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Fransson P, Robertson AHJ, Campbell CD. Carbon availability affects already large species-specific differences in chemical composition of ectomycorrhizal fungal mycelia in pure culture. MYCORRHIZA 2023; 33:303-319. [PMID: 37824023 PMCID: PMC10752919 DOI: 10.1007/s00572-023-01128-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 09/27/2023] [Indexed: 10/13/2023]
Abstract
Although ectomycorrhizal (ECM) contribution to soil organic matter processes receives increased attention, little is known about fundamental differences in chemical composition among species, and how that may be affected by carbon (C) availability. Here, we study how 16 species (incl. 19 isolates) grown in pure culture at three different C:N ratios (10:1, 20:1, and 40:1) vary in chemical structure, using Fourier transform infrared (FTIR) spectroscopy. We hypothesized that C availability impacts directly on chemical composition, expecting increased C availability to lead to more carbohydrates and less proteins in the mycelia. There were strong and significant effects of ECM species (R2 = 0.873 and P = 0.001) and large species-specific differences in chemical composition. Chemical composition also changed significantly with C availability, and increased C led to more polysaccharides and less proteins for many species, but not all. Understanding how chemical composition change with altered C availability is a first step towards understanding their role in organic matter accumulation and decomposition.
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Affiliation(s)
- Petra Fransson
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, PO Box 7026, SE-750 07, Uppsala, Sweden.
| | - A H Jean Robertson
- The James Hutton Institute, Craigiebuckler, Aberdeen, AB15 8QH, Scotland
| | - Colin D Campbell
- The James Hutton Institute, Craigiebuckler, Aberdeen, AB15 8QH, Scotland
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Ianutsevich EA, Danilova OA, Grum-Grzhimaylo OA, Tereshina VM. The Role of Osmolytes and Membrane Lipids in the Adaptation of Acidophilic Fungi. Microorganisms 2023; 11:1733. [PMID: 37512905 PMCID: PMC10383115 DOI: 10.3390/microorganisms11071733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/11/2023] [Accepted: 06/28/2023] [Indexed: 07/30/2023] Open
Abstract
Acidophiles maintain near-neutral intracellular pH using proton pumps. We have suggested the protective role of osmolytes and membrane lipids in the adaptation to an acidic environment. Previously we have observed, for the first time, high levels of trehalose in acidophilic basidiomycete Sistotrema brinkmannii. Here, we have studied the composition of both osmolytes and membrane lipids of two more acidophilic fungi. Trehalose and polyols were among the main osmolytes during growth under optimal conditions (pH 4.0) in basidiomycete Phlebiopsis gigantea and ascomycete Mollisia sp. Phosphatidic acids, phosphatidylethanolamines, phosphatidylcholines, and sterols, were predominant membrane lipids in both fungi. P. gigantea had a narrow optimum of growth at pH 4.0, resulting in a sharp decline of growth rate at pH 2.6 and 5.0, accompanied by a decrease in the number of osmolytes and significant changes in the composition of membrane lipids. In contrast, Mollisia sp. had a broad optimal growth range (pH 3.0-5.0), and the number of osmolytes either stayed the same (at pH 6.0) or increased (at pH 2.6), while membrane lipids composition remained unchanged. Thus, the data obtained indicate the participation of osmolytes and membrane lipids in the adaptation of acidophilic fungi.
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Affiliation(s)
- Elena A Ianutsevich
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., 119071 Moscow, Russia
| | - Olga A Danilova
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., 119071 Moscow, Russia
| | - Olga A Grum-Grzhimaylo
- White Sea Biological Station, Faculty of Biology, Lomonosov Moscow State University, 1-12 Leninskie Gory, 119234 Moscow, Russia
- Laboratory of Genetics, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Vera M Tereshina
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., 119071 Moscow, Russia
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3
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Ianutsevich EA, Danilova OA, Antropova AB, Tereshina VM. Acquired thermotolerance, membrane lipids and osmolytes profiles of xerohalophilic fungus Aspergillus penicillioides under heat shock. Fungal Biol 2023; 127:909-917. [PMID: 36906381 DOI: 10.1016/j.funbio.2023.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 01/08/2023] [Accepted: 01/16/2023] [Indexed: 01/23/2023]
Abstract
Xerophilic fungi accumulate a large amount of glycerol in the cytosol to counterbalance the external osmotic pressure. But during heat shock (HS) majority of fungi accumulate a thermoprotective osmolyte trehalose. Since glycerol and trehalose are synthesized in the cell from the same precursor (glucose), we hypothesised that, under heat shock conditions, xerophiles growing in media with high concentrations of glycerol may acquire greater thermotolerance than those grown in media with high concentrations of NaCl. Therefore, the composition of membrane lipids and osmolytes of the fungus Aspergillus penicillioides, growing in 2 different media under HS conditions was studied and the acquired thermotolerance was assessed. It was found that in the salt-containing medium an increase in the proportion of phosphatidic acids against a decrease in the proportion of phosphatidylethanolamines is observed in the composition of membrane lipids, and the level of glycerol in the cytosol decreases 6-fold, while in the medium with glycerol, changes in the composition of membrane lipids are insignificant and the level of glycerol is reduced by no more than 30%. In the mycelium trehalose level have increased in both media, but did not exceed 1% of dry weight. However, after exposure to HS the fungus acquires greater thermotolerance in the medium with glycerol than in the medium with salt. The data obtained indicate the interrelation between changes in the composition of osmolytes and membrane lipids in the adaptive response to HS, as well as the synergistic effect of glycerol and trehalose.
