The interaction between Rhizoglomus irregulare and hyphae attached phosphate solubilizing bacteria increases plant biomass of Solanum lycopersicum

Sharma, Shubhangi; Compant, Stéphane; Ballhausen, Max‐Bernhard; Ruppel, Silke; Franken, Philipp

doi:10.1016/j.micres.2020.126556

Cited by 52 publications

(25 citation statements)

References 52 publications

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“…Both, the release of organic compounds and physical blockage are likely higher for M substrates that contained AMF. This is because the filamentous growth form of these fungi is an efficient space filling structure on a finer scale than roots (Ritz and Young 2004) and AMF-associated bacteria can form biofilms on hyphal surfaces (Sharma et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula

et al. 2020

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Aim We investigated how substrate hydraulic properties respond to the presence of arbuscular mycorrhizal fungi (AMF) in root-containing and root-free substrate zones in a Medicago truncatula-Rhizophagus irregularis model system. Methods Before planting, two compartments constructed from standard soil sampling cores (250 cm3) were implanted into non-mycorrhizal and mycorrhizal pots containing a sand-zeolite-soil mix. One compartment allowed root penetration (1 mm mesh cover) and the other only hyphal ingrowth (42 μm mesh cover). After eight weeks of growth under maintenance of moist conditions, the cores were subjected to water retention measurements. Additionally, we measured water retention of bare substrates before and after drying events to check for successful maintenance of moist conditions in pots. Results Drying of bare substrates decreased water retention, but planting at least sustained it. The parameters of water retention models responded linearly to root morphological traits across mycorrhizal and non-mycorrhizal substrates. Hyphae-only colonization comparatively affected the course of water retention in ways that suggest increased pore space heterogeneity while maintaining water storage capacity of substrates. Conclusions Hence, water contents corresponded to different substrate matric potentials in non-mycorrhizal and mycorrhizal pots. We conclude that changes to water retention in AMF colonized substrates can contribute to a widely observed phenomenon, i.e. that mycorrhizal plants differ in their moisture stress response from non-mycorrhizal plants.

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Section: Discussionmentioning

confidence: 99%

Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula

et al. 2020

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“…Consistent data were obtained by a recent work reporting the isolation of 128 bacterial strains from the hyphae of Rhizoglomus irregulare (syn. Rhizophagus irregularis), of which 12 showed phosphate-solubilizing activity (Sharma et al 2020). A distinct bacterial community closely associated with extraradical hyphae of Glomus versiforme, and conserved across divergent soils, was mainly represented by Proteobacteria (50% relative abundance), Actinobacteria (10%), Chloroflexi (9%), Acidobacteria (7%), Bacteroidetes (6%), and Fibrobacteres (4%) (Emmett et al 2021).…”

Section: Amycolatopsismentioning

confidence: 99%

“…Arbuscular mycorrhizal fungi live closely associated with large and diverse bacterial communities which may colonize spores, sporocarps, and extraradical hyphae, originating a complex and metabolically active environment called the mycorrhizosphere (Rambelli 1973). Such microbiota show different plant growth-promoting properties (plant hormone, antibiotic, and siderophore production; N 2 fixation; P solubilization) and mycorrhiza helper activities (spore germination and mycelial growth promotion, mycorrhizal establishment facilitation) also have been observed, leading to enhancement of host plant performance (Bharadwaj et al 2008a;Battini et al 2016;Sharma et al 2020). The potential functional complementarity and synergistic activity of AMF and their associated microbiota necessitate studies aimed at understanding the complex network of interactions between them and their host plants (Turrini et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Possible role of arbuscular mycorrhizal fungi and associated bacteria in the recruitment of endophytic bacterial communities by plant roots

et al. 2021

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Arbuscular mycorrhizal fungi (AMF) represent an important group of root symbionts, given the key role they play in the enhancement of plant nutrition, health, and product quality. The services provided by AMF often are facilitated by large and diverse beneficial bacterial communities, closely associated with spores, sporocarps, and extraradical mycelium, showing different functional activities, such as N2 fixation, nutrient mobilization, and plant hormone, antibiotic, and siderophore production and also mycorrhizal establishment promotion, leading to the enhancement of host plant performance. The potential functional complementarity of AMF and associated microbiota poses a key question as to whether members of AMF-associated bacterial communities can colonize the root system after establishment of mycorrhizas, thereby becoming endophytic. Root endophytic bacterial communities are currently studied for the benefits provided to host plants in the form of growth promotion, stress reduction, inhibition of plant pathogens, and plant hormone release. Their quantitative and qualitative composition is influenced by many factors, such as geographical location, soil type, host genotype, and cultivation practices. Recent data suggest that an additional factor affecting bacterial endophyte recruitment could be AMF and their associated bacteria, even though the mechanisms allowing members of AMF-associated bacterial communities to actually establish in the root system, becoming endophytic, remain to be determined. Given the diverse plant growth–promoting properties shown by AMF-associated bacteria, further studies are needed to understand whether AMF may represent suitable tools to introduce beneficial root endophytes in sustainable and organic agriculture where the functioning of such multipartite association may be crucial for crop production.

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“…These fungi-associated bacteria can feed on fungus-derived exudates, in exchange for beneficial services provided to the fungi [16,19,20]. In addition to this, some of the bacteria inhabiting the myco/saprorhizosphere can form tight physical associations with the fungi which can often lead to the formation of biofilm-like structures [21][22][23][24]. Biofilms are described as the aggregation of bacterial cells embedded into a self-produced matrix of extracellular polymeric substances [25].…”

Section: Introductionmentioning

confidence: 99%

It Takes Two to Tango: A Bacterial Biofilm Provides Protection against a Fungus-Feeding Bacterial Predator

et al. 2021

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Fungus-bacterium interactions are widespread, encompass multiple interaction types from mutualism to parasitism, and have been frequent targets for microbial inoculant development. In this study, using in vitro systems combined with confocal laser scanning microscopy and real-time quantitative PCR, we test whether the nitrogen-fixing bacterium Kosakonia radicincitans can provide protection to the plant-beneficial fungus Serendipita indica, which inhabits the rhizosphere and colonizes plants as an endophyte, from the fungus-feeding bacterium Collimonas fungivorans. We show that K. radicincitans can protect fungal hyphae from bacterial feeding on solid agar medium, with probable mechanisms being quick hyphal colonization and biofilm formation. We furthermore find evidence for different feeding modes of K. radicincitans and C. fungivorans, namely “metabolite” and “hyphal feeding”, respectively. Overall, we demonstrate, to our knowledge, the first evidence for a bacterial, biofilm-based protection of fungal hyphae against attack by a fungus-feeding, bacterial predator on solid agar medium. Besides highlighting the importance of tripartite microbial interactions, we discuss implications of our results for the development and application of microbial consortium-based bioprotectants and biostimulants.

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The interaction between Rhizoglomus irregulare and hyphae attached phosphate solubilizing bacteria increases plant biomass of Solanum lycopersicum

Cited by 52 publications

References 52 publications

Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula

Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula

Possible role of arbuscular mycorrhizal fungi and associated bacteria in the recruitment of endophytic bacterial communities by plant roots

It Takes Two to Tango: A Bacterial Biofilm Provides Protection against a Fungus-Feeding Bacterial Predator

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