Acclimation to temperature and temperature sensitivity of metabolism by ectomycorrhizal fungi

Malcolm, Glenna M.; López-Gutiérrez, Juan C.; Eissenstat, David M.

doi:10.1111/j.1365-2486.2008.01555.x

Cited by 104 publications

(84 citation statements)

References 59 publications

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“…Since the respiration activity of C. geophilum ectomycorrhizae has been reported to be significantly less altered than that of Lactarius sp., C. geophilum was suggested to better maintain the physiological integrity of beech roots facing drought stress (Jany et al 2002). In contrast, under high temperatures, a decreased colonization with C. geophilum has been detected in Quercus myrsinaefolia (Kasai et al 2000), agreeing with the observation of its reduced respiration under increasing temperature (Malcolm et al 2008). In any case, C. geophilum being a hydrophilic and short-distance exploration fungus has been suggested as a potential indicator of environmental changes (reviewed by Lehto and Zwiazek 2011).…”

Section: Fagaceae Mycorrhization In a Mediterraneanmentioning

confidence: 65%

Mycorrhization of Fagaceae Forests Within Mediterranean Ecosystems

Reis

Tavares

Baptista

et al. 2017

Mycorrhiza - Function, Diversity, State of the Art

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Mediterranean Fagaceae forests are valuable due to their ecological and socioeconomic aspects. Some profitable plant species, such as Castanea (timber and chestnut), Quercus (timber and cork), and Fagus (timber), encounter in this habitat the excellent edaphoclimatic conditions to develop. All Fagaceae plants are commonly associated to ECM fungal species, which are found in these forests in quite stable communities, mainly enriched in Russulaceae and Telephoraceae species. Currently, the Mediterranean Basin is considered as one of the global biodiversity hotspots, since many of their endemic plant species are not found elsewhere and are now under threat. Due to climate changing and introduction of disease agents, Fagaceae forests are facing an adaptation challenge to both biotic and abiotic threats. Although ECM communities are highly disturbed by climate factors and tree disease incidence, they could play an important role in increasing water availability to the plant and also improving plant tree defense against pathogens. Recent advances, namely, on genomics and transcriptomics, are providing tools for increasing the understanding of Fagaceae mycorrhization process and stress responses to biotic and abiotic stresses. Such studies can provide new information for the implementation of the most adequate management policies for protecting threaten Mediterranean forests.

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Section: Fagaceae Mycorrhization In a Mediterraneanmentioning

confidence: 65%

Mycorrhization of Fagaceae Forests Within Mediterranean Ecosystems

Reis

Tavares

Baptista

et al. 2017

Mycorrhiza - Function, Diversity, State of the Art

View full text Add to dashboard Cite

show abstract

“…However, they can also exist in separation from their host trees and gain carbon by heterotrophic decomposition of plant litter and soil organic matter (Nehls 2008;Treseder et al 2007;Malcolm et al 2008). Genome analysis revealed that almost the whole suite of genes for saprophytic enzymes was present in Laccaria bicolor, a typical EM fungus of the basidiomycetes (Martin et al 2008).…”

Section: Introductionmentioning

confidence: 97%

“…Baath and Wallander (2003), Hawkes et al (2008), andMalcom et al (2008) reported increased respiration of EM as a response to increased temperatures. However, some species show a fast temperature acclimation and reduce respiration after days or weeks (Heinemeyer et al 2007;Malcolm et al 2008). In consequence, this would lead to a C accumulation in hyphae when C is still supplied at higher rate to the fungus.…”