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Affiliation(s)
- Elena A Ianutsevich
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave, 119071, Moscow, Russian Federation.
| | - Olga A Danilova
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave, 119071, Moscow, Russian Federation.
| | - Anna B Antropova
- Federal State Budgetary Scientific Institution «I. Mechnikov Research Institute of Vaccines and Sera», 5А, Malyy Kazennyy Pereulok, 105064, Moscow, Russian Federation.
| | - Vera M Tereshina
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave, 119071, Moscow, Russian Federation.
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Boosting Sustainable Agriculture by Arbuscular Mycorrhiza under Stress Condition: Mechanism and Future Prospective. BIOMED RESEARCH INTERNATIONAL 2022; 2022:5275449. [PMID: 36619307 PMCID: PMC9815931 DOI: 10.1155/2022/5275449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 12/13/2022] [Accepted: 12/21/2022] [Indexed: 12/31/2022]
Abstract
Global agriculture is frequently subjected to stresses from increased salt content, drought, heavy metals, and other factors, which limit plant growth and production, deteriorate soil health, and constitute a severe danger to global food security. Development of environmentally acceptable mitigation techniques against stresses and restrictions on the use of chemical fertilizers in agricultural fields is essential. Therefore, eco-friendly practises must be kept to prevent the detrimental impacts of stress on agricultural regions. The advanced metabolic machinery needed to handle this issue is not now existent in plants to deal against the stresses. Research has shown that the key role and mechanisms of arbuscular mycorrhiza fungi (AMF) to enhance plant nutrient uptake, immobilisation and translocation of heavy metals, and plant growth-promoting attributes may be suitable agents for plant growth under diversed stressed condition. The successful symbiosis and the functional relationship between the plant and AMF may build the protective regulatory mechansm against the key challenge in particular stress. AMF's compatibility with hyperaccumulator plants has also been supported by studies on gene regulation and theoretical arguments. In order to address this account, the present review included reducing the impacts of biotic and abiotic stress through AMF, the mechanisms of AMF to improve the host plant's capacity to endure stress, and the strategies employed by AM fungus to support plant survival in stressful conditions.
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Ponert J, Šoch J, Vosolsobě S, Čiháková K, Lipavská H. Integrative Study Supports the Role of Trehalose in Carbon Transfer From Fungi to Mycotrophic Orchid. FRONTIERS IN PLANT SCIENCE 2021; 12:793876. [PMID: 34956293 PMCID: PMC8695678 DOI: 10.3389/fpls.2021.793876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 11/15/2021] [Indexed: 05/08/2023]
Abstract
Orchids rely on mycorrhizal symbiosis, especially in the stage of mycoheterotrophic protocorms, which depend on carbon and energy supply from fungi. The transfer of carbon from fungi to orchids is well-documented, but the identity of compounds ensuring this transfer remains elusive. Some evidence has been obtained for the role of amino acids, but there is also vague and neglected evidence for the role of soluble carbohydrates, probably trehalose, which is an abundant fungal carbohydrate. We therefore focused on the possible role of trehalose in carbon and energy transfer. We investigated the common marsh orchid (Dactylorhiza majalis) and its symbiotic fungus Ceratobasidium sp. using a combination of cultivation approaches, high-performance liquid chromatography, application of a specific inhibitor of the enzyme trehalase, and histochemical localization of trehalase activity. We found that axenically grown orchid protocorms possess an efficient, trehalase-dependent, metabolic pathway for utilizing exogenous trehalose, which can be as good a source of carbon and energy as their major endogenous soluble carbohydrates. This is in contrast to non-orchid plants that cannot utilize trehalose to such an extent. In symbiotically grown protocorms and roots of adult orchids, trehalase activity was tightly colocalized with mycorrhizal structures indicating its pronounced role in the mycorrhizal interface. Inhibition of trehalase activity arrested the growth of both symbiotically grown protocorms and trehalose-supported axenic protocorms. Since trehalose constitutes only an inconsiderable part of the endogenous saccharide spectrum of orchids, degradation of fungal trehalose likely takes place in orchid mycorrhiza. Our results strongly support the neglected view of the fungal trehalose, or the glucose produced by its cleavage as compounds transported from fungi to orchids to ensure carbon and energy flow. Therefore, we suggest that not only amino acids, but also soluble carbohydrates are transported. We may propose that the soluble carbohydrates would be a better source of energy for plant metabolism than amino acids, which is partially supported by our finding of the essential role of trehalase.
