Ectomycorrhizal fungal communities in Nothofagus nervosa ( Raulí ): A comparison between domesticated and naturally established specimens in a native forest of Patagonia, Argentina

Fernández, Natalia; Marchelli, Paula; Gherghel, Felicia; Kost, Gerhard; Fontenla, Sonia

doi:10.1016/j.funeco.2015.05.011

Cited by 17 publications

(5 citation statements)

References 49 publications

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“…We found that N. pumilio seedling root systems were highly colonized by EMF (∼97% across all the studied treatments). These findings are similar to reports that both young and mature Nothofagus roots have high colonization levels of >70% ( Diehl, Mazzarino & Fontenla, 2008 ; Fernández et al, 2015 ) and reinforce findings from the Northern Hemisphere where inoculum levels in logged areas remain high ( Perry et al, 1982 ; Jones, Durall & Cairney, 2003 ) even when strong differences in fungal composition occur after harvest. Despite overall high colonization levels, mycorrhizal colonization was lowest in DR sites akin to observations of reduced EMF root presence in harvested New Zealand Nothofagus forests ( Dickie, Richardson & Wiser, 2009 ).…”

Section: Discussionsupporting

confidence: 89%

Variable retention harvesting influences belowground plant-fungal interactions of Nothofagus pumilio seedlings in forests of southern Patagonia

Hewitt

Taylor

Hollingsworth

et al. 2018

PeerJ

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BackgroundThe post-harvest recovery and sustained productivity of Nothofagus pumilio forests in Tierra del Fuego may be affected by the abundance and composition of ectomycorrhizal fungi (EMF). Timber harvesting alters EMF community structure in many managed forests, but the impacts of harvesting can vary with the management strategy. The implementation of variable retention (VR) management can maintain, increase, or decrease the diversity of many species, but the effects of VR on EMF in the forests of southern Patagonia have not been studied, nor has the role of EMF in the regeneration process of these forests.MethodsWe evaluated the effects of VR management on the EMF community associated with N. pumilio seedlings. We quantified the abundance, composition, and diversity of EMF across aggregate (AR) and dispersed (DR) retention sites within VR managed areas, and compared them to primary forest (PF) unmanaged stands. EMF assemblage and taxonomic identities were determined by ITS-rDNA sequencing of individual root tips sampled from 280 seedlings across three landscape replicates. To better understand seedling performance, we tested the relationships between EMF colonization, EMF taxonomic composition, seedling biomass, and VR treatment.ResultsThe majority of EMF taxa were Basidiomycota belonging to the families Cortinariaceae (n = 29), Inocybaceae (n = 16), and Thelephoraceae (n = 8), which was in agreement with other studies of EMF diversity in Nothofagus forests. EMF richness and colonization was reduced in DR compared to AR and PF. Furthermore, EMF community composition was similar between AR and PF, but differed from the composition in DR. EMF community composition was correlated with seedling biomass and soil moisture. The presence of Peziza depressa was associated with higher seedling biomass and greater soil moisture, while Inocybe fibrillosibrunnea and Cortinarius amoenus were associated with reduced seedling biomass and lower soil moisture. Seedling biomass was more strongly related to retention type than EMF colonization, richness, or composition.DiscussionOur results demonstrate reduced EMF attributes and altered composition in VR treatments relative to PF stands, with stronger impacts in DR compared to AR. This suggests that VR has the potential to improve the conservation status of managed stands by supporting native EMF in AR. Our results also demonstrate the complex linkages between retention treatments, fungal community composition, and tree growth at individual and stand scales.

