Wooden biochar as a carrier for endophytic isolates

Vecstaudza, Dagnija; Seņkovs, Māris; Nikolajeva, Vizma; Kasparinskis, Raimonds; Muter, Olga

doi:10.1016/j.rhisph.2017.04.002

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…Biochar can change soil fertility parameters that influence microbial survival in soil, including pH, organic matter content, cation exchange capacity and nutrient retention, water retention and oxygen tension, bulk density and provide niche spaces for microbes, thus preventing grazing by fungal predators ( Major, 2009 ; Clough and Condron, 2010 ; Gaskin et al, 2010 ; Singh et al, 2010 ; Van Zwieten et al, 2010 ; Kameyama et al, 2012 ; Jaafar, 2014 ; Ye et al, 2016 ; Backer et al, 2017 ; Jenkins et al, 2017 ). Recent research has also investigated the use of biochar as a carrier material for microbial inoculants, applied as seed-coatings, constituting a sustainable alternative to peat-based inoculants, and promoting early colonization of the rhizosphere with beneficial microorganisms ( Rondon et al, 2007 ; Budania and Yadav, 2014 ; Adam et al, 2016 ; Deb et al, 2016 ; Egamberdieva et al, 2016 ; Głodowska et al, 2016 ; Kim et al, 2016 ; Shanta et al, 2016 ; Siddiqui et al, 2016 ; Sun et al, 2016 ; Traxler et al, 2016 ; Nadeem et al, 2017 ; Vecstaudza et al, 2017 ). It is important to note, however, that not all biochar materials are the same; biochar production conditions and feedstock materials have a large influence on the biological, chemical and physical properties of the final biochar material and while many provide desirable effects on soil fertility, some can be toxic to microbes and/or plants ( Nguyen et al, 2017 ; Wang et al, 2017 ).…”

Section: Strategies For Improving Rhizosphere Colonization By Pgpr Inmentioning

confidence: 99%

Plant Growth-Promoting Rhizobacteria: Context, Mechanisms of Action, and Roadmap to Commercialization of Biostimulants for Sustainable Agriculture

et al. 2018

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Microbes of the phytomicrobiome are associated with every plant tissue and, in combination with the plant form the holobiont. Plants regulate the composition and activity of their associated bacterial community carefully. These microbes provide a wide range of services and benefits to the plant; in return, the plant provides the microbial community with reduced carbon and other metabolites. Soils are generally a moist environment, rich in reduced carbon which supports extensive soil microbial communities. The rhizomicrobiome is of great importance to agriculture owing to the rich diversity of root exudates and plant cell debris that attract diverse and unique patterns of microbial colonization. Microbes of the rhizomicrobiome play key roles in nutrient acquisition and assimilation, improved soil texture, secreting, and modulating extracellular molecules such as hormones, secondary metabolites, antibiotics, and various signal compounds, all leading to enhancement of plant growth. The microbes and compounds they secrete constitute valuable biostimulants and play pivotal roles in modulating plant stress responses. Research has demonstrated that inoculating plants with plant-growth promoting rhizobacteria (PGPR) or treating plants with microbe-to-plant signal compounds can be an effective strategy to stimulate crop growth. Furthermore, these strategies can improve crop tolerance for the abiotic stresses (e.g., drought, heat, and salinity) likely to become more frequent as climate change conditions continue to develop. This discovery has resulted in multifunctional PGPR-based formulations for commercial agriculture, to minimize the use of synthetic fertilizers and agrochemicals. This review is an update about the role of PGPR in agriculture, from their collection to commercialization as low-cost commercial agricultural inputs. First, we introduce the concept and role of the phytomicrobiome and the agricultural context underlying food security in the 21st century. Next, mechanisms of plant growth promotion by PGPR are discussed, including signal exchange between plant roots and PGPR and how these relationships modulate plant abiotic stress responses via induced systemic resistance. On the application side, strategies are discussed to improve rhizosphere colonization by PGPR inoculants. The final sections of the paper describe the applications of PGPR in 21st century agriculture and the roadmap to commercialization of a PGPR-based technology.

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Section: Strategies For Improving Rhizosphere Colonization By Pgpr Inmentioning

confidence: 99%

Plant Growth-Promoting Rhizobacteria: Context, Mechanisms of Action, and Roadmap to Commercialization of Biostimulants for Sustainable Agriculture

et al. 2018

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“…Though, the role of plant growing medium composition as a potential driver in the success of PGPR amendment is much less clear. Recent research has studied the use of plant growing medium constituents as a carrier material for bacterial inocula [33,40,41,58,59]. For example, Nadeem et al [41] showed that the combined use of biochar, compost, and the PGPR Pseudomonas fluorescens alleviated the negative effect of water deficit on cucumber growth.…”

Section: Introductionmentioning

confidence: 99%

Microbe-Plant Growing Media Interactions Modulate the Effectiveness of Bacterial Amendments on Lettuce Performance Inside a Plant Factory with Artificial Lighting

