Mycorrhizosphere: The Extended Rhizosphere and Its Significance

Priyadharsini, Perumalsamy; Rojamala, Karunakaran; Ravi, R. Koshila; Muthuraja, Raji; Nagaraj, Kakanahalli; Muthukumar, Thangavelu

doi:10.1007/978-981-10-2854-0_5

Cited by 23 publications

(13 citation statements)

References 195 publications

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“…Most effects of eCO 2 on soil microbial processes are mediated by changes in the C allocated to roots below-ground (Kuzyakov et al, 2018;Paterson et al, 1997) which, in turn, impacts mycorrhizal fungi (Jones et al, 2004;Lladó et al, 2018;Priyadharsini et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂

et al. 2021

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1. Elevated atmospheric carbon dioxide (eCO 2 ) can impact soil organic matter (SOM) dynamics by changing the rates of carbon (C) losses and gains. In the rhizosphere, these changes are usually assumed to be the result of root-mediated eCO 2 impacts on saprotrophic microbes via altered below-ground C allocation. This C allocation can also impact mycorrhizal fungi and their role in SOM dynamics. However, direct field quantifications of the influence of roots on both mycorrhizal fungi and saprotrophs together with SOM dynamics in forests exposed to eCO 2 are rare. This is especially true in phosphorus (P)-limited systems, even though ecosystem responses to eCO 2 are known to depend on P availability.2. We assessed root mediation of eCO 2 impacts on saprotrophs, mycorrhizal fungi, and C dynamics of root litter and mineral soil C (SOM-C) in a mature, P-limited Eucalyptus woodland exposed to eCO 2 . We used a novel nested-mesh-bag method to manipulate roots access to the substrates in a 1-year field incubation.We used an isotopic approach to trace C dynamics and performed a comprehensive microbial community analysis, along with nutrients and enzymatic activity measurements.3. Roots increased microbial biomass, fungal:bacterial ratio, plant-derived C gains and substrate C losses while decreasing P availability and specific enzymatic activity. eCO 2 increased bacterial relative abundance in root litter and protozoa in SOM-C, but it did not enhance root impacts or mycorrhizal fungi biomass. 4. Our combination of in-situ approaches allowed us to demonstrate that while roots have multiple impacts on soil microbial communities and C dynamics, they are not the main drivers of responses to eCO 2 in this P-limited forest. Other factors beyond enhanced root-derived below-ground C inputs such as seasonality of nutrient and water availability, and shifts in plant communities may be more important in modulating eCO 2 impacts on soil dynamics in P-limited systems. K E Y W O R D Scarbon substrates, elevated CO 2 , forests, free-air CO 2 enrichment, mycorrhizae, rhizosphere, soil organic matter, stable isotopes | 2057Functional Ecology CASTAÑEDA-GÓMEZ ET Al.

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Section: Introductionmentioning

confidence: 99%

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂

et al. 2021

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“…Of these, AMF host plants Lotus (12.43%) and barley (10.91%) displayed higher relative abundances of Rhizobiales in their rhizospheres compared with the nonmycorrhizal plant Arabidopsis (4.45%), indicating that AM symbiosis promotion of rhizobia accumulation in the rhizosphere might be a general mechanism to further promote plant growth. The genetic program for AM has been recruited for legume-rhizobial symbiosis (Oldroyd, 2013), and our data suggest that AM symbiosis also provides a microenvironment, namely, the soil region influenced by the mycorrhizal roots, which has been termed the ''mycorrhizosphere'' (Priyadharsini et al, 2016), for the co-evolution of AM fungi and rhizobia.…”

Section: Discussionmentioning

confidence: 73%

Mycorrhizal symbiosis modulates the rhizosphere microbiota to promote rhizobia–legume symbiosis

Wang

Feng

Wang³

et al. 2021

Molecular Plant

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“…Rhizosphere is the narrow region of soil that is directly influenced by living roots, and the primary site of interaction between plants and microorganisms [ 23 , 24 ]. Many studies demonstrated that rhizosphere microbial community can be shaped by plant host habitat, root exudates, and root architectural or phenotypic traits [ 25 , 26 , 27 ].…”

Section: Discussionmentioning

confidence: 99%

Comparative Metagenomic Analysis of Rhizosphere Microbial Community Composition and Functional Potentials under Rehmannia glutinosa Consecutive Monoculture

Wang

et al. 2018

IJMS

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Consecutive monoculture of Rehmannia glutinosa, highly valued in traditional Chinese medicine, leads to a severe decline in both quality and yield. Rhizosphere microbiome was reported to be closely associated with the soil health and plant performance. In this study, comparative metagenomics was applied to investigate the shifts in rhizosphere microbial structures and functional potentials under consecutive monoculture. The results showed R. glutinosa monoculture significantly decreased the relative abundances of Pseudomonadaceae and Burkholderiaceae, but significantly increased the relative abundances of Sphingomonadaceae and Streptomycetaceae. Moreover, the abundances of genera Pseudomonas, Azotobacter, Burkholderia, and Lysobacter, among others, were significantly lower in two-year monocultured soil than in one-year cultured soil. For potentially harmful/indicator microorganisms, the percentages of reads categorized to defense mechanisms (i.e., ATP-binding cassette (ABC) transporters, efflux transporter, antibiotic resistance) and biological metabolism (i.e., lipid transport and metabolism, secondary metabolites biosynthesis, transport and catabolism, nucleotide transport and metabolism, transcription) were significantly higher in two-year monocultured soil than in one-year cultured soil, but the opposite was true for potentially beneficial microorganisms, which might disrupt the equilibrium between beneficial and harmful microbes. Collectively, our results provide important insights into the shifts in genomic diversity and functional potentials of rhizosphere microbiome in response to R. glutinosa consecutive monoculture.

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Mycorrhizosphere: The Extended Rhizosphere and Its Significance

Cited by 23 publications

References 195 publications

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂

Mycorrhizal symbiosis modulates the rhizosphere microbiota to promote rhizobia–legume symbiosis

Comparative Metagenomic Analysis of Rhizosphere Microbial Community Composition and Functional Potentials under Rehmannia glutinosa Consecutive Monoculture

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Mycorrhizosphere: The Extended Rhizosphere and Its Significance

Cited by 23 publications

References 195 publications

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO2

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO2

Mycorrhizal symbiosis modulates the rhizosphere microbiota to promote rhizobia–legume symbiosis

Comparative Metagenomic Analysis of Rhizosphere Microbial Community Composition and Functional Potentials under Rehmannia glutinosa Consecutive Monoculture

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The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂

The influence of roots on mycorrhizal fungi, saprotrophic microbes and carbon dynamics in a low‐phosphorus Eucalyptus forest under elevated CO₂