Effects of commercial microbial biostimulants on soil and root microbial communities and sugarcane yield

Berg, Shelby Kathleen; Dennis, Paul G.; Paungfoo‐Lonhienne, Chanyarat; Anderson, Jay Martin; Robinson, Nicole; Brackin, Richard; Royle, Adam; DiBella, Lawrence; Schmidt, Susanne

doi:10.1007/s00374-019-01412-4

Cited by 29 publications

(19 citation statements)

References 101 publications

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“…These findings contrast with previous studies showing minor and/or transient ecological impact of Azospirillum inoculants on the resident bacterial community colonizing the rhizosphere ( Ambrosini et al, 2016 ), by molecular fingerprinting in the case of maize ( Herschkovitz et al, 2005 ; Lerner et al, 2006 ; Matsumura et al, 2015 ), wheat ( Naiman et al, 2009 ; Baudoin et al, 2010 ), rice ( Pedraza et al, 2009 ; García de Salamone et al, 2010 , 2012 ; Bao et al, 2013 ), or other crops ( Correa et al, 2007 ; Felici et al, 2008 ), as well as by Illumina MiSeq metabarcoding in the case of maize ( da Costa et al, 2018 ). Modest inoculant impacts on the rhizobacterial community were also found with Bacillus on lettuce (by metagenomics; Kröber et al, 2014 ) and tomato (by pyrosequencing; Qiao et al, 2017 ), Pseudomonas on lettuce (by DGGE and pyrosequencing; Schreiter et al, 2014 ), Pseudomonas or Achromobacter on maize (by Illumina MiSeq; da Costa et al, 2018 ), Stenotrophomonas on maize (by Illumina MiSeq; Kusstatscher et al, 2020 ), multispecies inoculants on tomato (by Illumina MiSeq; Nuzzo et al, 2020 ) and wheat (by pyrosequencing; Dal Cortivo et al, 2020 ), or a multispecies organic amendment on sugarcane (by Illumina MiSeq; Berg et al, 2019 ), whereas a larger impact was observed by Illumina MiSeq with Pseudomonas on maize ( Ke et al, 2019 ) and different oilseed crops ( Jiménez et al, 2020 ); Pseudomonas , Paenibacillus , or Bacillus on lettuce ( Passera et al, 2020 ); an organic amendment enriched in microorganisms on strawberry ( Deng et al, 2019 ); or a multispecies inoculant on onion ( Pellegrini et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Field Site-Specific Effects of an Azospirillum Seed Inoculant on Key Microbial Functional Groups in the Rhizosphere

et al. 2022

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The beneficial effects of plant growth–promoting Rhizobacteria (PGPR) entail several interaction mechanisms with the plant or with other root-associated microorganisms. These microbial functions are carried out by multiple taxa within functional groups and contribute to rhizosphere functioning. It is likely that the inoculation of additional PGPR cells will modify the ecology of these functional groups. We also hypothesized that the inoculation effects on functional groups are site specific, similarly as the PGPR phytostimulation effects themselves. To test this, we assessed in the rhizosphere of field-grown maize the effect of seed inoculation with the phytostimulatory PGPR Azospirillum lipoferum CRT1 on the size and/or diversity of selected microbial functional groups important for plant growth, using quantitative polymerase chain reaction and/or Illumina MiSeq metabarcoding. The functional groups included bacteria able to fix nitrogen (a key nutrient for plant growth), producers of 1-aminocyclopropane-1-carboxylate (ACC) deaminase (which modulate ethylene metabolism in plant and stimulate root growth), and producers of 2,4-diacetylphloroglucinol (an auxinic signal enhancing root branching). To test the hypothesis that such ecological effects were site-specific, the functional groups were monitored at three different field sites, with four sampling times over two consecutive years. Despite poor inoculant survival, inoculation enhanced maize growth. It also increased the size of functional groups in the three field sites, at the maize six-leaf and flowering stages for diazotrophs and only at flowering stage for ACC deaminase and 2,4-diacetylphloroglucinol producers. Sequencing done in the second year revealed that inoculation modified the composition of diazotrophs (and of the total bacterial community) and to a lesser extent of ACC deaminase producers. This study revealed an ecological impact that was field specific (even though a few taxa were impacted in all fields) and of unexpected magnitude with the phytostimulatory Azospirillum inoculant, when considering microbial functional groups. Further methodological developments are needed to monitor additional functional groups important for soil functioning and plant growth under optimal or stress conditions.