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Affiliation(s)
- Jan Ponert
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Prague, Czechia
- Prague Botanical Garden, Prague, Czechia
- Institute of Botany, Czech Academy of Sciences, Průhonice, Czechia
| | - Jan Šoch
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Prague, Czechia
| | - Stanislav Vosolsobě
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Prague, Czechia
| | - Klára Čiháková
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Prague, Czechia
| | - Helena Lipavská
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Prague, Czechia
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Danilova OA, Ianutsevich EA, Bondarenko SA, Georgieva ML, Vikchizhanina DA, Groza NV, Bilanenko EN, Tereshina VM. Osmolytes and membrane lipids in the adaptation of micromycete Emericellopsis alkalina to ambient pH and sodium chloride. Fungal Biol 2020; 124:884-891. [DOI: 10.1016/j.funbio.2020.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 11/28/2022]
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7
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Pisani O, Haddix ML, Conant RT, Paul EA, Simpson MJ. Molecular composition of soil organic matter with land-use change along a bi-continental mean annual temperature gradient. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 573:470-480. [PMID: 27572539 DOI: 10.1016/j.scitotenv.2016.08.154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 08/12/2016] [Accepted: 08/21/2016] [Indexed: 06/06/2023]
Abstract
Soil organic matter (SOM) is critical for maintaining soil fertility and long-term agricultural sustainability. The molecular composition of SOM is likely altered due to global climate and land-use change; but rarely are these two aspects studied in tandem. Here we used molecular-level techniques to examine SOM composition along a bi-continental (from North to South America) mean annual temperature (MAT) gradient from seven native grassland/forest and cultivated/pasture sites. Biomarker methods included solvent extraction, base hydrolysis and cupric (II) oxide oxidation for the analysis of free lipids of plant and microbial origin, ester-bound lipids from cutin and suberin, and lignin-derived phenols, respectively. Solid-state 13C nuclear magnetic resonance (NMR) was used to examine the overall composition of SOM. Soil cultivation was found to increase the amount of microbial-derived compounds at warmer temperatures (up to 17% increase). The cultivated soils were characterized by much lower contributions of plant-derived SOM components compared to the native soils (up to 64% lower at the coldest site). In addition, cultivation caused an increase in lignin and cutin degradation (up to 68 and 15% increase, respectively), and an increase in the amount of suberin-derived inputs (up to 54% increase). Clear differences in the molecular composition of SOM due to soil cultivation were observed in soils of varying mineral composition and were attributed to disturbance, different vegetation inputs, soil aggregate destruction and MAT. A high organic allophanic tropical soil was characterized by its protection of carbohydrates and nitrogen-containing compounds. The conversion of native to cultivated land shows significant shifts in the degradation stage of SOM. In particular, cutin-derived compounds which are believed to be part of the stable SOM pool may undergo enhanced degradation with long-term cultivation and disruption of soil aggregates. On a per year basis, the total amount of cutin decreased only at the two forest sites that were converted to pasture, likely due to cutin degradation or to changes in vegetation and litter quality associated with land-use change. Overall, our study highlights that the implementation of different agricultural management practices enhances the degradation of recalcitrant SOM compounds that may become a source of atmospheric CO2 with increasing land-use and climate change.
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Affiliation(s)
- Oliva Pisani
- Environmental NMR Centre, Department of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Michelle L Haddix
- Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
| | - Richard T Conant
- Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
| | - Eldor A Paul
- Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
| | - Myrna J Simpson
- Environmental NMR Centre, Department of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, ON M1C 1A4, Canada.
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Meena M, Prasad V, Zehra A, Gupta VK, Upadhyay RS. Mannitol metabolism during pathogenic fungal-host interactions under stressed conditions. Front Microbiol 2015; 6:1019. [PMID: 26441941 PMCID: PMC4585237 DOI: 10.3389/fmicb.2015.01019] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 09/08/2015] [Indexed: 12/03/2022] Open
Abstract
Numerous plants and fungi produce mannitol, which may serve as an osmolyte or metabolic store; furthermore, mannitol also acts as a powerful quencher of reactive oxygen species (ROS). Some phytopathogenic fungi use mannitol to stifle ROS-mediated plant resistance. Mannitol is essential in pathogenesis to balance cell reinforcements produced by both plants and animals. Mannitol likewise serves as a source of reducing power, managing coenzymes, and controlling cytoplasmic pH by going about as a sink or hotspot for protons. The metabolic pathways for mannitol biosynthesis and catabolism have been characterized in filamentous fungi by direct diminishment of fructose-6-phosphate into mannitol-1-phosphate including a mannitol-1-phosphate phosphatase catalyst. In plants mannitol is integrated from mannose-6-phosphate to mannitol-1-phosphate, which then dephosphorylates to mannitol. The enzyme mannitol dehydrogenase plays a key role in host–pathogen interactions and must be co-localized with pathogen-secreted mannitol to resist the infection.
