centre INRAE Grand Est Nancy, Champenoux, France
| | - Emmanuelle Morin
- Université de Lorraine, INRAE, UMR Interactions Arbres/Microorganismes, Centre INRAE Grand Est Nancy, Champenoux, France
| | | | - Claude Murat
- Université de Lorraine, INRAE, UMR Interactions Arbres/Microorganismes, Centre INRAE Grand Est Nancy, Champenoux, France
| | - Kerrie W. Barry
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Erika A. Lindquist
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Francis M. Martin
- Université de Lorraine, INRAE, UMR Interactions Arbres/Microorganismes, Centre INRAE Grand Est Nancy, Champenoux, France
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
| | - Silvia Perotto
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
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Casarrubia S, Daghino S, Kohler A, Morin E, Khouja HR, Daguerre Y, Veneault-Fourrey C, Martin FM, Perotto S, Martino E. The Hydrophobin-Like OmSSP1 May Be an Effector in the Ericoid Mycorrhizal Symbiosis. Front Plant Sci 2018; 9:546. [PMID: 29765384 PMCID: PMC5938622 DOI: 10.3389/fpls.2018.00546] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
Mutualistic and pathogenic plant-colonizing fungi use effector molecules to manipulate the host cell metabolism to allow plant tissue invasion. Some small secreted proteins (SSPs) have been identified as fungal effectors in both ectomycorrhizal and arbuscular mycorrhizal fungi, but it is currently unknown whether SSPs also play a role as effectors in other mycorrhizal associations. Ericoid mycorrhiza is a specific endomycorrhizal type that involves symbiotic fungi mostly belonging to the Leotiomycetes (Ascomycetes) and plants in the family Ericaceae. Genomic and RNASeq data from the ericoid mycorrhizal fungus Oidiodendron maius led to the identification of several symbiosis-upregulated genes encoding putative SSPs. OmSSP1, the most highly symbiosis up-regulated SSP, was found to share some features with fungal hydrophobins, even though it lacks the Pfam hydrophobin domain. Sequence alignment with other hydrophobins and hydrophobin-like fungal proteins placed OmSSP1 within Class I hydrophobins. However, the predicted features of OmSSP1 may suggest a distinct type of hydrophobin-like proteins. The presence of a predicted signal peptide and a yeast-based signal sequence trap assay demonstrate that OmSSP1 is secreted. OmSSP1 null-mutants showed a reduced capacity to form ericoid mycorrhiza with Vaccinium myrtillus roots, suggesting a role as effectors in the ericoid mycorrhizal interaction.
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Affiliation(s)
- Salvatore Casarrubia
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Stefania Daghino
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Annegret Kohler
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
| | - Emmanuelle Morin
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
| | | | - Yohann Daguerre
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
| | - Claire Veneault-Fourrey
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
- Université de Lorraine, UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Faculté des Sciences et Technologies, Vandoeuvre les Nancy, France
| | - Francis M. Martin
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
| | - Silvia Perotto
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Elena Martino
- Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
- INRA (Institut National de la Recherche Agronomique), UMR 1136 INRA-Université de Lorraine Interactions Arbres/Microorganismes, Laboratoire d'Excellence ARBRE, Centre INRA-Lorraine, Champenoux, France
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Wei X, Chen J, Zhang C, Pan D. A New Oidiodendron maius Strain Isolated from Rhododendron fortunei and its Effects on Nitrogen Uptake and Plant Growth. Front Microbiol 2016; 7:1327. [PMID: 27602030 PMCID: PMC4993752 DOI: 10.3389/fmicb.2016.01327] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 08/11/2016] [Indexed: 12/21/2022] Open
Abstract
A new mycorrhizal fungal strain was isolated from hair roots of Rhododendron fortunei Lindl. grown in Huading Forest Park, Zhejiang Province, China. Morphological characterization and internal transcribed spacer rDNA analysis suggested that it belongs to Oidiodendron maius Barron, and we designated it as strain Om19. Methods for culturing Om19 were established, and the ability of Om19 to form mycorrhizae on R. fortunei was evaluated in a peat-based substrate. Microscopic observations showed hyaline hyphae on the surface of hair roots and crowded hyphal complexes (hyphal coils) inside root cortical cells of R. fortunei after inoculation, indicating that the roots were well colonized by Om19. In a second experiment, fresh and dry weight of R. fortunei 2 months after Om19 inoculation were greater than uninoculated plants, and the total nitrogen absorbed by plants inoculated with Om19 was greater than the uninoculated controls. qRT-PCR analysis of five genes related to N uptake and metabolism (two nitrate transporters, an ammonium transporter, glutamine synthetase, and glutamate synthase) showed that these genes were highly upregulated with twofold to ninefold greater expression in plants inoculated with Om19 compared to uninoculated plants. In the third experiment, Om19 was inoculated into the peat-based substrate for growing Formosa azalea (Rhododendron indica 'Formosa'). 'Formosa' azalea plants grown in the inoculated substrate had larger canopies and root systems compared to uninoculated plants. Our results show that Om19 could be an important microbial tool for improving production of Rhododendron plants.
