Nutrient cycling in the mycorrhizosphere

Azcón‐Aguilar, Concepción; Barea, J. M.

doi:10.4067/s0718-95162015005000035

Cited by 56 publications

(46 citation statements)

References 133 publications

(149 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The volume of soil concurrently impacted by plant roots and mycorrhizal fungal hyphae, the mycorrhizosphere (Fig. c), also harbours distinct rhizobacterial communities (Azcón‐Aguilar & Barea ). The hyphosphere (Fig.…”

Section: Interactions Between Plant Roots Fungi and Bacteriamentioning

confidence: 99%

The role of locally adapted mycorrhizas and rhizobacteria in plant–soil feedback systems

2016

View full text Add to dashboard Cite

Summary1. The plant-soil feedback (PSF) framework has become an important theory in plant ecology, yet many ecological and evolutionary factors that influence PSFs have yet to be fully considered. Here, we discuss the importance of local adaptation among plants and root-associated fungi and bacteria. Furthermore, we show how inclusion of the optimal resource allocation (OA) model can help predict the direction and outcome of PSFs under environmental change. 2. Plants and associated soil microbes have co-evolved for millennia, generating adaptations to each other and to their local environment. This local co-adaptation is likely generated by a suite of multidirectional exchanges of goods and services among plants, fungi and bacteria, and the constant changes in above-ground-below-ground interactions. 3. Resource limitation may be a driver of local adaptation among organisms involved in nutritional symbioses. The OA model states that when an essential resource is limited, natural selection will favour taxa that forage optimally by adjusting their biomass and energy allocation such that productivity is equally limited by all resources. Co-adaptation will therefore respond to the local limiting resource conditions through taxa-specific resource transfer interactions. 4. The OA model can help predict the outcomes of PSFs across a range of resource gradients and environmental changes such as increasing drought or atmospheric nitrogen deposition. Positive feedback is predicted in systems where resource exchange among plants and associated soil microbes can ameliorate resource limitation, or in systems where microbes provide another important service such as pathogen defence. Feedback strength is expected to diminish as resources become less limiting. Negative feedback is predicted when resources are in luxury supply and populations of opportunistic plant pathogens increase relative to commensal or mutualist microbes. 5. Future, field-based studies that integrate naturally co-occurring systems of plants, microbes and their local soil are needed to further test the hypothesis that resource availability is an effective predictor of the direction and magnitude of PSFs. A more mechanistic understanding of PSFs will help land managers and farmers to manipulate plant-microbial soil interactions to respond to environmental change and to effectively harness beneficial symbioses for plant nutrition and pathogen control.

show abstract

Section: Interactions Between Plant Roots Fungi and Bacteriamentioning

confidence: 99%

The role of locally adapted mycorrhizas and rhizobacteria in plant–soil feedback systems

2016

View full text Add to dashboard Cite

show abstract

“…Among the most important strategies to cope with low nutrient availability are symbiotic mycorrhizal associations (Castillo et al, 2006;Etcheverría et al, 2009;Borie et al, 2010;Azcón-Aguilar and Barea, 2015). Specifically, Turner (2008) (Davison et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhizal assemblages along contrasting Andean forests of Southern Chile

Marín¹,

Aguilera²,

Cornejo³

et al. 2016

J. Soil Sci. Plant Nutr.

View full text Add to dashboard Cite

Southern Chilean pristine temperate rainforests have been floristically stable during the Holocene, thus representing a pre-industrial baseline of forest ecology. Given this and its edaphic limitations, it is imperative to better understand these forests ecological patterns of mycorrhizal symbiosis. Therefore, here we compare the arbuscular mycorrhizal (AM) communities in three treeline Nothofagus pumilio contrasting plots of Chilean Andes (a volcano crater, pristine forest, and disturbed forest). The AM community assemblages were determined by morphological identification and spore counting, in three A horizon soil samples by plot. In the same nine soil samples, standard chemical analysis was performed. Eighteen AM species were described; Acaulospora was the most abundant genus. The forest plot had the highest AM species richness compared to the disturbed and crater plots. Interestingly, soils Olsen P (plant available phosphorus), pH, and Al+++ saturation similarly affected the AM assemblages. We suggest that some AM species could be specially adapted to extremely high Al saturation and extremely low plant available P conditions, as those experienced on Andean Nothofagus forests. These species may help initiate biological succession on highly disturbed ecosystems. We suggest that mycorrhizal fungi play a key role in seedling colonization of extreme environments such as the Andean treeline.

show abstract

“…This observation coincides with studies of Baum et al [48], who found reduced biodiversity of ectomycorrhizal fungi and reduced extraradical mycelium in the rhizosphere of Salix viminalis after fertilisation. The rhizosphere with mycorrhiza is known as that compartment with a high nutrient turnover [49]. With increasing age of the trees, a network of roots is formed, which enhances the retention of NO 3 − from one rotation period to the next and thereby reducing the leaching of NO 3…”

Section: Driving Forces Of No 3 − Leaching In Srcmentioning

confidence: 99%

Environmental Effects over the First 2½ Rotation Periods of a Fertilised Poplar Short Rotation Coppice

et al. 2017

View full text Add to dashboard Cite

A short rotation coppice (SRC) with poplar was established in a randomised fertilisation experiment on sandy loam soil in Potsdam (Northeast Germany). The main objective of this study was to assess if negative environmental effects as nitrogen leaching and greenhouse gas emissions are enhanced by mineral nitrogen (N) fertiliser applied to poplar at rates of 0, 50 and 75 kg N ha −1 year −1 and how these effects are influenced by tree age with increasing number of rotation periods and cycles of organic matter decomposition and tree growth after each harvesting event. Between 2008 and 2012, the leaching of nitrate (NO 3 − ) was monitored with self-integrating accumulators over 6-month periods and the emissions of the greenhouse gases (GHG) nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) were determined in closed gas chambers. During the first 4 years of the poplar SRC, most nitrogen was lost through NO 3 − leaching from the main root zone; however, there was no significant relationship to the rate of N fertilisation. On average, 5.8 kg N ha −1 year −1 (13.0 kg CO 2equ ) was leached from the root zone. Nitrogen leaching rates decreased in the course of the 4-year study parallel to an increase of the fine root biomass and the degree of mycorrhization. In contrast to N leaching, the loss of nitrogen by N 2 O emissions from the soil was very low with an average of 0.61 kg N ha −1 year −1 (182 kg CO 2equ ) and were also not affected by N fertilisation over the whole study period. Real CO 2 emissions from the poplar soil were two orders of magnitude higher ranging between 15,122 and 19,091 kg CO 2 ha −1 year −1 and followed the rotation period with enhanced emission rates in the years of harvest. As key-factors for NO 3 − leaching and N 2 O emissions, the time after planting and after harvest and the rotation period have been identified by a mixed effects model.

show abstract

Nutrient cycling in the mycorrhizosphere

Cited by 56 publications

References 133 publications

The role of locally adapted mycorrhizas and rhizobacteria in plant–soil feedback systems

The role of locally adapted mycorrhizas and rhizobacteria in plant–soil feedback systems

Arbuscular mycorrhizal assemblages along contrasting Andean forests of Southern Chile

Environmental Effects over the First 2½ Rotation Periods of a Fertilised Poplar Short Rotation Coppice

Contact Info

Product

Resources

About