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Affiliation(s)
- Mukesh Meena
- Department of Botany, Banaras Hindu University Varanasi, India
| | - Vishal Prasad
- Institute of Environment and Sustainable Development, Banaras Hindu University Varanasi, India
| | - Andleeb Zehra
- Department of Botany, Banaras Hindu University Varanasi, India
| | - Vijai K Gupta
- Molecular Glycobiotechnology Group, Discipline of Biochemistry, School of Natural Sciences, National University of Ireland Galway Galway, Ireland
| | - Ram S Upadhyay
- Department of Botany, Banaras Hindu University Varanasi, India
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Vieira V, Barros L, Martins A, Ferreira ICFR. Expanding current knowledge on the chemical composition and antioxidant activity of the genus Lactarius. Molecules 2014; 19:20650-63. [PMID: 25514055 PMCID: PMC6271741 DOI: 10.3390/molecules191220650] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 12/04/2014] [Accepted: 12/04/2014] [Indexed: 11/16/2022] Open
Abstract
Despite the presence of toxic compounds in inedible mushrooms, the question whether the chemical nutrients and non-nutrients compositions in edible and inedible Lactarius species are similar remains unanswered. To answer this question, Lactarius citriolens Pouzar and Lactarius turpis (Weinm.) Fr., two inedible species, were studied in order to obtain information about their chemical composition and bioactivity. Free sugars, fatty acids, tocopherols, organic and phenolic acids were analysed by chromatographic techniques coupled to different detectors. L. citriolens and L. turpis methanolic extracts were tested regarding antioxidant potential (reducing power, radical scavenging activity and lipid peroxidation inhibition). The composition of macronutrients varied among the two species, but the profiles were similar between them and among other Lactarius species; L. citriolens gave the highest energy contribution, saturated fatty acids and organic acids, while the L. turpis sample was richer in free sugars, mono- and polyunsaturated fatty acids, tocopherols and phenolic compounds. L. turpis methanolic extract showed the highest antioxidant activity. The absence of hepatoxicity of the methanolic extracts was confirmed in porcine liver primary cells (in vitro conditions). The present study provided new information about wild L. citriolens and L. turpis, comparing their chemical composition and antioxidant properties with other Lactarius species, and expanding the knowledge about this genus.
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Affiliation(s)
- Vanessa Vieira
- Centro de Investigação de Montanha (CIMO), ESA, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal.
| | - Lillian Barros
- Centro de Investigação de Montanha (CIMO), ESA, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal.
| | - Anabela Martins
- School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, Ap. 1172, 5301-855 Bragança, Portugal.
| | - Isabel C F R Ferreira
- Centro de Investigação de Montanha (CIMO), ESA, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal.
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Kariman K, Barker SJ, Jost R, Finnegan PM, Tibbett M. A novel plant-fungus symbiosis benefits the host without forming mycorrhizal structures. THE NEW PHYTOLOGIST 2014; 201:1413-1422. [PMID: 24279681 DOI: 10.1111/nph.12600] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 10/09/2013] [Indexed: 05/10/2023]
Abstract
• Most terrestrial plants form mutually beneficial symbioses with specific soil-borne fungi known as mycorrhiza. In a typical mycorrhizal association, fungal hyphae colonize plant roots, explore the soil beyond the rhizosphere and provide host plants with nutrients that might be chemically or physically inaccessible to root systems. • Here, we combined nutritional, radioisotopic ((33)P) and genetic approaches to describe a plant growth promoting symbiosis between the basidiomycete fungus Austroboletus occidentalis and jarrah (Eucalyptus marginata), which has quite different characteristics. • We show that the fungal partner does not colonize plant roots; hyphae are localized to the rhizosphere soil and vicinity and consequently do not transfer nutrients located beyond the rhizosphere. Transcript profiling of two high-affinity phosphate (Pi) transporter genes (EmPHT1;1 and EmPHT1;2) and hyphal-mediated (33)Pi uptake suggest that the Pi uptake shifts from an epidermal to a hyphal pathway in ectomycorrhizal plants (Scleroderma sp.), similar to arbuscular mycorrhizal symbioses, whereas A. occidentalis benefits its host indirectly. The enhanced rhizosphere carboxylates are linked to growth and nutritional benefits in the novel symbiosis. • This work is a starting point for detailed mechanistic studies on other basidiomycete-woody plant relationships, where a continuum between heterotrophic rhizosphere fungi and plant beneficial symbioses is likely to exist.
