The sapro-rhizosphere: Carbon flow from saprotrophic fungi into fungus-feeding bacteria

Ballhausen, Max Bernhard; Boer, Wietse de

doi:10.1016/j.soilbio.2016.06.014

Cited by 83 publications

(56 citation statements)

References 25 publications

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“…Traditionally, food webs have been divided into clear energy channels, or compartments: the root energy channel, which is fuelled by live roots through the activities of root-feeding nematodes and mycorrhizal fungi, and two detritus-fuelled compartments: the fungal and the bacterial energy channel. While these compartmentalisations are currently hotly debated and under revision (Ballhausen & de Boer 2016;Geisen 2016; see figure), agricultural intensification reduces the biomass of the root and fungal energy channels, and thereby increases the relative importance of the bacterial energy channel. Experimental and modelling studies have shown that the fungal energy channel, which consists of slow growing organisms and weak interactions, is more stable under disturbance than the bacterial energy channel and continues to function better (Rooney et al 2006;De Vries et al 2012a).…”

Section: Rhizosphere Network Are Recruited From Bulk Soil Networkmentioning

confidence: 99%

“…Most evidence that organismal network structure underlies soil functioning originates from studies on soil food webs, in which feeding interactions between organisms have empirically been quantified through decades of research (Bradford 2016). While the nature of soil food web interactions are currently under debate (Ballhausen & de Boer 2016;Geisen 2016), existing food web models have successfully predicted C and N fluxes in natural and agricultural systems (De Ruiter et al 1993;Holtkamp et al 2011). In soil microbial networks, correlations between microbial taxa can result from a variety of interaction types (Box 1).…”

Section: The Rhizosphere Interactions For Sustainable Agriculture Modelmentioning

confidence: 99%

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Below‐ground connections underlying above‐ground food production: a framework for optimising ecological connections in the rhizosphere

2017

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Summary1. Healthy soils that contain an active microbiome and food web are critical to sustainably produce food for a growing global human population. Many studies have focussed on the role of microbial species diversity and the presence of key functional groups as important controls on the many functions that a sustainable food system relies on. 2. Here, we synthesise recent ecological empirical evidence and theory to propose that the interactions between organisms in the soil food web are the critical determinant of soil function. 3. We propose the Rhizosphere Interactions for Sustainable Agriculture Model, in which crop roots recruit small, modular, highly connected soil rhizosphere networks from large, static, relatively unconnected and diverse bulk soil networks. We argue that conventional agricultural management disrupts the connections between rhizosphere and bulk soil networks. 4. Synthesis. We identify future research directions for optimising ecological connections between roots and rhizosphere microbial and faunal networks, and between rhizosphere networks and bulk soil networks in agricultural production systems. Knowledge on these connections can be applied in agricultural systems to sustainability produce food for a growing global population.

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Section: Rhizosphere Network Are Recruited From Bulk Soil Networkmentioning

confidence: 99%

Section: The Rhizosphere Interactions For Sustainable Agriculture Modelmentioning

confidence: 99%

Below‐ground connections underlying above‐ground food production: a framework for optimising ecological connections in the rhizosphere

2017

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“…Scientists call this phenomenon "priming effect" (Guenet et al, 2010). The decomposer living network is still partially understood and under investigation (Straatsma et al, 1994;Anastasi et al, 2005;Jayasinghe and Parkinson, 2009;Mummey et al, 2010;Burns et al, 2013;Lange et al, 2015;Ballhausen and de Boer, 2016;Geisen et al, 2016); • During the process of respiration about 2/3 of the C content of organic remains is lost in the atmosphere as CO 2 and 1/3 incorporated in new microorganisms. If the C/N ratio of organic remains is ≤ 30, and if all N can be incorporated in new microbial structures (McDowell and Clark-McDowell, 2008), the process of biodegradation can go on fast and well until the complete utilisation of the organic remains.…”

