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Biocontrol

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https://www.readbyqxmd.com/read/28231031/different-serological-profiles-to-cooccurring-pathogenic-and-nonpathogenic-caliciviruses-in-wild-european-rabbits-oryctolagus-cuniculus-across-australia
#1
Tanya E Cox, June Liu, Remy van de Ven, Tanja Strive
Rabbit hemorrhagic disease virus (RHDV) was released in Australia as a biocontrol agent for wild European rabbits ( Oryctolagus cuniculus ) in 1995-96; however, its effects were variable across Australia with the greatest population reductions seen in lower annual rainfall areas (<400 mm). There is speculation that the reduced effectiveness observed at higher annual rainfall sites is at least partially due to the presence of a nonpathogenic calicivirus (RCV-A1). The RCV-A1 is related to RHDV and confers partial and transient protection against lethal RHDV infection in laboratory tests...
February 23, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28221826/the-behavioral-type-of-a-top-predator-drives-the-short-term-dynamic-of-intraguild-predation
#2
Radek Michalko, Stano Pekár
Variation in behavior among individual top predators (i.e., the behavioral type) can strongly shape pest suppression in intraguild predation (IGP). However, the effect of a top predator's behavioral type-namely, foraging aggressiveness (number of killed divided by prey time) and prey choosiness (preference degree for certain prey type)-on the dynamic of IGP may interact with the relative abundances of top predator, mesopredator, and pest. We investigated the influence of the top predator's behavioral type on the dynamic of IGP in a three-species system with a top predator spider, a mesopredator spider, and a psyllid pest using a simulation model...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28219527/induced-systemic-resistance-and-symbiotic-performance-of-peanut-plants-challenged-with-fungal-pathogens-and-co-inoculated-with-the-biocontrol-agent-bacillus-sp-chep5-and-bradyrhizobium-sp-semia6144
#3
María Soledad Figueredo, María Laura Tonelli, Fernando Ibáñez, Federico Morla, Guillermo Cerioni, María Del Carmen Tordable, Adriana Fabra
Synergism between beneficial rhizobacteria and fungal pathogens is poorly understood. Therefore, evaluation of co-inoculation of bacteria that promote plant growth by different mechanisms in pathogen challenged plants would contribute to increase the knowledge about how plants manage interactions with different microorganisms. The goals of this work were a) to elucidate, in greenhouse experiments, the effect of co-inoculation of peanut with Bradyrhizobium sp. SEMIA6144 and the biocontrol agent Bacillus sp. CHEP5 on growth and symbiotic performance of Sclerotium rolfsii challenged plants, and b) to evaluate field performance of these bacteria in co-inoculated peanut plants...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219523/combinatorial-effect-of-mutagenesis-and-medium-component-optimization-on-bacillus-amyloliquefaciens-antifungal-activity-and-efficacy-in-eradicating-botrytis-cinerea
#4
Fatma Masmoudi, Saoussen Ben Khedher, Amel Kamoun, Nabil Zouari, Slim Tounsi, Mohamed Trigui
This work is directed towards Bacillus amyloliquefaciens strain BLB371 metabolite production for biocontrol of fungal phytopathogens. In order to maximise antifungal metabolite production by this strain, two approaches were combined: random mutagenesis and medium component optimization. After three rounds of mutagenesis, a hyper active mutant, named M3-7, was obtained. It produces 7 fold more antifungal metabolites (1800AU/mL) than the wild strain in MC medium. A hybrid design was applied to optimise a new medium to enhance antifungal metabolite production by M3-7...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28217886/the-use-of-newly-isolated-streptomyces-strain-tn258-as-potential-biocontrol-agent-of-potato-tubers-leak-caused-by-pythium-ultimum
#5
Imen Sellem, Mohamed Ali Triki, Lobna Elleuch, Manel Cheffi, Ahlem Chakchouk, Slim Smaoui, Lotfi Mellouli
An actinomycete strain designated TN258, was isolated from Tunisian Sahara soil and selected for its antagonistic activity, especially against Pythium ultimum (P. ultimum) causing potato tubers leak. Based on the results of cultural characteristic of TN258 strain, the 16S rRNA gene nucleotide sequence (1433 bp, accession n° HE600071) and the phylogenetic analysis, we propose the assignment of our new isolate bacterium as Streptomyces TN258 strain. After culture optimization, the inhibitory effect of TN258 free cell supernatant against P...