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Affiliation(s)
- Khalil Kariman
- School of Earth and Environment M087, The University of Western Australia, Crawley, WA, 6009, Australia
- School of Plant Biology M084, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Susan J Barker
- School of Plant Biology M084, The University of Western Australia, Crawley, WA, 6009, Australia
- Institute of Agriculture M082, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Ricarda Jost
- School of Plant Biology M084, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Patrick M Finnegan
- School of Plant Biology M084, The University of Western Australia, Crawley, WA, 6009, Australia
- Institute of Agriculture M082, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Mark Tibbett
- School of Earth and Environment M087, The University of Western Australia, Crawley, WA, 6009, Australia
- Department of Environmental Science and Technology (B37), School of Applied Sciences, Cranfield University, Cranfield, Bedfordshire, MK 43 OAL, UK
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Reis FS, Barros L, Calhelha RC, Ćirić A, van Griensven LJ, Soković M, Ferreira IC. The methanolic extract of Cordyceps militaris (L.) Link fruiting body shows antioxidant, antibacterial, antifungal and antihuman tumor cell lines properties. Food Chem Toxicol 2013; 62:91-8. [DOI: 10.1016/j.fct.2013.08.033] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Revised: 08/12/2013] [Accepted: 08/14/2013] [Indexed: 11/16/2022]
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12
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Fernandez CW, Koide RT. The function of melanin in the ectomycorrhizal fungus Cenococcum geophilum under water stress. FUNGAL ECOL 2013. [DOI: 10.1016/j.funeco.2013.08.004] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Reis FS, Ćirić A, Stojković D, Barros L, Ljaljević-Grbić M, Soković M, Ferreira ICFR. Effects of different culture conditions on biological potential and metabolites production in three Penicillium isolates. Drug Dev Ind Pharm 2013; 41:253-62. [PMID: 24261405 DOI: 10.3109/03639045.2013.858738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The genus Penicillium is well known for its importance in drug and food production. Certain species are produced on an industrial scale for the production of antibiotics (e.g. penicillin) or for insertion in food (e.g. cheese). In the present work, three Penicillium species, part of the natural mycobiota growing on various food products were selected - P. ochrochloron, P. funiculosum and P. verrucosum var. cyclopium. The objective of our study was to value these species from the point of view of production of bioactive metabolites. The species were obtained after inoculation and growth in Czapek and Malt media. Both mycelia and culture media were analyzed to monitor the production of different metabolites by each fungus and their release to the culture medium. The concentrations of sugars, organic acids, phenolic acids and tocopherols were determined. Antioxidant activity of the phenolic extracts was evaluated, as also the antimicrobial activity of phenolic acids, organic acids and tocopherols extracts. Rhamnose, xylose, fructose and trehalose were found in all the mycelia and culture media; the prevailing organic acids were oxalic and fumaric acids, and protocatechuic and p-hydroxybenzoic acids were the most common phenolic acids; γ-tocopherol was the most abundant vitamin E isoform. Generally, the phenolic extracts corresponding to the mycelia samples revealed higher antioxidant activity. Concerning the antimicrobial activity there were some fluctuations, however all the studied species revealed activity against the tested strains. Therefore, the in-vitro bioprocesses can be an alternative for the production of bioactive metabolites that can be used by pharmaceutical industry.
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Affiliation(s)
- Filipa S Reis
- Mountain Research Center (CIMO), ESA, Polytechnic Institute of Bragança , Campus de Santa Apolónia, Bragança , Portugal
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Analytical Methods Applied to the Chemical Characterization and Antioxidant Properties of Three Wild Edible Mushroom Species from Northeastern Portugal. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9668-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Heleno SA, Stojković D, Barros L, Glamočlija J, Soković M, Martins A, Queiroz MJR, Ferreira IC. A comparative study of chemical composition, antioxidant and antimicrobial properties of Morchella esculenta (L.) Pers. from Portugal and Serbia. Food Res Int 2013. [DOI: 10.1016/j.foodres.2012.12.020] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Chemical characterization of Agaricus bohusii, antioxidant potential and antifungal preserving properties when incorporated in cream cheese. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.06.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Pavic A, Stankovic S, Marjanovic Z. Biochemical characterization of a sphingomonad isolate from the ascocarp of white truffle (Tuber magnatum Pico). ARCH BIOL SCI 2011. [DOI: 10.2298/abs1103697p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Available information on bacteria that influence the economically important
white truffle (Tuber magnatum Pico) life cycle is scarce. From the ascocarp
of white truffle we isolated a strain TMG 022C, capable for growth in
nitrogendepleted conditions and assimilation of mannitol and trehalose.
According to 16S rDNA sequence phylogeny, the strain was closely related to
Sphingobium amiense. The strain had the ability to perform ammonification,
reduce nitrate and solubilize Ca3(PO4)2, produce chitinase, lipase,
phospholipase and ?-glucanase, but not cellulase, pectinase, protease and
siderophores. The results suggest that Sphingobium sp. TMG 022C could have an
influence on the Tuber magnatum life cycle through improved mycelium
nutrition and ascocarp decomposition.
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Affiliation(s)
- A. Pavic
- Institute for Multidisciplinary Research, Belgrade
| | - S. Stankovic
- Institute of Molecular Genetics and Genetic Engineering, Belgrade
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18
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Ceccaroli P, Saltarelli R, Guescini M, Polidori E, Buffalini M, Menotta M, Pierleoni R, Barbieri E, Stocchi V. Identification and characterization of the Tuber borchii D-mannitol dehydrogenase which defines a new subfamily within the polyol-specific medium chain dehydrogenases. Fungal Genet Biol 2007; 44:965-78. [PMID: 17317242 DOI: 10.1016/j.fgb.2007.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 12/28/2006] [Accepted: 01/04/2007] [Indexed: 10/23/2022]
Abstract
A novel NADP(+)-dependent D-mannitol dehydrogenase and the corresponding gene from the plant symbiotic ascomycete fungus Tuber borchii was identified and characterized. The enzyme, called TbMDH, is a homotetramer with two zinc atoms per subunit. It catalyzed both D-fructose reduction and D-mannitol oxidation, although it showed the highest substrate specificity and catalytic efficiency for D-fructose. Co-factor specificity was restricted to NADP(H) and the reaction proceeded via a sequential ordered Bi Bi mechanism. The carbon responsive transcriptional pattern showed that Tbmdh is up-regulated when mycelia are transferred to a culture medium containing D-mannitol or D-fructose. The phylogenetic analysis showed TbMDH to be the first example of a fungal D-mannitol-2-dehydrogenase belonging to the medium-chain dehydrogenase/reductases (MDRs). The enzyme identified a new group of proteins, most of them annotated in databases as hypothetical zinc-dependent dehydrogenases, forming a distinct subfamily among the polyol dehydrogenase family.
