Improving the efficacy of biocontrol agents against soilborne pathogens

Spadaro, D.; Gullino, M. L.

doi:10.1016/j.cropro.2004.11.003

Cited by 239 publications

(124 citation statements)

References 103 publications

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“…when it comes to safety. Many well studied fungi such as F. oxysporum are pathogenic and therefore might pose a safety risk [53]. Trichoderma asperellum and Trichoderma reesei are both fungi that produce AgNPs when exposed to silver salts [44,54] and have been proven to be nonpathogenic which makes them ideal for use commercially [54,55].…”

Section: Nanoparticle Synthesis By Fungimentioning

confidence: 99%

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Pantidos¹

2014

J Nanomed Nanotechnol

464

221

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Over the past few decades interest in metallic nanoparticles and their synthesis has greatly increased. This has resulted in the development of numerous ways of producing metallic nanoparticles using chemical and physical methods. However, drawbacks such as the involvement of toxic chemicals and the high-energy requirements of production make it difficult for them to be widely implemented. An alternative way of synthesising metallic nanoparticles is by using living organisms such as bacteria, fungi and plants. This "green" method of biological nanoparticle production is a promising approach that allows synthesis in aqueous conditions, with low energy requirements and low-costs. This review gives an overview of some of these environmentally friendly methods of biological metallic nanoparticle synthesis. It also highlights the potential importance of these methods in assessing nanoparticle risk to both health and the environment.techniques, which are generally low-cost and high-volume. However, the need for toxic solvents and the contamination from chemicals used in nanoparticle production limit their potential use in biomedical applications [15]. Therefore a "green", non-toxic way of synthesising metallic nanoparticles is needed in order to allow them to be used in a wider range of industries. This could potentially be achieved by using biological methods.Many bacteria, fungi and plants have shown the ability to synthesise metallic nanoparticles and all have their own advantages and disadvantages (Table 1) [16][17][18]. Intracellular or extracellular synthesis, growth temperature, synthesis time, ease of extraction and percentage synthesised versus percentage removed from sample ratio, all play an important role in biological nanoparticle production. Finding the right biological method can depend upon a number of variables. Most importantly, the type of metal nanoparticle under investigation is of vital consideration, as in general organisms have developed resistance against a small number of metals, potentially limiting the choice of organism. However synthetic biology; a nascent field of science, is starting to address these issues in order to create more generalised chassis, able to synthesise more than one type of metallic nanoparticle using the same organism [19]."Natural" biogenic metallic nanoparticle synthesis can be split into two categories. The first is bioreduction, in which metal ions are chemically reduced into more stable forms biologically. Many organisms have the ability to utilise dissimilatory metal reduction, in which the reduction of a metal ion is coupled with the oxidation of an enzyme [20]. This results in stable and inert metallic nanoparticles that can then be safely removed from a contaminated sample. The second category is biosorption. This involves the binding of metal ions from Journal of Nanomedicine & Nanotechnology J o u rna l of N a n o m ed icine & N a n o te chnolo g y

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Section: Nanoparticle Synthesis By Fungimentioning

confidence: 99%

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Pantidos¹

2014

J Nanomed Nanotechnol

464

221

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“…Bio-inoculants like bacterial antagonists can play a vital role in such approaches, and could emphasize the extended protection to the commodity through spatial competition, antibiosis and induction of defense pathways (Manikandan & Raguchander 2014). Combining different biocontrol agents can contribute to better control of pathogens (Spadaro & Gullino 2005). Recent study imply that combined application of bacterial antagonists like P. fluorescens, B. subtilis with hexanal drastically reduced the pathogen population in vitro and strengthen the cell wall structures resulting in restriction of pathogen infection (Ahemad & Kibret 2014;Wang et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Bacterial antagonists and hexanal-induced systemic resistance of mango fruits against Lasiodiplodia theobromae causing stem-end rot