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Affiliation(s)
- Xiangying Wei
- College of Horticulture, Fujian Agriculture and Forestry UniversityFuzhou, China; Department of Environmental Horticulrture and Mid-Florida Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, ApopkaFL, USA
| | - Jianjun Chen
- College of Horticulture, Fujian Agriculture and Forestry UniversityFuzhou, China; Department of Environmental Horticulrture and Mid-Florida Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, ApopkaFL, USA
| | - Chunying Zhang
- Shanghai Academy of Landscape Architecture Science and Planning Shanghai, China
| | - Dongming Pan
- College of Horticulture, Fujian Agriculture and Forestry University Fuzhou, China
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Fiorilli V, Belmondo S, Khouja HR, Abbà S, Faccio A, Daghino S, Lanfranco L. RiPEIP1, a gene from the arbuscular mycorrhizal fungus Rhizophagus irregularis, is preferentially expressed in planta and may be involved in root colonization. Mycorrhiza 2016; 26:609-621. [PMID: 27075897 DOI: 10.1007/s00572-016-0697-0] [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: 01/12/2016] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
Transcriptomics and genomics data recently obtained from the arbuscular mycorrhizal (AM) fungus Rhizophagus irregularis have offered new opportunities to decipher the contribution of the fungal partner to the establishment of the symbiotic association. The large number of genes which do not show similarity to known proteins witnesses the uniqueness of this group of plant-associated fungi. In this work, we characterize a gene that was called RiPEIP1 (Preferentially Expressed In Planta). Its expression is strongly induced in the intraradical phase, including arbuscules, and follows the expression profile of the Medicago truncatula phosphate transporter MtPT4, a molecular marker of a functional symbiosis. Indeed, mtpt4 mutant plants, which exhibit low mycorrhizal colonization and an accelerated arbuscule turnover, also show a reduced RiPEIP1 mRNA abundance. To further characterize RiPEIP1, in the absence of genetic transformation protocols for AM fungi, we took advantage of two different fungal heterologous systems. When expressed as a GFP fusion in yeast cells, RiPEIP1 localizes in the endomembrane system, in particular to the endoplasmic reticulum, which is consistent with the in silico prediction of four transmembrane domains. We then generated RiPEIP1-expressing strains of the fungus Oidiodendron maius, ericoid endomycorrhizal fungus for which transformation protocols are available. Roots of Vaccinium myrtillus colonized by RiPEIP1-expressing transgenic strains showed a higher mycorrhization level compared to roots colonized by the O. maius wild-type strain, suggesting that RiPEIP1 may regulate the root colonization process.
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Affiliation(s)
- Valentina Fiorilli
- Department of Life Science and Systems Biology, University of Torino, via Accademia Albertina 13, 10123, Torino, Italy.
| | - Simone Belmondo
- Department of Life Science and Systems Biology, University of Torino, via Accademia Albertina 13, 10123, Torino, Italy
| | - Hassine Radhouane Khouja
- Department of Life Science and Systems Biology, University of Torino, via Accademia Albertina 13, 10123, Torino, Italy
| | - Simona Abbà
- Institute for Sustainable Plant Protection (IPSP), CNR, Strada delle Cacce 73, 10135, Torino, Italy
| | - Antonella Faccio
- Institute for Sustainable Plant Protection (IPSP), CNR, Strada delle Cacce 73, 10135, Torino, Italy
| | - Stefania Daghino
- Department of Life Science and Systems Biology, University of Torino, via Accademia Albertina 13, 10123, Torino, Italy
| | - Luisa Lanfranco
- Department of Life Science and Systems Biology, University of Torino, via Accademia Albertina 13, 10123, Torino, Italy
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Lacourt I, Girlanda M, Perotto S, Del Pero M, Zuccon D, Luppi AM. Nuclear ribosomal sequence analysis of Oidiodendron: towards a redefinition of ecologically relevant species. New Phytol 2001; 149:565-576. [PMID: 33873341 DOI: 10.1046/j.1469-8137.2001.00058.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
• Nuclear ribosomal sequence analysis was performed to investigate delimitation of common Oidiodendron species comprising endomycorrhizal symbionts and close associates of ectomycorrhizal plants. • Neighbour-joining, maximum likelihood and parsimony analyses were used to compare 35 ribosomal DNA (internal transcribed spacer (ITS) and 5.8S) sequences (including sequences available in databases) from 15 putative species. • Oidiodendron citrinum formed a monophyletic group nested within O. maius, whereas O. tenuissimum and O. griseum did not appear either as distinct groups or as a single complex. Pairwise nucleotide divergence values between O. citrinum and O. maius were very low and comparable to intraspecific values obtained for both species; values for O. griseum and O. tenuissimum, although higher, overlapped those observed at the intraspecific level for the two species. • Molecular data indicate that O. maius and O. citrinum, which were described as distinct, though related species, could be moved to a subspecific level; however, the delimitation of O. griseum and O. tenuissimum is still open to question. Taxonomic rank assignment to groups determined from sequence data analysis is discussed.
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Affiliation(s)
- Isabelle Lacourt
- Dipartimento di Biologia Vegetale, Viale Mattioli 25, 10125 Torino, Italy
- I. Lacourt and M. Girlanda contributed equally to this paper
| | - Mariangela Girlanda
- Dipartimento di Biologia Vegetale, Viale Mattioli 25, 10125 Torino, Italy
- I. Lacourt and M. Girlanda contributed equally to this paper
| | - Silvia Perotto
- Dipartimento di Biologia Vegetale, Viale Mattioli 25, 10125 Torino, Italy
| | - Massimiliano Del Pero
- Dipartimento di Biologia Animale e dell'Uomo,Via Accademia Albertina 17, 10123 Torino, Italy
| | - Dario Zuccon
- Dipartimento di Biologia Animale e dell'Uomo,Via Accademia Albertina 17, 10123 Torino, Italy
| | - Anna Maria Luppi
- Dipartimento di Biologia Vegetale, Viale Mattioli 25, 10125 Torino, Italy
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