Soil Mechanical Resistance and Root Growth and Function

Habib, Mohammad Tanbir; Heller, Till; Polle, Andrea

doi:10.1201/b14550-46

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…Besides bacteria, particularly mycorrhizal fungi are known to be effective in both, mineralization and solubilization of soil phosphorus (Bolan, ; Habib et al ., ). However, in our data sets solely Ascomycota harboured few alkaline and acid phosphatase genes.…”

Section: Discussionmentioning

confidence: 97%

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Bergkemper

Schöler

Engel

et al. 2016

Environmental Microbiology

235

109

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Phosphorus (P) is an important macronutrient for all biota on earth but similarly a finite resource. Microorganisms play on both sides of the fence as they effectively mineralize organic and solubilize precipitated forms of soil phosphorus but conversely also take up and immobilize P. Therefore, we analysed the role of microbes in two beech forest soils with high and low P content by direct sequencing of metagenomic deoxyribonucleic acid. For inorganic P solubilization, a significantly higher microbial potential was detected in the P-rich soil. This trait especially referred to Candidatus Solibacter usiatus, likewise one of the dominating species in the data sets. A higher microbial potential for efficient phosphate uptake systems (pstSCAB) was detected in the P-depleted soil. Genes involved in P starvation response regulation (phoB, phoR) were prevalent in both soils. This underlines the importance of effective phosphate (Pho) regulon control for microorganisms to use alternative P sources during phosphate limitation. Predicted genes were primarily harboured by Rhizobiales, Actinomycetales and Acidobacteriales.

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Section: Discussionmentioning

confidence: 97%

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Bergkemper

Schöler

Engel

et al. 2016

Environmental Microbiology

235

109

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show abstract

“…Besides bacteria particularly mycorrhizal fungi are known to be effective in both, mineralization and solubilization of soil phosphorus (Bolan, 1991;Habib et al, 2013). However in our datasets solely Ascomycota harbored few alkaline and acid phosphatase genes.…”

Section: Accepted Articlementioning

confidence: 82%

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Bergkemper¹,

Schöler²,

Engel³

et al. 2016

Environmental Microbiology

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Phosphorus (P) is an important macronutrient for all biota on earth but similarly a finite resource. Microorganisms play on both sides of the fence as they effectively mineralize organic and solubilize precipitated forms of soil phosphorus, but conversely also take up and immobilize P. Therefore, we analyzed the role of microbes in two beech forest soils with high and low P content by direct sequencing of metagenomic DNA. For inorganic P solubilization, a significantly higher microbial potential was detected in the P-rich soil. This trait especially referred to Candidatus Solibacter usiatus, likewise one of the dominating species in the datasets. A higher microbial potential for efficient phosphate uptake systems (pstSCAB) was detected in the P-depleted soil. Genes involved in P starvation response regulation (phoB, phoR) were prevalent in both soils. This underlines the importance of effective phosphate (Pho) regulon control for microorganisms to use alternative P sources during phosphate limitation. Predicted genes were primarily harbored by Rhizobiales, Actinomycetales and Acidobacteriales.

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“…EcM fungi exude different exoenzymes to mobilize nutrient resources (Cairney, 2011; Plassard et al, 2011; Pritsch and Garbaye, 2011; Hobbie and Högberg, 2012; Habib et al, 2013), but groupings for these traits are still lacking because of strong variations of the enzyme activities with their biotic and abiotic environment (Courty et al, 2008). Currently, the most frequently used classification system assigns EcM fungi according to their hyphal morphology such as lengths, densities, and surface properties to different soil exploration types, which reflect spatial differences for nutrient absorption (Agerer, 2001).…”

Section: Discussionmentioning

confidence: 99%

Spatial Patterns of Ectomycorrhizal Assemblages in a Monospecific Forest in Relation to Host Tree Genotype

Lang¹,

Finkeldey²,

Polle³

2013

Front. Plant Sci.

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Ectomycorrhizas (EcM) are important for soil exploration and thereby may shape belowground interactions of roots. We investigated the composition and spatial structures of EcM assemblages in relation to host genotype in an old-growth, monospecific beech (Fagus sylvatica) forest. We hypothesized that neighboring roots of different beech individuals are colonized by similar EcM assemblages if host genotype had no influence on the fungal colonization and that the similarity would decrease with increasing distance of the sampling points. The alternative was that the EcM species showed preferences for distinct beech genotypes resulting in intraspecific variation of EcM-host assemblages. EcM species identities, abundance and exploration type as well as the genotypes of the colonized roots were determined in each sampling unit of a 1 L soil core (r = 0.04 m, depth 0.2 m). The Morisita-Horn similarity indices (MHSI) based on EcM species abundance and multiple community comparisons were calculated. No pronounced variation of MHSI with increasing distances of the sampling points within a plot was found, but variations between plots. Very high similarities and no between plot variation were found for MHSI based on EcM exploration types suggesting homogenous soil foraging in this ecosystem. The EcM community on different root genotypes in the same soil core exhibited high similarity, whereas the EcM communities on the root of the same tree genotype in different soil cores were significantly dissimilar. This finding suggests that spatial structuring of EcM assemblages occurs within the root system of an individual. This may constitute a novel, yet unknown mechanism ensuring colonization by a diverse EcM community of the roots of a given host individual.

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Soil Mechanical Resistance and Root Growth and Function

Cited by 7 publications

References 1 publication

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems

Spatial Patterns of Ectomycorrhizal Assemblages in a Monospecific Forest in Relation to Host Tree Genotype

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