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Affiliation(s)
- Paola Ceccaroli
- Istituto di Chimica Biologica Giorgio Fornaini, Università degli Studi di Urbino Carlo Bo, Via A Saffi 2, 61029, Urbino (PU), Italy.
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19
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Tibbett M, Cairney JW. The cooler side of mycorrhizas: their occurrence and functioning at low temperatures. ACTA ACUST UNITED AC 2007. [DOI: 10.1139/b06-152] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mycorrhizal associations occur in a range of habitats in which soils are subject to low temperature (≤15 °C) for a significant part of the year. Despite this, most of our understanding of mycorrhizal fungi and their interactions with their plant hosts is based on physiological investigations conducted in the range 20–37 °C using fungi of temperate origin. Comparatively little consideration has been given to the cold edaphic conditions in which many mycorrhizas survive and prosper, and the physiological and ecological consequences of their low temperature environments. In this review, we consider the distribution and persistence of arbuscular and ectomycorrhizal mycorrhizal associations in cold environments and highlight progress in understanding adaptations to freezing resistance and nutrient acquisition at low temperature in mycorrhizal fungi.
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Affiliation(s)
- Mark Tibbett
- Centre for Land Rehabilitation, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia
- Centre for Plant and Food Science, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia
| | - John W.G. Cairney
- Centre for Land Rehabilitation, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia
- Centre for Plant and Food Science, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia
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20
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Koide RT, Shumway DL, Xu B, Sharda JN. On temporal partitioning of a community of ectomycorrhizal fungi. THE NEW PHYTOLOGIST 2007; 174:420-429. [PMID: 17388904 DOI: 10.1111/j.1469-8137.2007.02000.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Several mechanisms may contribute to the high species richness often reported in ectomycorrhizal (ECM) fungal communities, including spatial and temporal partitioning. Here, we focus on temporal partitioning. Using molecular methods, we determined the frequencies of occurrence of ECM fungal species detected as hyphae and ECM roots in the forest floor of a Pinus resinosa plantation during a 13-month period. We then used a novel statistical procedure to place the most frequently occurring ECM fungal species into groups distinguished by their patterns of relative frequency over time. Three groups with contrasting temporal patterns were distinguishable for fungal species detected as hyphae. Two groups were distinguishable for species detected as ECM roots. Our results support the hypothesis that temporal partitioning occurs among the species of ECM fungi in this community, but we did not address its causes, which may have involved interactions among species' physiological tolerances, temporal environmental variability, temporal patterns of root production, and variation in fungal genet lifespan. These interactions should be the subjects of future research.
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Affiliation(s)
- Roger T Koide
- Department of Horticulture, The Pennsylvania State University, University Park, PA 16802, USA
- Intercollege Graduate Degree Program in Plant Biology, The Pennsylvania State University, University Park, PA 16802, USA
- Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802, USA
| | - Durland L Shumway
- Department of Statistics, The Pennsylvania State University, University Park, PA 16802, USA
| | - Bing Xu
- Department of Horticulture, The Pennsylvania State University, University Park, PA 16802, USA
| | - Jori N Sharda
- Intercollege Graduate Degree Program in Plant Biology, The Pennsylvania State University, University Park, PA 16802, USA
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21
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Solomon P, Waters O, Jörgens C, Lowe R, Rechberger J, Trengove R, Oliver R. Mannitol is required for asexual sporulation in the wheat pathogen Stagonospora nodorum (glume blotch). Biochem J 2006; 399:231-9. [PMID: 16859492 PMCID: PMC1609904 DOI: 10.1042/bj20060891] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The physiological role of the mannitol cycle in the wheat pathogen Stagonospora nodorum (glume blotch) has been investigated by reverse genetics and metabolite profiling. A putative mannitol 2-dehydrogenase gene (Mdh1) was cloned by degenerate PCR and disrupted. The resulting mutated mdh1 strains lacked all detectable NADPH-dependent mannitol dehydrogenase activity. The mdh1 strains were unaffected for mannitol production but, surprisingly, were still able to utilize mannitol as a sole carbon source, suggesting a hitherto unknown mechanism for mannitol catabolism. The mutant strains were not compromised in their ability to cause disease or sporulate. To further our understanding of mannitol metabolism, a previously developed mannitol-1-phosphate dehydrogenase (gene mpd1) disruption construct [Solomon, Tan and Oliver (2005) Mol. Plant-Microbe Interact. 18, 110-115] was introduced into the mutated mdh1 background, resulting in a strain lacking both enzyme activities. The mpd1mdh1 strains were unable to grow on mannitol and produced only trace levels of mannitol. The double-mutant strains were unable to sporulate in vitro when grown on minimal medium for extended periods. Deficiency in sporulation was correlated with the depletion of intracellular mannitol pools. Significantly sporulation could be restored with the addition of mannitol. Pathogenicity of the double mutant was not compromised, although, like the previously characterized mpd1 mutants, the strains were unable to sporulate in planta. These findings not only question the currently hypothesized pathways of mannitol metabolism, but also identify for the first time that mannitol is required for sporulation of a filamentous fungus.
