Response of nitrogen-transforming microorganisms to arbuscular mycorrhizal fungi

Amora-Lazcano, Enriqueta; Vázquez, Manuel; Azcón‐Aguilar, Concepción

doi:10.1007/s003740050401

Cited by 68 publications

(23 citation statements)

References 21 publications

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“…Amora-Lazcano et al (1998) were able to demonstrate a decrease in counts of denitrifying bacteria in the presence of AM fungi. However, their harvesting technique (coring) could have affected carbon availability in the microcosms through severing roots, thus impacting denitrification rates.…”

Section: Evidence For Am Fungal Involvementmentioning

confidence: 90%

“…Amora-Lazcano et al (1998) observed that inoculation of maize with G. mosseae and Glomus fasciculatum facilitated establishment of culturable ammonia oxidizing bacteria in the soil. However, in this study, sequential harvesting of the microcosms revealed that the AO community had not reached equilibrium till the final harvest.…”

Section: Evidence For Am Fungal Involvementmentioning

confidence: 98%

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Arbuscular mycorrhiza and soil nitrogen cycling

Veresoglou

Chen

Rillig

2012

Soil Biology and Biochemistry

290

153

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a b s t r a c tNitrogen is a major nutrient that frequently limits primary productivity in terrestrial ecosystems. Therefore, the physiological responses of plants to soil nitrogen (N) availability have been extensively investigated, and the study of the soil N-cycle has become an important component of ecosystem ecology and biogeochemistry. The bulk of the literature in these areas has, however, overlooked the fact that most plants form mycorrhizal associations, and that nutrient uptake is therefore mediated by mycorrhizal fungi. It is well established that ecto-and ericoid mycorrhizas influence N nutrition of plants, but roles of arbuscular mycorrhizas in N nutrition are less well established; perhaps even more importantly, current conceptual models ignore possible influences of arbuscular mycorrhizal (AM) fungi on N-cycling processes. We review evidence for the interaction between the AM symbiosis with microbes and processes involved in soil N-cycling. We show that to date investigations have rather poorly addressed such interactions and discuss possible reasons for this. We outline mechanisms that could potentially operate with regards to AM fungal e N-cycling interactions, discuss experimental designs aimed at studying these, and conclude by pointing out priorities for future research.

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Section: Evidence For Am Fungal Involvementmentioning

confidence: 90%

Section: Evidence For Am Fungal Involvementmentioning

confidence: 98%

Arbuscular mycorrhiza and soil nitrogen cycling

Veresoglou

Chen

Rillig

2012

Soil Biology and Biochemistry

290

153

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“…In agricultural soils, nitrification is mainly carried out by a few chemoautotrophic bacterial species (Paul and Clark 1996). Amora-Lazcano et al (1998) observed that G. mosseae and G. fasciculatum decreased the populations of ammonifying and denitrifying bacteria, and increased the abundance of autotrophic ammonium oxidizing bacteria in soil growing maize, in the greenhouse. The reason for this change in nitrifying bacteria and the impact of this change on actual nitrification are unknown.…”

Section: Impact Of Arbuscular Mycorrhizal Fungi On Soil Microorganismsmentioning

confidence: 95%

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

Hamel¹

2004

Can. J. Soil. Sci.

