Bacterial and fungal communities vary with the type of organic substrate: implications for biocontrol of soilless crops

Montagne, Virginie; Capiaux, Hervé; Barret, Matthieu; Cannavo, Patrice; Charpentier, Sylvain; Grosbellet, C.; Lebeau, Thierry

doi:10.1007/s10311-017-0628-0

Cited by 33 publications

(44 citation statements)

References 27 publications

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“…Though they seem to hold good potential for disease control and prevention in aquaponics (Montagne et al . 2017; Stouvenakers et al . 2019), but there is currently limited information on the specific taxonomic identification of the microbial phyla and the possible usage characteristics.…”

Section: Resultsmentioning

confidence: 99%

Integrated pest and disease management in aquaponics: A metadata‐based review

Folorunso

Roy

Gebauer

et al. 2020

Reviews in Aquaculture

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Aquaponics has the potential to produce sustainable, high‐quality food through integration of hydroponics and aquaculture, but its commercialization is stalled by bottlenecks in pest and disease management. We reviewed integrated pest and disease management steps and techniques in hydroponics to qualify as suitable techniques for different aquaponic designs. Non‐chemical prophylactic measures are highly proficient for pest and disease prevention in all designs. Still, the use of chemical control methods remains highly complicated for all systems. We simulated 10–20% runoff concentrations of 9 pesticides in the common UVI design and compared them with NOEC, LC50 of fish. Endosulfan seems most toxic with runoff AI (20.7 μg L−1) exceeding LC50 (10.2 μg L−1) and NOEC (0.05 μg L−1). At 20% runoff, most chemical pesticides pose risks in aquaponic systems. Natural pesticides were also discussed as potential alternatives with low acute toxicity to fish, but little is known about their effects on water and bacteria. While insecticides and herbicides are replaceable by well‐established commercial biocontrol measures, fungicides and nematicides would still be relevant in aquaponics due to low efficiency of alternatives (e.g. natural enemies, entomopathogenic fungus). Monitoring and cultural control are the first approaches to contain pest population below the action threshold. Biological controls, in general, are adaptable to a larger extent. Further studies are required on how to utilize indigenous microbial community in aquaponics (dominated by Proteobacteria; effective at ~103–109 CFU mL−1) as a frontline defence.

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Section: Resultsmentioning

confidence: 99%

Integrated pest and disease management in aquaponics: A metadata‐based review

Folorunso

Roy

Gebauer

et al. 2020

Reviews in Aquaculture

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“…Theoretically all these characteristics allow a better introduction, establishment and interaction of the BCA with plants in hydroponics than in soil (Paulitz and Bélanger 2001;Postma et al 2009;Vallance et al 2010). However, in practice, the effectiveness of BCA inoculation to control root pathogens can be highly variable in soilless systems (Postma et al 2008;Vallance et al 2010;Montagne et al 2017). One explanation for this is that BCA selection is based on in vitro tests which are not representing real conditions and subsequently a weak adaptation of these microorganisms to the aquatic environment used in hydroponics or aquaponics (Postma et al 2008;Vallance et al 2010).…”

Section: Induction Of Diseases Resistance In Plantsmentioning

confidence: 99%

“…Although some microorganisms are efficient at controlling root pathogens, there are other problems that need to be overcome in order to produce a biopesticide. The main challenges are to determine the means of inoculation, the inoculum density, the product formulation (Montagne et al 2017), the method for the production of sufficient quantity at low cost and the storage of the formulated product. Ecotoxicological studies on fish and living beneficial microorganisms in the system are also an important point.…”

Section: Induction Of Diseases Resistance In Plantsmentioning

confidence: 99%

“…Consequently, the characteristics of the media will influence microbial richness and functions. The choice of a specific plant media could therefore influence the microbial development so as to have a suppressive effect on pathogens (Montagne et al 2015;Grunert et al 2016;Montagne et al 2017). Another possibility of pathogen suppression related to organic carbon is the use of organic amendments in hydroponics (Maher et al 2008;Vallance et al 2010).…”

Section: The Role Of Organic Matter In Biocontrol Activity In Aquaponmentioning

confidence: 99%

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Plant Pathogens and Control Strategies in Aquaponics