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Affiliation(s)
- Peter S. Solomon
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
- To whom correspondence should be addressed (email )
| | - Ormonde D. C. Waters
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
| | - Cordula I. Jörgens
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
| | - Rohan G. T. Lowe
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
| | - Judith Rechberger
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
| | - Robert D. Trengove
- †School of Biological Sciences and Biotechnology, Murdoch University, Perth 6150, WA, Australia
- ‡School of Pharmacy, Murdoch University, Perth 6150, WA, Australia
| | - Richard P. Oliver
- *Australian Centre for Necrotrophic Fungal Pathogens, SABC, Division of Health Sciences, Murdoch University, Perth 6150, WA, Australia
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22
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Izumi H, Anderson IC, Alexander IJ, Killham K, Moore ERB. Endobacteria in some ectomycorrhiza of Scots pine (Pinus sylvestris). FEMS Microbiol Ecol 2006; 56:34-43. [PMID: 16542403 DOI: 10.1111/j.1574-6941.2005.00048.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The diversity of cultivable endobacteria associated with four different ectomycorrhizal morphotypes (Suillus flavidus, Suillus variegatus, Russula paludosa and Russula sp.) of Scots pine (Pinus sylvestris) was analysed by restriction fragment length polymorphism profiling of PCR-amplified rDNA intergenic spacer regions and by sequence analyses of 16S rRNA genes. Ectomycorrhizal root tip surface-sterilization methods were developed and assessed for their efficiencies. Bacterial communities from surface-sterilized ectomycorrhizal root tips were different from those of ectomycorrhizal root tips without surface-sterilization for all the morphotypes studied. Endobacteria belonging to the genera Pseudomonas, Burkholderia and Bacillus were isolated from more than one ectomycorrhizal morphotype, whereas species of Rahnella, Janthinobacterium and Rhodococcus were only isolated from the single morphotypes of S. variegatus, R. paludosa and Russula sp., respectively. Some of the isolated endobacteria utilized fungal sugars more readily than typical plant sugars in carbon utilization assays.
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23
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Link T, Lohaus G, Heiser I, Mendgen K, Hahn M, Voegele R. Characterization of a novel NADP(+)-dependent D-arabitol dehydrogenase from the plant pathogen Uromyces fabae. Biochem J 2005; 389:289-95. [PMID: 15796718 PMCID: PMC1175105 DOI: 10.1042/bj20050301] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Revised: 03/24/2005] [Accepted: 03/30/2005] [Indexed: 01/15/2023]
Abstract
We have identified and characterized a novel NADP(+)-dependent D-arabitol dehydrogenase and the corresponding gene from the rust fungus Uromyces fabae, a biotrophic plant pathogen on broad bean (Vicia faba). The new enzyme was termed ARD1p (D-arabitol dehydrogenase 1). It recognizes D-arabitol and mannitol as substrates in the forward reaction, and D-xylulose, D-ribulose and D-fructose as substrates in the reverse reaction. Co-factor specificity was restricted to NADP(H). Kinetic data for the major substrates and co-factors are presented. A detailed analysis of the organization and expression pattern of the ARD1 gene are also given. Immunocytological data indicate a localization of the gene product predominantly in haustoria, the feeding structures of these fungi. Analyses of metabolite levels during pathogenesis indicate that the D-arabitol concentration rises dramatically as infection progresses, and D-arabitol was shown in an in vitro system to be capable of quenching reactive oxygen species involved in host plant defence reactions. ARD1p may therefore play an important role in carbohydrate metabolism and in establishing and/or maintaining the biotrophic interaction in U. fabae.
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Affiliation(s)
- Tobias Link
- *Phytopathologie, Fachbereich Biologie, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
| | - Gertrud Lohaus
- †Biochemie der Pflanzen, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Universität Göttingen, 37077 Göttingen, Germany
| | - Ingrid Heiser
- ‡Phytopathologie, Wissenschaftszentrum Weihenstephan der Technischen Universität München, 85350 Freising-Weihenstephan, Germany
| | - Kurt Mendgen
- *Phytopathologie, Fachbereich Biologie, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
| | - Matthias Hahn
- §Phytopathologie, Fachbereich Biologie, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Ralf T. Voegele
- *Phytopathologie, Fachbereich Biologie, Universität Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
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24
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Buée M, Vairelles D, Garbaye J. Year-round monitoring of diversity and potential metabolic activity of the ectomycorrhizal community in a beech (Fagus silvatica) forest subjected to two thinning regimes. MYCORRHIZA 2005; 15:235-245. [PMID: 15221576 DOI: 10.1007/s00572-004-0313-6] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2003] [Accepted: 05/03/2004] [Indexed: 05/24/2023]
Abstract
This work was aimed at understanding how the functional diversity of ectomycorrhizas (ECM) is driven by environmental factors and how it adapts to the structure of the forest stand. Superficial fine roots were sampled 21 times during an entire year in two adjacent plots (no thinning and strong thinning) of a mature beech (Fagus silvatica) forest. Individual ectomycorrhizal root tips were morphologically characterised and the symbiotic fungi were molecularly identified. ECM were also tested for dehydrogenase and acid phosphatase activities, and soil moisture and temperature were recorded. The results provide a description of ECM community dynamics over a whole year in the two stands. The main conclusions are threefold: (1) the species structure of the ECM community and metabolic activity of each morphotype change depending on the season, temperature and soil moisture, and a number of morphotypes are more abundant and active in winter than in summer, (2) the silviculture treatment (strong thinning) modifies the ectomycorrhizal community structure, and (3) the overall function of the ECM community results from the individual time pattern and specialisation of each morphotype.
