Screening for novel biocontrol agents applicable in plant disease management – A review

Raymaekers, Katrijn; Ponet, Lisa; Holtappels, Dominique; Berckmans, Barbara; Cammue, Bruno P. A.

doi:10.1016/j.biocontrol.2020.104240

Cited by 183 publications

(102 citation statements)

References 190 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These protective mechanisms of direct BCAs are often complex and rely on different and multifaceted modes of action, which is expected to lower the chances of resistance development. Another advantage of direct BCAs includes the possibility to investigate inhibitory effects via simple bioassays between only the antagonist and the pathogen, which is more straightforward than investigating indirect effects between the pathogen, inducer of resistance and the plant [20]. Despite this, complete disease control can only be obtained when BCAs are combined with fungicides [39].…”

Section: Combinations Of Fungicides With Biological Antagonistsmentioning

confidence: 99%

“…The characteristics of BCAs are dependent on their origin, either chemical or biological, and their mode of action, either direct or indirect (Table 2). For example, screening for BCAs that induce resistance requires more complicated assays on plants than screening for direct BCAs, which is usually possible in vitro [20]. Moreover, BCAs that enhance the activity of fungicides should be compatible.…”

Section: Future Perspectivesmentioning

confidence: 99%

“…This broader term includes the application of living organisms and their derivatives to control plant diseases and pests, not only via direct antagonistic effects against plant pathogens and pests but also indirectly via the induction of resistance [19]. The differences with the narrow definition of biocontrol are therefore that derivatives of living organisms and inducers of resistance, which activate the defense mechanisms of plants, are also defined as biocontrol agents (BCAs) [20]. Examples include parasitoid wasps, predatory mites against several pests such as potato tuber moth and pathogenic bacteria and fungi, like Bacillus spp.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Combining Biocontrol Agents with Chemical Fungicides for Integrated Plant Fungal Disease Control

et al. 2020

Self Cite

View full text Add to dashboard Cite

Feeding a rising population of currently 7.8 billion people globally requires efficient agriculture, which is preferably sustainable. Today, farmers are largely dependent on synthetic fungicides to avoid food losses caused by fungal diseases. However, the extensive use of these has resulted in the emergence of fungicide-resistant pathogens and concerns have been raised over the residual effects on the environment and human health. In this regard, biocontrol agents (BCAs) have been proposed as an alternative to standard fungicides but their disease management capacity is usually incomplete and heavily relies on uncontrollable environmental conditions. An integrated approach combining BCAs with fungicides, which is the focus of this review, is put forward as a way to reduce the fungicide doses to manage plant diseases and thereby their residue on harvested crops. In addition, such a strategy of combining antifungal treatments with different modes of action reduces the selection pressure on pathogens and thereby the chances of resistance development. However, to allow its large-scale implementation, further knowledge is needed, comprising timing, number and interval of repeated BCA applications and their compatibility with fungicides. The compatibility of BCAs with fungicides might differ when applied in a mixture or when used in alternation.

show abstract

Section: Combinations Of Fungicides With Biological Antagonistsmentioning

confidence: 99%

Section: Future Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combining Biocontrol Agents with Chemical Fungicides for Integrated Plant Fungal Disease Control

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, its mechanism of antifungal action has not been fully elucidated. Therefore, the objective of this study was (1) to evaluate the antagonistic effects of stain ETR-B22; (2) to assess broad-spectrum antifungal effects of VOCs produced by strainETR-B22; (3) to identify and characterize the composition of the VOCs; and (4) to determine the chemical factors in pathogen inhibition.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Volatile Organic Compounds Emitted from Endophytic Burkholderia cenocepacia ETR-B22 by SPME-GC-MS and Their Inhibitory Activity against Various Plant Fungal Pathogens