Stouvenakers

Dapprich

Massart

et al. 2019

Aquaponics Food Production Systems

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Among the diversity of plant diseases occurring in aquaponics, soil-borne pathogens, such as Fusarium spp., Phytophthora spp. and Pythium spp., are the most problematic due to their preference for humid/aquatic environment conditions. Phytophthora spp. and Pythium spp. which belong to the Oomycetes pseudo-fungi require special attention because of their mobile form of dispersion, the so-called zoospores that can move freely and actively in liquid water. In coupled aquaponics, curative methods are still limited because of the possible toxicity of pesticides and chemical agents for fish and beneficial bacteria (e.g. nitrifying bacteria of the biofilter). Furthermore, the development of biocontrol agents for aquaponic use is still at its beginning. Consequently, ways to control the initial infection and the progression of a disease are mainly based on preventive actions and water physical treatments. However, suppressive action (suppression) could happen in aquaponic environment considering recent papers and the suppressive activity already highlighted in hydroponics. In addition, aquaponic water contains organic matter that could promote establishment and growth of heterotrophic bacteria in the system or even improve plant growth and viability directly. With regards to organic hydroponics (i.e. use of organic fertilisation and organic plant media), these bacteria could act as antagonist agents or as plant defence elicitors to protect plants from diseases. In the future, research on the disease suppressive ability of the aquaponic biotope must be increased, as well as isolation, characterisation and formulation of microbial plant pathogen antagonists. Finally, a good knowledge in the rapid identification of pathogens, combined with control methods and diseases monitoring, as recommended in integrated plant pest management, is the key to an efficient control of plant diseases in aquaponics.

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“…Unfortunately, most biostimulant research has focused on field crops, and the efficacy of these products in greenhouse production can be highly variable (Paulitz and Richard, 2001;Ngumbi and Kloepper, 2016). Noteable differences in greenhouse production compared to field production are the use of soilless media with less biodiversity, production in containerized systems, and increased frequency of fertilizer application (Montagne et al, 2017). Microbial inoculants have been isolated from a variety of natural environments, most of which are drastically different than controlled environment greenhouse production systems.…”

Section: Introductionmentioning

confidence: 99%

Isolation of Rhizosphere Bacteria That Improve Quality and Water Stress Tolerance in Greenhouse Ornamentals

Nordstedt

Jones

2020

Front. Plant Sci.

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Water deficit stress is a major contributor to the loss of ornamental crop value due to its negative effects on plant growth and flowering. In addition, post-production water stress can reduce the photosynthetic capacity of plants, negatively impacting crop quality at retail and in the consumer's home and garden. While the application of microbecontaining biostimulant products can increase stress tolerance and crop quality, the success of most commercially available biostimulants in greenhouse production systems is inconsistent. To identify beneficial bacteria with consistent biostimulant activity in greenhouse ornamentals, our study isolated bacteria from the rhizosphere of water stressed greenhouse ornamentals. Five species of popular ornamentals were obtained from 15 different commercial greenhouse facilities and then subjected to three cycles of water stress. Over 1,000 bacterial isolates were collected from the rhizosphere and screened in vitro for osmoadaptability and 1-aminocyclopropane-1carboxylate (ACC) deaminase activity. Eighty selected isolates were evaluated in a high-throughput greenhouse trial for their ability to increase plant size and flower number of water-stressed Petunia × hybrida. Ten bacterial strains selected from the highthroughput trial were then evaluated in a greenhouse validation trial for their ability to increase plant growth and to mitigate the reduction in photosynthetic parameters of water stressed P. hybrida and Pelargonium × hortorum. Application of certain bacteria increased plant size in both species and flower number of P. hybrida after recovery from water stress when compared to untreated water stressed plants. In addition, bacteria application increased the chlorophyll fluorescence parameters including quantum yield and efficiency of photosystem II (PSII) and electron transport rate (ETR), while decreasing the extent of electrolyte leakage during water stress and recovery. Overall, this study identified bacterial strains that can increase tolerance to and recovery from water stress in two commercially important ornamental crop species.

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Bacterial and fungal communities vary with the type of organic substrate: implications for biocontrol of soilless crops

Cited by 33 publications

References 27 publications

Integrated pest and disease management in aquaponics: A metadata‐based review

Integrated pest and disease management in aquaponics: A metadata‐based review

Plant Pathogens and Control Strategies in Aquaponics

Isolation of Rhizosphere Bacteria That Improve Quality and Water Stress Tolerance in Greenhouse Ornamentals

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