Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.13
E. Monte, R. Hermosa
Trichoderma is one of the most studied genera of ascomycetous fungi due to the beneficial effects it has on plants. Trichoderma spp. are involved in the production of cell wall-degrading enzymes and metabolites with antimicrobial activity. It also produces volatile compounds that act together as direct biocontrol agents to protect plants against phytopathogenic fungi, oomycetes, nematodes and bacteria. Trichoderma spp. can also compete in the rhizosphere for space and nutrients while it can also protect plants by activating systemic immune responses that result in a faster and stronger induction of plant basal resistance mechanisms against biotic and abiotic stresses. The possibility that Trichoderma can also promote plant growth opens new opportunities to register strains as biostimulants. Adequate registration procedures are urgently needed as there is no appropriate legal framework for registering Trichoderma as both plant protection products and as biofertilizers.
{"title":"The use of Trichoderma spp. to control plant diseases","authors":"E. Monte, R. Hermosa","doi":"10.19103/as.2021.0093.13","DOIUrl":"https://doi.org/10.19103/as.2021.0093.13","url":null,"abstract":"Trichoderma is one of the most studied genera of ascomycetous fungi due to the beneficial effects it has on plants. Trichoderma spp. are involved in the production of cell wall-degrading enzymes and metabolites with antimicrobial activity. It also produces volatile compounds that act together as direct biocontrol agents to protect plants against phytopathogenic fungi, oomycetes, nematodes and bacteria. Trichoderma spp. can also compete in the rhizosphere for space and nutrients while it can also protect plants by activating systemic immune responses that result in a faster and stronger induction of plant basal resistance mechanisms against biotic and abiotic stresses. The possibility that Trichoderma can also promote plant growth opens new opportunities to register strains as biostimulants. Adequate registration procedures are urgently needed as there is no appropriate legal framework for registering Trichoderma as both plant protection products and as biofertilizers.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116250786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.16
R. Bandyopadhyay, A. Ortega‐Beltran, M. Konlambigue, L. Kaptoge, Titilayo D O Falade, P. Cotty
Aflatoxins pose a significant public health risk, decrease productivity and profitability and hamper trade. To minimize aflatoxin contamination a biocontrol technology based on atoxigenic strains of Aspergillus flavus that do not produce aflatoxin is used widely in the United States. The technology, with the generic name Aflasafe, has been improved and adapted for use in Africa. Aflasafe products have been developed or are currently being developed in 20 African countries. Aflatoxin biocontrol is being scaled up for use in several African countries through a mix of public, private, and public-private interventions. Farmers in several countries have commercially treated nearly 400,000 ha of maize and groundnut achieving >90% reduction in aflatoxin contamination. This chapter summarizes the biology of aflatoxin-producing fungi and various factors affecting their occurence, including climate change. Various management practices for aflatoxin mitigation are then discussed. These include biological control, which is increasingly being adopted by farmers in several countries. We discuss biocontrol product development and commercialization in various African countries. Subsequently, we highlight some barriers to adoption and other challenges.
{"title":"Development and scale-up of bioprotectants to keep staple foods safe from aflatoxin contamination in Africa","authors":"R. Bandyopadhyay, A. Ortega‐Beltran, M. Konlambigue, L. Kaptoge, Titilayo D O Falade, P. Cotty","doi":"10.19103/as.2021.0093.16","DOIUrl":"https://doi.org/10.19103/as.2021.0093.16","url":null,"abstract":"Aflatoxins pose a significant public health risk, decrease productivity and profitability and hamper trade. To minimize aflatoxin contamination a biocontrol technology based on atoxigenic strains of Aspergillus flavus that do not produce aflatoxin is used widely in the United States. The technology, with the generic name Aflasafe, has been improved and adapted for use in Africa. Aflasafe products have been developed or are currently being developed in 20 African countries. Aflatoxin biocontrol is being scaled up for use in several African countries through a mix of public, private, and public-private interventions. Farmers in several countries have commercially treated nearly 400,000 ha of maize and groundnut achieving >90% reduction in aflatoxin contamination. This chapter summarizes the biology of aflatoxin-producing fungi and various factors affecting their occurence, including climate change. Various management practices for aflatoxin mitigation are then discussed. These include biological control, which is increasingly being adopted by farmers in several countries. We discuss biocontrol product development and commercialization in various African countries. Subsequently, we highlight some barriers to adoption and other challenges.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126676896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.07
R. Hauschild, W. Ravensberg
Microbial bioprotectants, like chemical pesticides, are required to pass a risk assessment and risk management procedure prior to use in plant protection, which in many countries is an obstacle for market access, in particular, the European Union. Administrative issues and data requirements, adapted from those used for chemicals, cause issues for both applicants and evaluators. These issues are reviewed and improvements are proposed. Biology should be the basis of the evaluation and data requirements for microorganisms, with an emphasis in this chapter on microbial compounds and testing methods. Political actions involving the use of pesticides are reviewed and recommendations are made on how to improve the system for microbial bioprotectants, including new uses. New legislation is suggested for all microorganisms used in agriculture and related uses based on the assumption that well-known microorganisms are of low risk to human health and the environment.