Section: Manure Humus Systems: Techno Humus Systems With Soil Createdmentioning

confidence: 99%

Humusica 2, article 16: Techno humus systems and recycling of waste

Zanella

Ponge

Guercini

et al. 2018

Applied Soil Ecology

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Techno humus systems correspond to man-made topsoils under prominent man influence. They may be purposely\ud conceived for supporting agricultural activities or dumping of waste products, sometimes abandoned to\ud an unknown evolution. Both categories needed a more scientific frame. This is the reason we classified them as\ud morpho-functional humus systems. Improving agricultural soils with organic waste products is an ancestral\ud practice. We present four examples of techno humus systems purposely created for supporting plant growth.\ud Considering a simple home-made composting pile, we give a few basic notions about the biological functioning\ud of these artificial humus systems. Humipedon functioning and structuration are similar to those observed in\ud natural humus systems. Using even animal manure, we illustrate how to manage larger compost piles of waste\ud for application in farming areas. Composting waste that contains animal proteins needs a more careful measurement\ud of the temperature of the pile and a longer period of elevated temperature in the core of the pile.\ud Mulching of pruning residues is presented in a large urban context. The use of mulch must take into account\ud quality and composition of woody material. The lack of nutrients in some residues has to be compensated by a\ud moderate use of appropriate mineral fertilizers. Municipal solid waste, anaerobic digestion residues (grape remains)\ud and spent mushroom compost, eventually mixed with mineral fertilizers, have been tested in horticulture.\ud Benefits and drawbacks are listed for each experiment, with the evolution of carbon storage along 8\ud years of horticultural practice. Finally, we present an example of “dump” humus system. Mine tailing wastes\ud represent a huge problem in many countries. Pointing on their microbial activity, we show that they must be\ud seen as manageable living humipedons, not as piles of inert rocky material

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“…Also, the rapid decline of the introduced microbial population, reduce competitiveness, and plant colonization capability (9,10). Among the technological proposals aimed to increase the survival and activity of a specific microorganism introduced into the soil, we can mention the use of polymeric carriers, stabilized organic matter and its sub-fractions, organic additives, encapsulation, and combination with other microorganisms (1,2,11,12).…”

Section: Introductionmentioning

confidence: 99%

“…Different bacteria species can colonize the micro-habitat called sapro-rhizosphere (12) that encompassing the mycosphere and mycoplane of fungi hyphae, and which serve as a biotic surface for physical anchoring, chemical signal exchange and nutritional niche (12,(20)(21)(22)(23). Mycosphere competent-colonizer bacteria do not depend on the oligotrophic C-soil sources or highly competitive C-exuded by the plants in the rhizosphere (20).…”

Section: Introductionmentioning

confidence: 99%

Mutualistic interaction withTrichoderma longibrachiatumUENF-F476 boosted plant growth-promotion ofSerratia marcescensUENF-22GI

Reis

Alves

Santos

et al. 2020

Preprint

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BACKGROUND: A plethora of bacteria-fungal interactions occurs on the extended fungal hyphae network in soil. The mycosphere of saprophytic fungi can serve as a bacterial niche boosting their survival, dispersion, and activity. Such ecological concepts can be converted to bioproducts for sustainable agriculture. Accordingly, we tested the hypothesis that the well-characterized beneficial bacterium Serratia marcescens UENF-22GI can enhance their plant growth-promoting properties by combination with Trichoderma longibrachiatum UENF-F476. RESULTS: The colony and cell interactions demonstrated S. marcescens and T. longibrachiatum compatibility. Bacteria cells were able to attach, forming aggregates- biofilms and migrates through fungal hyphae network. Bacterial migration through growing hyphae was confirmed using two-compartment Petri dishes assay. Fungal inoculation increased the bacteria survival rates into the vermicompost substrate over the experimental time. Also, in vitro indolic compound, phosphorus, and zinc solubilization bacteria activities increased in the presence of the fungus. In line with the ecophysiological bacteria fitness, tomato and papaya plantlet growth was boosted by bacteria-fungi combination applied under plant nursery conditions. CONCLUSION: Mutualistic interaction between mycosphere-colonizing bacterium S. marcescens UENF-22GI and the saprotrophic fungi T. longibrachiatum UENF-F467 increased the ecological fitness of the bacteria alongside with beneficial potential for plant growth. A proper combination and delivery of compatible beneficial bacteria-fungus represent an open avenue for biological enrichment of plant substrates technologies in agricultural systems.

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The sapro-rhizosphere: Carbon flow from saprotrophic fungi into fungus-feeding bacteria

Cited by 83 publications

References 25 publications

Below‐ground connections underlying above‐ground food production: a framework for optimising ecological connections in the rhizosphere

Below‐ground connections underlying above‐ground food production: a framework for optimising ecological connections in the rhizosphere

Humusica 2, article 16: Techno humus systems and recycling of waste

Mutualistic interaction withTrichoderma longibrachiatumUENF-F476 boosted plant growth-promotion ofSerratia marcescensUENF-22GI

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