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Section: Discussionmentioning

confidence: 99%

Field Site-Specific Effects of an Azospirillum Seed Inoculant on Key Microbial Functional Groups in the Rhizosphere

et al. 2022

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“…Despite the fact that microbial biostimulants are relatively common in agriculture, usually through PGPR products or vermicomposts, their effect on microbiomes is poorly documented. Berg S. et al (2020) studied the effect of microbial biostimulants on soil and root microbial communities. Although no significant differences were found in the diversity of these communities, except for the fungi, the tested biostimulants did not increase the yield.…”

Section: Microbial Biostimulantsmentioning

confidence: 99%

Plant Microbiota Beyond Farming Practices: A Review

Delitte

Caulier

Bragard

et al. 2021

Front. Sustain. Food Syst.

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Plants have always grown and evolved surrounded by numerous microorganisms that inhabit their environment, later termed microbiota. To enhance food production, humankind has relied on various farming practices such as irrigation, tilling, fertilization, and pest and disease management. Over the past few years, studies have highlighted the impacts of such practices, not only in terms of plant health or yields but also on the microbial communities associated with plants, which have been investigated through microbiome studies. Because some microorganisms exert beneficial traits that improve plant growth and health, understanding how to modulate microbial communities will help in developing smart farming and favor plant growth-promoting (PGP) microorganisms. With tremendous cost cuts in NGS technologies, metagenomic approaches are now affordable and have been widely used to investigate crop-associated microbiomes. Being able to engineer microbial communities in ways that benefit crop health and growth will help decrease the number of chemical inputs required. Against this background, this review explores the impacts of agricultural practices on soil- and plant-associated microbiomes, focusing on plant growth-promoting microorganisms from a metagenomic perspective.

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“…These studies highlight the opportunity for in situ extraction from agricultural regions overlying P-rich bedrock where granules of underlying rock fragments are mixed with the upper productive soil horizons. In these cases, nutrient delivery could be achieved through inoculation with active bacterial and fungal strains [52,53].…”

Section: Geological P Prospectsmentioning

confidence: 99%

Geo-Agriculture: Reviewing Opportunities through Which the Geosphere Can Help Address Emerging Crop Production Challenges

et al. 2020

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The agricultural sector faces looming challenges including dwindling fertiliser reserves, environmental impacts of conventional soil inputs, and increasingly difficult growing conditions wrought by climate change. Naturally-occurring rocks and minerals may help address these challenges. In this case, we explore opportunities through which the geosphere could support viable agricultural systems, primarily via a literature review supplemented by data analysis and preliminary-scale experimentation. Our objective is to focus on opportunities specifically relating to emerging agricultural challenges. Our findings reveal that a spectrum of common geological materials can assist across four key agricultural challenges: 1. Providing environmentally-sustainable fertiliser deposits especially for the two key elements in food production, nitrogen (via use of slow release N-rich clays), and phosphorus (via recovery of the biomineral struvite) as well as through development of formulations to tap into mineral nutrient reserves underlying croplands. 2. Reducing contamination from farms—using clays, zeolites, and hydroxides to intercept, and potentially recycle nutrients discharged from paddocks. 3. Embedding drought resilience into agricultural landscapes by increasing soil moisture retention (using high surface area minerals including zeolite and smectite), boosting plant availability of drought protective elements (using basalts, smectites, and zeolites), and decreasing soil surface temperature (using reflective smectites, zeolites, and pumices), and 4. mitigating emissions of all three major greenhouse gases—carbon dioxide (using fast-weathering basalts), methane (using iron oxides), and nitrous oxide (using nitrogen-sorbing clays). Drawbacks of increased geological inputs into agricultural systems include an increased mining footprint, potential increased loads of suspended sediments in high-rainfall catchments, changes to geo-ecological balances, and possible harmful health effects to practitioners extracting and land-applying the geological materials. Our review highlights potential for ‘geo-agriculture’ approaches to not only help meet several key emerging challenges that threaten sustainable food and fiber production, but also to contribute to achieving some of the United Nations Sustainable Development Goals—‘Zero Hunger,’ ‘Life on Land,’ and ‘Climate Action.’

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Effects of commercial microbial biostimulants on soil and root microbial communities and sugarcane yield

Cited by 29 publications

References 101 publications

Field Site-Specific Effects of an Azospirillum Seed Inoculant on Key Microbial Functional Groups in the Rhizosphere

Field Site-Specific Effects of an Azospirillum Seed Inoculant on Key Microbial Functional Groups in the Rhizosphere

Plant Microbiota Beyond Farming Practices: A Review

Geo-Agriculture: Reviewing Opportunities through Which the Geosphere Can Help Address Emerging Crop Production Challenges

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