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Hamel, C. 2004. Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone. Can. J. Soil Sci. 84: 383-395. The influence of arbuscular mycorrhizal fungi (AMF) on soil processes is difficult to define, in part because it varies with the plant and fungal genotypes as well as with environmental conditions. The influence of AMF on N cycling is just being discovered. This short review examines areas of knowledge related to the nature of the mycorrhizosphere, AMF-microbe interactions, and N and P mobilization in the root zone. The role AMF could play in the root zone in N and P dynamics is presented. The spatial organization of roots and hyphae in soil suggests that AMF may enhance the reabsorption of nutrients lost through root exudation. These fungi influence soil microorganisms and, hence, they may influence biochemical reactions in soil including mineralization of organic matter and nitrification. AMF seem to improve the capacity of their host plant to use organic sources of P and N. AMF might improve the ability of plants to compete with saprotrophs for the uptake of P and N. The impact from this latter effect of AMF could exceed that stemming from their possible direct use of amino-acid-N, their production of phosphatase enzymes and possibly of organic anions. Better competitive ability of mycorrhizal plants under conditions of low soil P and N levels could reduce saprotrophic populations and, if this occurs, regulate soil organic matter turnover rate. The management of biological soil resources, in truly sustainable cropping systems, may be the largest challenge in crop production. Il est difficile d'établir avec précision l'incidence des mycorhizes à arbuscules (MA) sur les processus du sol, parce qu'elle varie, d'une part, avec la plante et le génotype des champignons, mais aussi avec les conditions environnementales. On commence à peine à décou-vrir l'influence des MA sur le cycle de l'azote. Ce court article fait le point sur ce qu'on sait de la nature de la myco-rhizosphère, des interactions entre les MA et les microorganismes et de la mobilisation du N et du P dans la rhizosphère. Suit une description du rôle que les MA pourraient jouer dans la dynamique du N et du P au niveau de la rhizosphère. L'organisation spatiale des racines et des hyphes dans le sol laisse croire que les MA pourraient faciliter la réabsorption des éléments nutritifs que les racines perdent par exsudation. Les champignons influent sur la microflore tellurique, donc pourraient modifier les réactions biochimiques dans le sol, y compris la minéral-isation et la nitrification de la matière organique. Les MA semblent accroître la capacité de la plante hôte à exploiter les sources de P et de N organiques. Ils pourraient aussi amener les plantes à mieux concurrencer les saprophytes pour l'absorption du P et du N. Cette dernière propriété pourrait avoir une plus grande incidence que celle issue de l'utilisation directe éventuelle du N des acides aminés, de la synthèse de phosphatase et peut-être de la libération d'anions or...

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“…Mycorrhizal fungi have provided an opportunity to assess the effects of fungi in soil through exclusion systems and comparisons between colonized and non colonized plants. Amora-Lazcano et al (1998) compared the abundance of denitrifiers, ammonium oxidizers, and ammonifying bacteria between maize plants with and without arbuscular mycorrhizal fungi. The study found that after 30 days the presence of arbuscular mycorrhizal fungi reduced the population size of both bacterial denitrifiers and ammonifying organisms in soil, which may have been driven by the alteration in soil conditions created by the presence of arbuscular mycorrhizal fungi.…”

Section: Organisms Involved In Denitrificationmentioning

confidence: 99%

Soil nitrate reducing processes – drivers, mechanisms for spatial variation, and significance for nitrous oxide production

Giles¹,

Morley²,

Baggs³

et al. 2012

Front. Microbio.

208

127

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The microbial processes of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) are two important nitrate reducing mechanisms in soil, which are responsible for the loss of nitrate (NO3−) and production of the potent greenhouse gas, nitrous oxide (N2O). A number of factors are known to control these processes, including O2 concentrations and moisture content, N, C, pH, and the size and community structure of nitrate reducing organisms responsible for the processes. There is an increasing understanding associated with many of these controls on flux through the nitrogen cycle in soil systems. However, there remains uncertainty about how the nitrate reducing communities are linked to environmental variables and the flux of products from these processes. The high spatial variability of environmental controls and microbial communities across small sub centimeter areas of soil may prove to be critical in determining why an understanding of the links between biotic and abiotic controls has proved elusive. This spatial effect is often overlooked as a driver of nitrate reducing processes. An increased knowledge of the effects of spatial heterogeneity in soil on nitrate reduction processes will be fundamental in understanding the drivers, location, and potential for N2O production from soils.

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Response of nitrogen-transforming microorganisms to arbuscular mycorrhizal fungi

Cited by 68 publications

References 21 publications

Arbuscular mycorrhiza and soil nitrogen cycling

Arbuscular mycorrhiza and soil nitrogen cycling

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

Soil nitrate reducing processes – drivers, mechanisms for spatial variation, and significance for nitrous oxide production

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