et al. 2020

View full text Add to dashboard Cite

The use of antagonistic microorganisms and their volatile organic compounds (VOCs) to control plant fungal pathogens is an eco-friendly and promising substitute for chemical fungicides. In this work, endophytic bacterium ETR-B22, isolated from the root of Sophora tonkinensis Gagnep., was found to exhibit strong antagonistic activity against 12 fungal pathogens found in agriculture. Strain ETR-B22 was identified as Burkholderia cenocepacia based on 16S rRNA and recA sequences. We evaluated the antifungal activity of VOCs emitted by ETR-B22. The VOCs from strain ETR-B22 also showed broad-spectrum antifungal activity against 12 fungal pathogens. The composition of the volatile profiles was analyzed based on headspace solid phase microextraction (HS-SPME) gas chromatography coupled to mass spectrometry (GC-MS). Different extraction strategies for the SPME process significantly affected the extraction efficiency of the VOCs. Thirty-two different VOCs were identified. Among the VOC of ETR-B22, dimethyl trisulfide, indole, methyl anthranilate, methyl salicylate, methyl benzoate, benzyl propionate, benzyl acetate, 3,5-di-tert-butylphenol, allyl benzyl ether and nonanoic acid showed broad-spectrum antifungal activity, and are key inhibitory compounds produced by strain ETR-B22 against various fungal pathogens. Our results suggest that the endophytic strain ETR-B22 and its VOCs have high potential for use as biological controls of plant fungal pathogens.

show abstract

“…It has become evident that PGPMs will not be effective for an extended time unless the environment is modified to make it more conducive for their growth and survival (Pagliaccia et al, 2007(Pagliaccia et al, , 2008Zhou et al, 2020). On the other hand, it might not be necessary to introduce foreign microorganisms (i.e., inoculant) since soils already hold a vast reservoir of microbes, and plants can enrich their own root-associated microbiome which can function as biocontol agents and PGPMs (Pagliaccia et al, 2007;Lebeis, 2015;Reinhold-Hurek et al, 2015;Lareen et al, 2016;Timmusk et al, 2017;Zhang et al, 2017;Köhl et al, 2019;Raymaekers et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Two Food Waste By-Products Selectively Stimulate Beneficial Resident Citrus Host-Associated Microbes in a Zero-Runoff Indoor Plant Production System

Pagliaccia

Bodaghi

Chen

et al. 2020

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

The global production of food waste is a far-reaching problem with sizable financial, ethical, social, and environmental costs. Over 66 million tons of food waste is produced annually in the United States alone. This waste can be converted into valuable digestate by-products that promote a circular economy within agri-food systems. The present work investigated the use of two liquid digestates of microaerobic fermentation from mixed food waste and beer mash, respectively, as biostimulants for non-bearing citrus plants (nursery stock) grown in a zero-runoff greenhouse system with recirculating irrigation. The digestates' impact on the structure and diversity of the microbiota was determined on the irrigation water, soil, leaves, roots, and rhizosphere of citrus plants. A combination of culture-dependent (selective media) and culture-independent approaches (Next-Generation Sequencing) was used to assess the composition of the microbial communities and to single out the presence of foodborne pathogens. Our results suggest that the use of digestates is safe (i.e., no human or plant pathogens were present in the digestates or enriched in the plant production system following amendments). Digestates application to the irrigation water reduced the bacterial diversity within 24–48 h and selectively and significantly stimulated beneficial resident host-associated microorganisms (Pseudomonas putida) by two to three orders of magnitude. Carbon dynamics were analyzed in the nutrient solutions by measuring dissolved organic carbon and characterizing carbon species through gas chromatography-electron ionization-mass spectrometry. Our results indicate that dissolved organic carbon in the recirculating irrigation water spikes after each digestate amendment and it is quickly metabolized by bacteria, plateauing 24 h after application. Soil carbon, nitrogen, and nutrient dynamics were also analyzed, and results suggest that digestates increased the concentration of some plant nutrients in soils without causing a surge of potentially toxic elements. This study represents a proof-of-concept for the safe re-use of organic wastes, from farming and consumers, in agriculture. Implementing this type of integrated plant production system could reduce the environmental impact of food waste and benefit the public by improving soil health, reducing agricultural footprint, and increasing crop fitness by deploying a method based on a circular economy and sustainable food production approaches.

show abstract

Screening for novel biocontrol agents applicable in plant disease management – A review

Cited by 183 publications

References 190 publications

Combining Biocontrol Agents with Chemical Fungicides for Integrated Plant Fungal Disease Control

Combining Biocontrol Agents with Chemical Fungicides for Integrated Plant Fungal Disease Control

Characterization of Volatile Organic Compounds Emitted from Endophytic Burkholderia cenocepacia ETR-B22 by SPME-GC-MS and Their Inhibitory Activity against Various Plant Fungal Pathogens

Two Food Waste By-Products Selectively Stimulate Beneficial Resident Citrus Host-Associated Microbes in a Zero-Runoff Indoor Plant Production System

Contact Info

Product

Resources

About