Mycorrhizal Fungi in Sensitive Environments

A special issue of Journal of Fungi (ISSN 2309-608X).

Deadline for manuscript submissions: closed (31 March 2015)

Special Issue Editor

Faculty of Science and Technology, Free University of Bolzano-Bozen, piazza Università, 1 - Universitätsplatz 1 I-39100 Bolzano - Bozen, Italy
Interests: mycorrhizal fungi; agroecosystems; nitrogen cycle; carbon cycle; isotopes; tree ecophysiology

Special Issue Information

Dear Colleagues,

Mycorrhizal fungi play a role in many biogeochemical cycles that can be relevant to seek a sustainable agricultural management. This is of interest, especially in those areas of the world particularly sensitive to environmental disruption due to inadequate soil management and to climate change. Mountain areas include many of these sensitive areas, and therefore they require special care to avoid the excessive exploitation of resources, such as water and biodiversity, and to limit environmental pollution due to, for example, nitrogen leaching into waters. This topic is of particular importance because of the many people relying on mountain resources both directly, through crop production and animal farming, and indirectly, for example as consumers of the downstream water. The question we will address is if and how improving and protecting mycorrhizal symbiosis can sustain more environmental friendly agricultural and agroforestry practices and support the protection of sensitive areas. Other aspects that can be addressed are whether (1) mycorrhizal fungi can enhance water and nutrient use efficiency of plants in sensitive environments, hence saving resources and decreasing pollution risks; (2) mycorrhizal fungi can favor the growth of food crops in areas traditionally unsuitable or little suitable to agriculture, hence enhancing the agricultural and agroforestry potential of these areas; and (3) mycorrhizal fungi can serve as proxy of the impact of climate change on sensitive environments, for example in relation to the fluctuations of biodiversity. This special issue of JoF therefore deals with aspects related to the possible contribution of mycorrhizal fungi to relieve environmental burdens such as nitrogen leaching, water shortage and diffusion of plant pests. This special issue should focus specifically on mountain environments although other types of sensitive environments might be taken into account if relevant.

Prof. Dr. Francesca Scandellari
Guest Editor

Prof. Dr. Francesca Scandellari

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Keywords

  • mycorrhizal fungi
  • mountain areas
  • sensitive environments
  • agroforestry and agriculture
  • sustainability
  • plant nutrition
  • water resources protection and exploitation
  • nitrogen
  • soil erosion and stability
  • ecosystem biodiversity

Published Papers (4 papers)

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Editorial

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668 KiB  
Editorial
Special Issue: Mycorrhizal Fungi in Sensitive Environments
by Francesca Scandellari
J. Fungi 2015, 1(2), 168-172; https://doi.org/10.3390/jof1020168 - 10 Aug 2015
Cited by 1 | Viewed by 3832
Abstract
The scope of this special issue is to understand whether and how mycorrhizal symbiosis can be included as an agriculture and agroforestry tool that promotes more environmentally friendly practices, and whether it promotes the protection of sensitive areas. Three papers are included in [...] Read more.
The scope of this special issue is to understand whether and how mycorrhizal symbiosis can be included as an agriculture and agroforestry tool that promotes more environmentally friendly practices, and whether it promotes the protection of sensitive areas. Three papers are included in this special issue, each dealing with a different sensitive environment. These papers present fundamental aspects that should be taken into account when planning or reporting studies related to mycorrhizal fungi in sensitive environments. Full article
(This article belongs to the Special Issue Mycorrhizal Fungi in Sensitive Environments)