Gerrewey

Vandecruys²,

Ameloot³

et al. 2020

Agronomy

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There is a need for plant growing media that can support a beneficial microbial root environment to ensure that optimal plant growth properties can be achieved. We investigated the effect of five rhizosphere bacterial community inocula (BCI S1–5) that were collected at three open field organic farms and two soilless farms on the performance of lettuce (Lactuca sativa L.). The lettuce plants were grown in ten different plant growing media (M1–10) composed of 60% v/v peat (black peat or white peat), 20% v/v other organics (coir pith or wood fiber), 10% v/v composted materials (composted bark or green waste compost) and 10% v/v inorganic materials (perlite or sand), and one commercial plant growing medium inside a plant factory with artificial lighting. Fractional factorial design of experiments analysis revealed that the bacterial community inoculum, plant growing medium composition, and their interaction determine plant performance. The impact of bacterial amendments on the plant phenotype relied on the bacterial source. For example, S3 treatment significantly increased lettuce shoot fresh weight (+57%), lettuce head area (+29%), root fresh weight (+53%), and NO3-content (+53%), while S1 treatment significantly increased lettuce shoot dry weight (+15%), total phenolic content (+65%), and decreased NO3-content (−67%). However, the effectiveness of S3 and S1 treatment depended on plant growing medium composition. Principal component analysis revealed that shoot fresh weight, lettuce head area, root fresh weight, and shoot dry weight were the dominant parameters contributing to the variation in the interactions. The dominant treatments were S3-M8, S1-M7, S2-M4, the commercial plant growing medium, S1-M2, and S3-M10. Proper selection of plant growing medium composition is critical for the efficacy of bacterial amendments and achieving optimal plant performance inside a plant factory with artificial lighting.

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“…are widely distributed in soil (Burbank et al 2012). It was previously found that the consortium used in the present study significantly diminished urease activity in the soil and did not have any impact on the nitrification potential of soil (Vecstaudza et al 2017). It should be noted that urease and nitrification are not always considered as plant growth-promoting.…”

Section: Resultsmentioning

confidence: 48%

“…Endophytic microorganisms were isolated, identified and characterized with emphasis on nitrification potential, urease activity and P solubilizing activity. Previously, it was found that the created consortium did not have significant effect on shoot and root length of barley (Vecstaudza et al 2017). In this study, influence of a microbial consortium on rhizosphere microbiota was estimated in a greenhouse vegetation experiment with barley.…”

Section: Introductionmentioning

confidence: 90%

“…The vegetation experiment was conducted in 60 mL volume seed trays with 50 g of loamy soil and barley cv. `Austris` in a greenhouse for 19 days as described previously (Vecstaudza et al 2017). One mL of each microorganism isolate was mixed with sterile water to achieve 2.7 × 10 10 colony-forming units (CFU) mL -1 for bacteria and 1.2 × 10 7 CFU mL -1 for fungi.…”

Section: Testing Of Consortium Impact On Rhizosphere Microbiotamentioning

confidence: 99%

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Characteristics of an endophytic microbial consortium and its impact on rhizosphere microbiota of barley

2018

EEB

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Biological fertilizers are being developed on the basis of plant growth promoting microorganisms isolated from the plant rhizosphere, phyllosphere and endosphere. The aim of this study was to determine influence of a consortium of plant endophytes on rhizosphere microbiota in a greenhouse vegetation experiment with barley. Fifty-five bacterial and fungal strains were isolated from leaves, stems and roots of oilseed rape and barley. Twentty five of them did not inhibit seed germination. Most of them belonged to the genera Serratia, Enterobacter, Brevibacillus and Pseudomonas. Individual isolates demonstrated phosphate solubilization ability, nitrification potential and urease activity. Impact of the multi-strain microbial consortium on cultivable microbiota of rhizosphere was estimated in a 19-day greenhouse experiment with barley. Concentration of phosphate solubilizing and cellulolytic microorganisms in the rhizosphere was below the detection limit. The consortium increased the total number of bacterial colony-forming units but did not affect the number of actinobacterial and fungal colony-forming units. Interactions between species in the multi-strain consortium and between introduced and indigenous populations are discussed.

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Wooden biochar as a carrier for endophytic isolates

Cited by 14 publications

References 10 publications

Plant Growth-Promoting Rhizobacteria: Context, Mechanisms of Action, and Roadmap to Commercialization of Biostimulants for Sustainable Agriculture

Plant Growth-Promoting Rhizobacteria: Context, Mechanisms of Action, and Roadmap to Commercialization of Biostimulants for Sustainable Agriculture

Microbe-Plant Growing Media Interactions Modulate the Effectiveness of Bacterial Amendments on Lettuce Performance Inside a Plant Factory with Artificial Lighting

Characteristics of an endophytic microbial consortium and its impact on rhizosphere microbiota of barley

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