Section: Introductionmentioning

confidence: 98%

Simulating mycorrhiza contribution to forest C- and N cycling-the MYCOFON model

et al. 2009

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Although mycorrhiza has been identified to be of major importance for plant nutrition and ecosystem stability, existing C-and N-simulation models on the ecosystem scale do not explicitly consider the feedbacks between ectomycorrhizal fungi and plants. We present a simple dynamic feedback model which allows estimating the main C-and Nflows between ectomycorrhizal fungi and tree roots in order to test the sensitivity of the system fungus-tree to environmental parameters and to assess the fungal contribution to plant N nutrition. Sensitivity tests carried out showed that the model responses to variations of model parameters, particularly with regard to N availability, are in agreement with published results from field and laboratory studies. However, there are still some processes and parameters which are not well constrained. Fungal N uptake rates and the ratio between mycelium, hartig net, and mantle biomass are parameters which significantly affect model results but for which published data are scarce or missing. Nevertheless, the model is already providing a platform to test our understanding of the importance of mycorrhiza for forest stand nutrition. Future coupling to a mechanistic ecosystem model will allow simulating the importance of mycorrhization for e.g. stand growth and C and N retention.

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“…Recent evidence from empirical studies suggests that microbial abundance and community composition are highly sensitive to environmental changes, such as warming, N addition, and altered precipitation (Allison and Martiny 2008;Hawkes et al 2011). Furthermore, microbial communities may shift in composition, adapt physiologically, or evolve in response to new conditions, such as warmer temperatures, thereby limiting the decomposition response to climate change Malcolm et al 2008;Andrews et al 2000;Lipson and Schmidt 2004). Although the importance of these biological responses may vary across systems, current biogeochemical models do not account for them at all.…”

Section: Challenges With Current Modelsmentioning

confidence: 96%

“…As a result, microbes are expected to mediate decomposition responses to global changes, such as climate warming (Bardgett et al 2008). Changing climatic conditions will affect the physiology of microbial communities, which may lead to changes in the rates of biogeochemical processes under microbial control Malcolm et al 2008). It is therefore essential to account for the response of microbial communities to environmental parameters in order to predict feedbacks between global change and decomposition processes.…”

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confidence: 99%

A framework for representing microbial decomposition in coupled climate models

et al. 2011

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Accurate prediction of future atmospheric CO 2 concentrations is essential for evaluating climate change impacts on ecosystems and human societies. One major source of uncertainty in model predictions is the extent to which global warming will increase atmospheric CO 2 concentrations through enhanced microbial decomposition of soil organic carbon. Recent advances in microbial ecology could help reduce this uncertainty, but current global models do not represent direct microbial control over decomposition. Instead, all of the coupled climate models reviewed in the most recent Intergovernmental Panel on Climate Change (IPCC) report assume that decomposition is a first-order decay process, proportional to the size of the soil carbon pool. Here we argue for the development of a new generation of models that link decomposition directly to the size and activity of microbial communities in coupled global models. This process begins with the formulation and validation of fine-scale models that capture fundamental microbial mechanisms without excessive mathematical complexity. These mechanistic models must then be scaled up through an aggregation process and validated at ecosystem to global scales prior to incorporation into global climate models (GCMs). Parameterizing microbial models at the global scale is challenging because some microbial properties such as in situ extracellular enzyme activities are very difficult to measure directly. New parameter fitting procedures may therefore be needed to infer the values of important microbial variables. Validating decomposition models at the global scale is also a challenge, and has not yet been accomplished with the land carbon models embedded in current GCMs. Fortunately new global datasets on soil carbon stocks and fluxes offer promising opportunities to validate both existing land carbon models and new microbial models. If challenges in scaling, parameterization, and validation can be overcome, a new generation of microbially-based decomposition models could substantially improve predictions of carbon-climate feedbacks in the Earth system. Development of new models structures would also reduce any bias due to the assumption of first-order decomposition across all of the models currently referenced in reports of the IPCC.

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Acclimation to temperature and temperature sensitivity of metabolism by ectomycorrhizal fungi

Cited by 104 publications

References 59 publications

Mycorrhization of Fagaceae Forests Within Mediterranean Ecosystems

Mycorrhization of Fagaceae Forests Within Mediterranean Ecosystems

Simulating mycorrhiza contribution to forest C- and N cycling-the MYCOFON model

A framework for representing microbial decomposition in coupled climate models

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