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Affiliation(s)
- Marc Buée
- Unité Mixte de Recherche 1136 Interaction Arbres/Micro-organismes, Centre INRA de Nancy, 54280 , Champenoux, France
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25
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Koide RT. Nucleic Acid Isolation from Ecological Samples—Fungal Associations, Mycorrhizae. Methods Enzymol 2005; 395:58-72. [PMID: 15865961 DOI: 10.1016/s0076-6879(05)95005-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Mycorrhizal fungi are among the most common symbioses found in terrestrial ecosystems, both natural and managed. They are important for many reasons, but most notably because of their positive effects on plant growth, which are mediated by their uptake of nutrients from the soil and transport of these to the roots. Moreover, many edible fungi are mycorrhizal. The study of mycorrhizal fungi has been hampered by the inability to identify species and individuals in the soil. This has been greatly aided by DNA-based methods, which first require the extraction of DNA. Herein, I discuss some general concerns that must be considered when extracting and purifying DNA from ecological samples and offer specific methods for soil, mycorrhizal roots, and fruiting bodies. These methods are rapid, safe, effective, relatively inexpensive, and convenient because they are based on commercially available kits.
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Affiliation(s)
- Roger T Koide
- Department of Horticulture, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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26
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Voegele RT, Hahn M, Lohaus G, Link T, Heiser I, Mendgen K. Possible roles for mannitol and mannitol dehydrogenase in the biotrophic plant pathogen Uromyces fabae. PLANT PHYSIOLOGY 2005; 137:190-8. [PMID: 15618426 PMCID: PMC548850 DOI: 10.1104/pp.104.051839] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Revised: 10/11/2004] [Accepted: 10/18/2004] [Indexed: 05/18/2023]
Abstract
Levels of the C6-polyol mannitol were observed to rise dramatically in the biotrophic interaction of the rust fungus Uromyces fabae and its host plant Vicia faba. Mannitol was found in millimolar concentrations in extracts and apoplastic fluids of infected leaves and also in extracts of spores. We suggest that this polyol might have at least a dual function: first, as a carbohydrate storage compound, and second, as a scavenger of reactive oxygen species. Mannitol accumulation is accompanied by high expression of a mannitol dehydrogenase (MAD1) in haustoria. While MAD1 transcripts were detected in haustoria only, immunolocalization studies show that the gene product is also present in spores. Kinetic and thermodynamic analyses of the MAD1p catalyzed reactions indicate that the enzyme might be responsible for the production of mannitol in haustoria and for the utilization of mannitol in spores. Since V. faba is normally unable to synthesize or utilize polyols, the multipurpose usage of mannitol seems an ideal strategy for the fungal pathogen.
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Affiliation(s)
- Ralf T Voegele
- Phytopathologie, Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany.
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27
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Dickie IA, Xu B, Koide RT. Vertical niche differentiation of ectomycorrhizal hyphae in soil as shown by T-RFLP analysis. THE NEW PHYTOLOGIST 2002; 156:527-535. [PMID: 33873568 DOI: 10.1046/j.1469-8137.2002.00535.x] [Citation(s) in RCA: 222] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
• Niche differentiation for different soil substrates has been proposed as a mechanism contributing to ectomycorrhizal fungal diversity. This hypothesis has been largely untestable because of a lack of techniques to study the in situ distribution of ectomycorrhizal hyphae. • We developed a technique involving soil DNA extraction, PCR and terminal restriction fragment length polymorphism (T-RFLP) analysis for species identification to investigate the vertical distribution of fungal hyphae in four distinct layers of the forest floor (lower litter, F-layer, H-layer, and B-horizon) of a Pinus resinosa plantation. • Fungal communities differed markedly among the four layers. Cluster analysis suggested six different patterns of resource utilization: litter-layer specialists, litter-layer generalists, F-layer, H-layer, and B-horizon species, and multilayer generalists. Known ectomycorrhizal species were found in all six clusters. • This spatial partitioning observed among ectomycorrhizal fungi along a single, relatively simple substrate-resource gradient supports the niche differentiation hypothesis as an important mechanism contributing to ectomycorrhizal fungal diversity.
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Affiliation(s)
- Ian A Dickie
- Current address: Department of Forest Resources, University of Minnesota, 115 Green Hall, 1530 N. Cleveland Ave., St. Paul, MN 55108, USA
| | - Bing Xu
- Department of Horticulture, The Pennsylvania State University, University Park, PA 16802 USA
| | - Roger T Koide
- Department of Horticulture, The Pennsylvania State University, University Park, PA 16802 USA
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