{"title":"Key issues in the regulation of microbial bioprotectants in the European Union: challenges and solutions to achieve more sustainable crop protection","authors":"R. Hauschild, W. Ravensberg","doi":"10.19103/as.2021.0093.07","DOIUrl":"https://doi.org/10.19103/as.2021.0093.07","url":null,"abstract":"Microbial bioprotectants, like chemical pesticides, are required to pass a risk assessment and risk management procedure prior to use in plant protection, which in many countries is an obstacle for market access, in particular, the European Union. Administrative issues and data requirements, adapted from those used for chemicals, cause issues for both applicants and evaluators. These issues are reviewed and improvements are proposed. Biology should be the basis of the evaluation and data requirements for microorganisms, with an emphasis in this chapter on microbial compounds and testing methods. Political actions involving the use of pesticides are reviewed and recommendations are made on how to improve the system for microbial bioprotectants, including new uses. New legislation is suggested for all microorganisms used in agriculture and related uses based on the assumption that well-known microorganisms are of low risk to human health and the environment.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"2672 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133917813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.05
M. Bardin, Thomas Pressecq, P. Nicot, Yousra Bouaoud
Plant pathogens can develop resistance to conventional plant protection products but their ability to overcome the effect of microbial bioprotectants is still poorly known. However, various studies show that susceptibility of plant pathogens to microbial bioprotectants can be highly variable. This may contribute to the inconsistent efficacy of microbial bioprotectants sometimes observed in the field. An important question is whether the widespread use of microbial bioprotectants in the field could conduct to the selection of even more resistant phenotypes of plant pathogens. This chapter highlights current knowledge concerning erosion of microbial bioprotectants against plant pathogens and its possible consequences for field efficacy.
{"title":"Durability of efficacy of microbial bioprotectants against plant diseases","authors":"M. Bardin, Thomas Pressecq, P. Nicot, Yousra Bouaoud","doi":"10.19103/as.2021.0093.05","DOIUrl":"https://doi.org/10.19103/as.2021.0093.05","url":null,"abstract":"Plant pathogens can develop resistance to conventional plant protection products but their ability to overcome the effect of microbial bioprotectants is still poorly known. However, various studies show that susceptibility of plant pathogens to microbial bioprotectants can be highly variable. This may contribute to the inconsistent efficacy of microbial bioprotectants sometimes observed in the field. An important question is whether the widespread use of microbial bioprotectants in the field could conduct to the selection of even more resistant phenotypes of plant pathogens. This chapter highlights current knowledge concerning erosion of microbial bioprotectants against plant pathogens and its possible consequences for field efficacy.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133027944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.04
S. Compant, G. Brader, A. Sessitsch
Plants contain diverse microorganisms that interact with their hosts and with each other. Beneficial bacteria can be utilised on crops to protect plants against biotic and abiotic stresses and to stimulate plant growth. However, the behaviour of specific microorganisms on and within plants is still underexplored. Knowledge of bacterial colonisation behaviour and the precise ecological niches in a natural environment of a target strain can lead to better application and utilisation of these microorganisms for crop enhancement, in different plant soil environments, and for both biocontrol and biofertilisation approaches in organic and integrated protection systems. Understanding colonisation characteristics will also provide information on putative new strategies for maximising inoculation efficiency and thus crop enhancement. In this chapter, we set out how beneficial bacteria can colonise their host plants under various conditions and demonstrate how an understanding of plant colonisation can be used to improve bacterial application approaches.
