Plant microbiome structure and benefits for sustainable agriculture

Santos, Lidiane Figueiredo dos; Olivares, Fábio Lopes

doi:10.1016/j.cpb.2021.100198

Cited by 119 publications

(56 citation statements)

References 112 publications

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“…Genus names and generation code are listed on the left. RA represents relative abundance of read counts consequently changing the microbial composition (Qu et al 2020;Dos Santos and Olivares 2021;Rashid 2016). In our research we did not find a significant expression of pathogenesis-related genes in the soil after foliar application of SA on plant leaves.…”

Section: Discussioncontrasting

confidence: 52%

Belowground responses of bacterial communities to foliar SA application over four plant generations

et al. 2021

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Background and aims Jacobaea vulgaris plants grow better in sterilized than in live soil. Foliar application of SA mitigates this negative effect of live soil on plant growth. To examine what causes the positive effect of SA application on plant growth in live soils, we analyzed the effects of SA application on the composition of active rhizosphere bacteria in the soil. Methods We studied the composition of the microbial community over four consecutive plant cycles (generations), using mRNA sequencing of the microbial communities in the rhizosphere of J. vulgaris. We initiated the experiment with an inoculum of live soil collected from the field, and at the start of each subsequent plant cycle, we inoculated a small part of the soil from the previous plant cycle into sterile bulk soil. Results Application of SA did not significantly increase or decrease the Shannon diversity at genus level within each generation, but several specific genera were enriched or depleted after foliar SA application. The composition of bacterial communities in the rhizosphere significantly differed between plant cycles (generations), but application of SA did not alter this pattern. In the first generation no genera were significantly affected by the SA treatment, but in the second, third and fourth generations, specific genera were significantly affected. 89 species out of the total 270 (32.4%) were present as the “core” microbiome in all treatments over four plant cycles. Conclusions Overall, our study shows that the composition of bacterial genera in the rhizosphere significantly differed between plant cycles, but that it was not strongly affected by foliar application of SA on J. vulgaris leaves. Further studies should examine how activation of the SA signaling pathway in the plant changes the functional genes of the rhizosphere bacterial community.

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Section: Discussioncontrasting

confidence: 52%

Belowground responses of bacterial communities to foliar SA application over four plant generations

et al. 2021

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“…It is also documented that approximately up to 10 11 microbial cells g −1 of the root are present in this rhizospheric unit, accounting for more than 30,000 prokaryotes [ 78 ]. Moreover, the rhizospheric component of the soil is characterized as a zone that is influenced by exudates and roots’ secretions, which are vital for plant growth and health along with the microbial community [ 79 ]. The release of a variety of soil metabolites viz., organic acids, inorganic acids, siderophores, sugars, vitamins, amino acids, purines, nucleosides, polysaccharide mucilage, etc., is reported by different researchers.…”

Section: Effects Of Si-nps On the Rhizospheric Microbiomementioning

confidence: 99%

Effects of Silicon and Silicon-Based Nanoparticles on Rhizosphere Microbiome, Plant Stress and Growth

Rajput

Minkina

Feizi

et al. 2021

Biology

137

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Silicon (Si) is considered a non-essential element similar to cadmium, arsenic, lead, etc., for plants, yet Si is beneficial to plant growth, so it is also referred to as a quasi-essential element (similar to aluminum, cobalt, sodium and selenium). An element is considered quasi-essential if it is not required by plants but its absence results in significant negative consequences or anomalies in plant growth, reproduction and development. Si is reported to reduce the negative impacts of different stresses in plants. The significant accumulation of Si on the plant tissue surface is primarily responsible for these positive influences in plants, such as increasing antioxidant activity while reducing soil pollutant absorption. Because of these advantageous properties, the application of Si-based nanoparticles (Si-NPs) in agricultural and food production has received a great deal of interest. Furthermore, conventional Si fertilizers are reported to have low bioavailability; therefore, the development and implementation of nano-Si fertilizers with high bioavailability could be crucial for viable agricultural production. Thus, in this context, the objectives of this review are to summarize the effects of both Si and Si-NPs on soil microbes, soil properties, plant growth and various plant pathogens and diseases. Si-NPs and Si are reported to change the microbial colonies and biomass, could influence rhizospheric microbes and biomass content and are able to improve soil fertility.

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“…In addition to using HS as soil amendment [209][210][211][212], to enrich root microbiome structure and health [213,214], to regulate plant growth [194,202,206,[215][216][217][218][219], and as a eustressor [220,221], humics also contribute to green chemistry, control environmental pollution, and contribute substantially to improving global soil fertility and water quality [122]. For example, the use of HS appears to be a suitable remediation strategy for soils heavily contaminated with trace metals and other pollutants [222][223][224][225][226]; humics stabilize composted sewage sludge by interacting with metal and organic ions, and may control the fate of macro and micronutrients [227], and facilitate pollutant removal during water treatment [228][229][230].…”

Section: Humification: a Dynamic Equilibrium That Sustains Soil Organic Mattermentioning

confidence: 99%

Elaboration of a Phytoremediation Strategy for Successful and Sustainable Rehabilitation of Disturbed and Degraded Land

et al. 2022

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Humans are dependent upon soil which supplies food, fuel, chemicals, medicine, sequesters pollutants, purifies and conveys water, and supports the built environment. In short, we need soil, but it has little or no need of us. Agriculture, mining, urbanization and other human activities result in temporary land-use and once complete, used and degraded land should be rehabilitated and restored to minimize loss of soil carbon. It is generally accepted that the most effective strategy is phyto-remediation. Typically, phytoremediation involves re-invigoration of soil fertility, physicochemical properties, and its microbiome to facilitate establishment of appropriate climax cover vegetation. A myco-phytoremediation technology called Fungcoal was developed in South Africa to achieve these outcomes for land disturbed by coal mining. Here we outline the contemporary and expanded rationale that underpins Fungcoal, which relies on in situ bio-conversion of carbonaceous waste coal or discard, in order to explore the probable origin of humic substances (HS) and soil organic matter (SOM). To achieve this, microbial processing of low-grade coal and discard, including bio-liquefaction and bio-conversion, is examined in some detail. The significance, origin, structure, and mode of action of coal-derived humics are recounted to emphasize the dynamic equilibrium, that is, humification and the derivation of soil organic matter (SOM). The contribution of plant exudate, extracellular vesicles (EV), extra polymeric substances (EPS), and other small molecules as components of the dynamic equilibrium that sustains SOM is highlighted. Arbuscular mycorrhizal fungi (AMF), saprophytic ectomycorrhizal fungi (EMF), and plant growth promoting rhizobacteria (PGPR) are considered essential microbial biocatalysts that provide mutualistic support to sustain plant growth following soil reclamation and restoration. Finally, we posit that de novo synthesis of SOM is by specialized microbial consortia (or ‘humifiers’) which use molecular components from the root metabolome; and, that combinations of functional biocatalyst act to re-establish and maintain the soil dynamic. It is concluded that a bio-scaffold is necessary for functional phytoremediation including maintenance of the SOM dynamic and overall biogeochemistry of organic carbon in the global ecosystem

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Plant microbiome structure and benefits for sustainable agriculture

Cited by 119 publications

References 112 publications

Belowground responses of bacterial communities to foliar SA application over four plant generations

Belowground responses of bacterial communities to foliar SA application over four plant generations

Effects of Silicon and Silicon-Based Nanoparticles on Rhizosphere Microbiome, Plant Stress and Growth

Elaboration of a Phytoremediation Strategy for Successful and Sustainable Rehabilitation of Disturbed and Degraded Land

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