Seethapathy

Thiribhuvanamala

Subramanian

et al. 2016

Journal of Plant Interactions

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Induction of defense-related enzymes, such as phenylalanine ammonia lyase (PAL), peroxidase (PO), polyphenol oxidase (PPO), superoxide dismutase (SOD) and catalase (CAT) due to bacterial antagonists viz., Pseudomonas fluorescens (Pf1) and Bacillus subtilis (EPCO16) and plant-derived lipoxygenase volatile compound hexanal, were studied in mango fruits against Lasiodiplodia theobromae causing stem-end rot disease. The results showed increased induction of all the defense-related enzymes in mango fruits 3-5 days after dipping treatment with combination of bacterial antagonists and hexanal when compared to untreated control treatment and treatment with fungicide carbendazim in storage condition. The increased activity was observed up to 3 days after treatment and thereafter declined. Further, increased expression of specific isoforms of PO, PPO, SOD and CAT were also observed in the treatment effect of P. fluorescens (0.5%) + hexanal (0.02%) treated fruits against L. theobromae. From the results obtained, it is inferred that due to the enhancement of defense-related enzymes via the phenylpropanoid pathway and due to secretion of secondary metabolites that would play significant role in hindering the pathogen quiescence and further invasion in mango fruits and thereby prevent the fruit rot.ARTICLE HISTORY

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“…Doses reduzidas de fungicidas podem estressar e enfraquecer o patógeno e tornar seus propágulos mais suscetíveis ao ataque subseqüente pelo antagonista (Spadaro & Gullino, 2005).…”

Section: Introductionunclassified

“…Esses produtos foram utilizados nas doses equivalentes a um terço das concentrações recomendadas, pois em testes prévios notou-se a inibição total de crescimento do agente de biocontrole, quando foi adicionada a dose recomendada do produto. Baixas doses de fungicidas (e de inseticidas, em menor grau) podem funcionar como fator de estresse e, dessa forma, tornar o patógeno mais vulnerável ao antagonista (Spadaro & Gullino, 2005). Cada produto foi adicionado em frascos individuais, com meio à base de batatadextrose-ágar (BDA), devidamente esterilizados e resfriados a 40ºC.…”

Section: Introductionunclassified

Compatibilidade de Dicyma pulvinata com defensivos agrícolas e eficiência do biocontrole do mal-das-folhas da seringueira em campo

Melo

Mello

Mattos

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar quatro isolados do fungo antagonista Dicyma pulvinata quanto à compatibilidade com defensivos agrícolas e adjuvantes, e a eficiência desses isolados no controle do mal-das-folhas (Microcyclus ulei) da seringueira (Hevea sp.) em campo. A compatibilidade dos isolados com defensivos e adjuvantes foi avaliada com base no crescimento micelial e na esporulação do fungo, em testes conduzidos in vitro. Para avaliação da eficiência do antagonista contra M. ulei, em campo, os quatros isolados do antagonista foram comparados ao controle exercido pelo tratamento com os fungicidas propiconazol + mancozeb. Compatibility of Dicyma pulvinata with pesticides and biocontrol efficiency of South American leaf blight of rubber tree under field conditionsAbstract -The objective of this work was to evaluate four isolates of the antagonist fungus Dicyma pulvinata in terms of its compatibility with chemical pesticides and adjuvants products, and the efficiency of these isolates as biocontrol agent against South American leaf blight (Microcyclus ulei) of rubber tree (Hevea sp.) under field conditions. Isolates compatibility with chemical pesticides and adjuvants was evaluated on mycelial growth and fungus sporulation in vitro. To assess the efficiency of the antagonist against M. ulei under field conditions, the four isolates were compared to the control by the fungicide mixture propiconazol + mancozeb. The assays showed incompatibility of the antagonistic fungus with the fungicides benomyl, carbendazim, mancozeb, propiconazol, besides the insecticide-acaricide endosulfan. Two of the adjuvants tested did not affect the fungus development. It was demonstrated the action of D. pulvinata against M. ulei, in the field, especially for the isolates CEN 62 and CEN 93, which showed control levels similar to the fungicide standard treatment.

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Improving the efficacy of biocontrol agents against soilborne pathogens

Cited by 239 publications

References 103 publications

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Bacterial antagonists and hexanal-induced systemic resistance of mango fruits against Lasiodiplodia theobromae causing stem-end rot

Compatibilidade de Dicyma pulvinata com defensivos agrícolas e eficiência do biocontrole do mal-das-folhas da seringueira em campo

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