{"title":"Visualising plant colonisation by beneficial bacteria: a key step to improve the understanding of plant–microbe interactions","authors":"S. Compant, G. Brader, A. Sessitsch","doi":"10.19103/as.2021.0093.04","DOIUrl":"https://doi.org/10.19103/as.2021.0093.04","url":null,"abstract":"Plants contain diverse microorganisms that interact with their hosts and with each other. Beneficial bacteria can be utilised on crops to protect plants against biotic and abiotic stresses and to stimulate plant growth. However, the behaviour of specific microorganisms on and within plants is still underexplored. Knowledge of bacterial colonisation behaviour and the precise ecological niches in a natural environment of a target strain can lead to better application and utilisation of these microorganisms for crop enhancement, in different plant soil environments, and for both biocontrol and biofertilisation approaches in organic and integrated protection systems. Understanding colonisation characteristics will also provide information on putative new strategies for maximising inoculation efficiency and thus crop enhancement. In this chapter, we set out how beneficial bacteria can colonise their host plants under various conditions and demonstrate how an understanding of plant colonisation can be used to improve bacterial application approaches.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116494602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-23DOI: 10.19103/as.2021.0093.18
M. Choudhary, M. Paret, A. Obradović, K. Gašić, Jeffrey B. Jones
Crop yield loss due to bacterial plant pathogens need to be reduced to increase global food production demand. Currently available disease management strategies involving copper-based bactericides and antibiotics are losing efficacy due to development of resistance in bacteria. There is long familiar demand of environmentally friendly and sustainable strategies to control bacterial diseases. Bacteriophages are virus that kill target bacteria without affecting another microorganism and environment. Bacteriophage efficiency on phyllosphere is mainly affected by ultraviolet (UV) light. Use of combination of phage, mixture with phage carrier bacteria and optimizing time of application helps in persistence of bacteriophage. There are several bacteriophage products already available in the market to control destructive bacterial diseases. Unlike chemical based traditional control measure, bacteriophage mixture can be easily amended to reduce resistance development in bacteria. In this chapter, the authors discuss from phage isolation to interaction with bacteria and control mechanism of plant diseases.
{"title":"Bacteriophages to control plant diseases","authors":"M. Choudhary, M. Paret, A. Obradović, K. Gašić, Jeffrey B. Jones","doi":"10.19103/as.2021.0093.18","DOIUrl":"https://doi.org/10.19103/as.2021.0093.18","url":null,"abstract":"Crop yield loss due to bacterial plant pathogens need to be reduced to increase global food production demand. Currently available disease management strategies involving copper-based bactericides and antibiotics are losing efficacy due to development of resistance in bacteria. There is long familiar demand of environmentally friendly and sustainable strategies to control bacterial diseases. Bacteriophages are virus that kill target bacteria without affecting another microorganism and environment. Bacteriophage efficiency on phyllosphere is mainly affected by ultraviolet (UV) light. Use of combination of phage, mixture with phage carrier bacteria and optimizing time of application helps in persistence of bacteriophage. There are several bacteriophage products already available in the market to control destructive bacterial diseases. Unlike chemical based traditional control measure, bacteriophage mixture can be easily amended to reduce resistance development in bacteria. In this chapter, the authors discuss from phage isolation to interaction with bacteria and control mechanism of plant diseases.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127210642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-16DOI: 10.19103/as.2021.0093.10
Adrien Anckaert, Anthony Arguelles Arias, G. Hoff, Maryline Calonne-Salmon, S. Declerck, M. Ongena
Biocontrol agents (BCAs) based on plant growth promoting rhizobacteria have recently been developed as alternatives to chemical pesticides. Among those beneficial bacteria, Bacillus spp. are one of the most promising BCAs. A wide range of bioactive secondary metabolites (BSMs) are involved in biocontrol via antibiosis to phytopathogens and/or via elicitation of systemic resistance in their host plants. This chapter illustrates the diversity of pathosystems in which BCA based on Bacillus spp. have proved effective. It describes the mechanisms underpinning this biocontrol activity via production of a wide range of enzymes, proteins and small-size BSMs. As these BSMs are clearly involved in pathogen control, we emphasise the importance of understanding the ecological factors influencing their production. In the last part of the chapter, we highlight the potential interactions between Bacillus spp. and other soil microorganisms in developing consortia of biocontrol agents combining species with synergistic activities for plant health improvement.
{"title":"The use of Bacillus spp. as bacterial biocontrol agents to control plant diseases","authors":"Adrien Anckaert, Anthony Arguelles Arias, G. Hoff, Maryline Calonne-Salmon, S. Declerck, M. Ongena","doi":"10.19103/as.2021.0093.10","DOIUrl":"https://doi.org/10.19103/as.2021.0093.10","url":null,"abstract":"Biocontrol agents (BCAs) based on plant growth promoting rhizobacteria have recently been developed as alternatives to chemical pesticides. Among those beneficial bacteria, Bacillus spp. are one of the most promising BCAs. A wide range of bioactive secondary metabolites (BSMs) are involved in biocontrol via antibiosis to phytopathogens and/or via elicitation of systemic resistance in their host plants. This chapter illustrates the diversity of pathosystems in which BCA based on Bacillus spp. have proved effective. It describes the mechanisms underpinning this biocontrol activity via production of a wide range of enzymes, proteins and small-size BSMs. As these BSMs are clearly involved in pathogen control, we emphasise the importance of understanding the ecological factors influencing their production. In the last part of the chapter, we highlight the potential interactions between Bacillus spp. and other soil microorganisms in developing consortia of biocontrol agents combining species with synergistic activities for plant health improvement.","PeriodicalId":346804,"journal":{"name":"Microbial bioprotectants for plant disease management","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129289380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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