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Section: Discussionsupporting

confidence: 89%

Variable retention harvesting influences belowground plant-fungal interactions of Nothofagus pumilio seedlings in forests of southern Patagonia

Hewitt

Taylor

Hollingsworth

et al. 2018

PeerJ

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“…Some of the ECM fungi consumed by S. rubecula and P. tarnii, such as Cystangium nothofagi and species of Cortinarius, Descolea, and Inocybe, are important ECM fungi that colonize the roots of seedlings and saplings of several species of Nothofagaceae. [82][83][84] The results of our viability tests show that nearly half of the fungal spores in fecal samples are able to survive intact after passage through the digestive systems of the birds. It is important to note that not all structurally intact spores are capable of germinating and that our estimates cannot assess the germination rate itself, only the structural integrity of the spores.…”

Section: Discussionmentioning

confidence: 88%

Discovering the role of Patagonian birds in the dispersal of truffles and other mycorrhizal fungi

et al. 2021

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“…Our results from the DGGE analyses showed that variation between the different rhizosphere fungal communities depended mainly on the substrate (tephra or native forest soil) and forest site. Significant differences between substrates or sampling sites were not found for Ascomycetes (Figure 1a of which are Basidiomycetes (Tedersoo et al, 2009, Nouhra et al, 2013, Fernández et al, 2015, and that this symbiosis had been registered in N. pumilio seedlings growing in the tephra, this phenomenon could be attributed to the composition of ectomycorrhizal communities, which would be similar in seedlings growing in tephra (CS1 and CS2) but completely different in those located in native forest soil (CO). This is because a volcanic eruption creates a vast barren desert for primary succession due to the recently deposited tephra, where there are very few or no initial fungal propagules, (Nara et al, 2003;Allen et al, 2005;Yamanaka and Okabe 2006), while in the forest soil there are mature and well-established microbial communities and functional mycorrhizal networks.…”

Section: Discussionmentioning

confidence: 93%

“…Consequently, in terms of research these organisms represent one of the most interesting microbial groups in the soil environment. The fact that in Patagonia several studies are being carried out on mycorrhizas (Fontenla et al, 1998;Fernández et al, 2012;Nouhra et al, 2013;Fernández et al, 2015;Marín et al, 2016) and other soil fungal communities (Mestre et al, 2011;Díaz et al, 2017) reinforces the importance of describing these organisms in natural ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Nothofagus pumilio forest affected by recent tephra deposition in northern Patagonia. II- Shifts in diversity and structure of rhizosphere fungal communities

Fernández

Fontenla

Moguilevsky

et al. 2018

J. Soil Sci. Plant Nutr.

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Volcanic eruptions have a significant effect on ecosystems, including soil and its fungal communities. Due to the eruption of the Puyehue-Cordón Caulle in 2011, thick tephra deposits accumulated in several Nothofagus pumilio forests in Northern Patagonia. The tephra deposition affected plant establishment and development during the post-eruption period. In this work we analyzed rhizosphere fungal communities associated with N. pumilio seedlings at three study sites sampled three years after the eruption, two with a thick tephra layer (50 cm) and a third site with no tephra deposition. Denaturing gradient gel electrophoresis (DGGE) was performed for the different fungal communities (Ascomycetes, Basidiomycetes and Total fungi). We found clear shifts in rhizosphere fungal communities, especially for Basidiomycetes and Total fungi. Site-related characteristics, such as type of substrate, light intensity and the existence of understory and previous mycelial networks, seemed to be the main factors determining the structure of these fungal communities. Given their sensitivity to different types of environmental change, these microbial communities could be used as bioindicators. Specifically, Basidiomycetes and total fungi seem to be better bioindicators of environmental changes than ascomycetes. The results shown here contribute to the understanding of how fungal communities respond to disturbance, an important issue in the evaluation of how ecosystem processes might be affected in areas commonly subjected to geological risks, such as volcanism. This information is also relevant to the planning and successful implementation of restoration activities based on seedling optimization by rhizosphere fungi.

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Ectomycorrhizal fungal communities in Nothofagus nervosa ( Raulí ): A comparison between domesticated and naturally established specimens in a native forest of Patagonia, Argentina

Cited by 17 publications

References 49 publications

Variable retention harvesting influences belowground plant-fungal interactions of Nothofagus pumilio seedlings in forests of southern Patagonia

Variable retention harvesting influences belowground plant-fungal interactions of Nothofagus pumilio seedlings in forests of southern Patagonia

Discovering the role of Patagonian birds in the dispersal of truffles and other mycorrhizal fungi

Nothofagus pumilio forest affected by recent tephra deposition in northern Patagonia. II- Shifts in diversity and structure of rhizosphere fungal communities

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