Research

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1797 KiB  
Article
Ectomycorrhizal Fungal Communities and Enzymatic Activities Vary across an Ecotone between a Forest and Field
by Megan A. Rúa, Becky Moore, Nicole Hergott, Lily Van, Colin R. Jackson and Jason D. Hoeksema
J. Fungi 2015, 1(2), 185-210; https://doi.org/10.3390/jof1020185 - 28 Aug 2015
Cited by 13 | Viewed by 5268
Abstract
Extracellular enzymes degrade macromolecules into soluble substrates and are important for nutrient cycling in soils, where microorganisms, such as ectomycorrhizal (ECM) fungi, produce these enzymes to obtain nutrients. Ecotones between forests and fields represent intriguing arenas for examining the effect of the environment [...] Read more.
Extracellular enzymes degrade macromolecules into soluble substrates and are important for nutrient cycling in soils, where microorganisms, such as ectomycorrhizal (ECM) fungi, produce these enzymes to obtain nutrients. Ecotones between forests and fields represent intriguing arenas for examining the effect of the environment on ECM community structure and enzyme activity because tree maturity, ECM composition, and environmental variables may all be changing simultaneously. We studied the composition and enzymatic activity of ECM associated with loblolly pine (Pinus taeda) across an ecotone between a forest where P. taeda is established and an old field where P. taeda saplings had been growing for <5 years. ECM community and environmental characteristics influenced enzyme activity in the field, indicating that controls on enzyme activity may be intricately linked to the ECM community, but this was not true in the forest. Members of the Russulaceae were associated with increased phenol oxidase activity and decreased peroxidase activity in the field. Members of the Atheliaceae were particularly susceptible to changes in their abiotic environment, but this did not mediate differences in enzyme activity. These results emphasize the complex nature of factors that dictate the distribution of ECM and activity of their enzymes across a habitat boundary. Full article
(This article belongs to the Special Issue Mycorrhizal Fungi in Sensitive Environments)
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1044 KiB  
Article
Analyses of Sporocarps, Morphotyped Ectomycorrhizae, Environmental ITS and LSU Sequences Identify Common Genera that Occur at a Periglacial Site
by Ari Jumpponen, Shawn P. Brown, James M. Trappe, Efrén Cázares and Rauni Strömmer
J. Fungi 2015, 1(1), 76-93; https://doi.org/10.3390/jof1010076 - 25 May 2015
Cited by 7 | Viewed by 5643
Abstract
Periglacial substrates exposed by retreating glaciers represent extreme and sensitive environments defined by a variety of abiotic stressors that challenge organismal establishment and survival. The simple communities often residing at these sites enable their analyses in depth. We utilized existing data and mined [...] Read more.
Periglacial substrates exposed by retreating glaciers represent extreme and sensitive environments defined by a variety of abiotic stressors that challenge organismal establishment and survival. The simple communities often residing at these sites enable their analyses in depth. We utilized existing data and mined published sporocarp, morphotyped ectomycorrhizae (ECM), as well as environmental sequence data of internal transcribed spacer (ITS) and large subunit (LSU) regions of the ribosomal RNA gene to identify taxa that occur at a glacier forefront in the North Cascades Mountains in Washington State in the USA. The discrete data types consistently identified several common and widely distributed genera, perhaps best exemplified by Inocybe and Laccaria. Although we expected low diversity and richness, our environmental sequence data included 37 ITS and 26 LSU operational taxonomic units (OTUs) that likely form ECM. While environmental surveys of metabarcode markers detected large numbers of targeted ECM taxa, both the fruiting body and the morphotype datasets included genera that were undetected in either of the metabarcode datasets. These included hypogeous (Hymenogaster) and epigeous (Lactarius) taxa, some of which may produce large sporocarps but may possess small and/or spatially patchy genets. We highlight the importance of combining various data types to provide a comprehensive view of a fungal community, even in an environment assumed to host communities of low species richness and diversity. Full article
(This article belongs to the Special Issue Mycorrhizal Fungi in Sensitive Environments)
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984 KiB  
Article
Host-Specialist Dominated Ectomycorrhizal Communities of Pinus cembra are not Affected by Temperature Manipulation
by Georg Rainer, Regina Kuhnert, Mara Unterholzer, Philipp Dresch, Andreas Gruber and Ursula Peintner
J. Fungi 2015, 1(1), 55-75; https://doi.org/10.3390/jof1010055 - 30 Apr 2015
Cited by 15 | Viewed by 6085
Abstract
Ectomycorrhizae (EM) are important for the survival of seedlings and trees, but how they will react to global warming or changes in soil fertility is still in question. We tested the effect of soil temperature manipulation and nitrogen fertilization on EM communities in [...] Read more.
Ectomycorrhizae (EM) are important for the survival of seedlings and trees, but how they will react to global warming or changes in soil fertility is still in question. We tested the effect of soil temperature manipulation and nitrogen fertilization on EM communities in a high-altitude Pinus cembra afforestation. The trees had been inoculated in the 1960s in a nursery with a mixture of Suillus placidus, S. plorans and S. sibircus. Sampling was performed during the third year of temperature manipulation in June and October 2013. Root tips were counted, sorted into morphotypes, and sequenced. Fungal biomass was measured as ergosterol and hyphal length. The EM potential of the soil was assessed with internal transcribed spacers (ITS) clone libraries from in-growth mesh bags (MB). Temperature manipulation of ± 1 °C had no effect on the EM community. A total of 33 operational taxonomic units (OTUs) were identified, 20 from the roots, 13 from MB. The inoculated Suillus spp. colonized 82% of the root tips, thus demonstrating that the inoculation was sustainable. Nitrogen fertilization had no impact on the EM community, but promoted depletion in soil organic matter, and caused a reduction in soil fungal biomass. Full article
(This article belongs to the Special Issue Mycorrhizal Fungi in Sensitive Environments)
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