February 20, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28217107/modulation-of-human-immune-response-by-fungal-biocontrol-agents
#6
REVIEW
Cibele Konstantinovas, Tiago A de Oliveira Mendes, Marcos A Vannier-Santos, Jane Lima-Santos
Although the vast majority of biological control agents is generally regarded as safe for humans and environment, the increased exposure of agriculture workers, and consumer population to fungal substances may affect the immune system. Those compounds may be associated with both intense stimulation, resulting in IgE-mediated allergy and immune downmodulation induced by molecules such as cyclosporin A and mycotoxins. This review discusses the potential effects of biocontrol fungal components on human immune responses, possibly associated to infectious, inflammatory diseases, and defective defenses...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28213318/efficacy-of-fungal-and-bacterial-antagonists-for-controlling-growth-fum1-gene-expression-and-fumonisin-b1-production-by-fusarium-verticillioides-on-maize-cobs-of-different-ripening-stages
#7
Nik Iskandar Putra Samsudin, Alicia Rodriguez, Angel Medina, Naresh Magan
This study was carried out to examine the efficacy of two biocontrol agents (Clonostachys rosea 016, BCA1; Gram-negative bacterium, BCA5) for control of FUM1 gene expression and fumonisin B1 (FB1) production by F. verticillioides FV1 on maize cobs of different ripening stages: R3, Milk (0.985 aw); R4, Dough (0.976 aw); R5, Dent (0.958 aw). Initially, temporal studies on FUM1 gene expression and FB1 production were performed on maize kernels for up to 14days. This revealed that day 10 was optimum for both parameters, and was used in the biocontrol studies...
February 9, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28211500/video-monitoring-of-brown-planthopper-predation-in-rice-shows-flaws-of-sentinel-methods
#8
Yi Zou, Joop de Kraker, Felix J J A Bianchi, Mario D van Telgen, Haijun Xiao, Wopke van der Werf
Immobilized preys are routinely used in agro-ecological exposure studies to quantify predation of pests under field conditions, but this method has not been validated. Our purpose was to determine the validity of using immobilized adults of the major rice pest Nilaparvata lugens, brown plant hopper (BPH), as sentinels. We used direct observation by video recording to determine the causal agents of removal of field exposed BPH sentinels with two experiments: 1) we recorded removal events of dead, immobilized BPH; and 2) we compared removal of (i) dead, immobilized BPH, (ii) live, immobilized BPH, and (iii) live, mobile BPH...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210254/influence-of-oxidative-stress-on-biocontrol-activity-of-cryptococcus-laurentii-against-blue-mold-on-peach-fruit
#9
Zhanquan Zhang, Jian Chen, Boqiang Li, Chang He, Yong Chen, Shiping Tian
The limitations of chemical fungicides for the control of postharvest diseases have recently become more apparent. The utilization of antagonistic microorganisms is a promising alternative to that of fungicides to control postharvest decay. In previous studies, the antagonistic yeast Cryptococcus laurentii has shown excellent effects of biocontrol and great potential for practical application. Adverse conditions, such as oxidative stress, limit the practical application of antagonistic yeast. In this study, we investigated the oxidative stress tolerance of C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28208615/patulin-degradation-by-the-biocontrol-yeast-sporobolomyces-sp-is-an-inducible-process
#10
Giuseppe Ianiri, Cristina Pinedo, Alessandra Fratianni, Gianfranco Panfili, Raffaello Castoria
Patulin is a mycotoxin produced by Penicillium expansum and a common contaminant of pome fruits and their derived products worldwide. It is considered to be mutagenic, genotoxic, immunotoxic, teratogenic and cytotoxic, and the development of strategies to reduce this contamination is an active field of research. We previously reported that Sporobolomyces sp. is able to degrade patulin and convert it into the breakdown products desoxypatulinic acid and ascladiol, both of which were found to be less toxic than patulin...
February 10, 2017: Toxins
https://www.readbyqxmd.com/read/28205337/should-the-biofilm-mode-of-life-be-taken-into-consideration-for-microbial-biocontrol-agents
#11
REVIEW
Caroline Pandin, Dominique Le Coq, Alexis Canette, Stéphane Aymerich, Romain Briandet
Almost one-third of crop yields are lost every year due to microbial alterations and diseases. The main control strategy to limit these losses is the use of an array of chemicals active against spoilage and unwanted pathogenic microorganisms. Their massive use has led to extensive environmental pollution, human poisoning and a variety of diseases. An emerging alternative to this chemical approach is the use of microbial biocontrol agents. Biopesticides have been used with success in several fields, but a better understanding of their mode of action is necessary to better control their activity and increase their use...
February 16, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28194866/pseudomonas-protegens-cs1-from-the-lemon-phyllosphere-as-a-candidate-for-citrus-canker-biocontrol-agent
#12
G Michavila, C Adler, P R De Gregorio, M J Lami, M C Caram Di Santo, A M Zenoff, R E de Cristobal, P A Vincent
Citrus canker is a worldwide-distributed disease caused by Xanthomonas citri subsp. citri. One of the most used strategies to control the disease is centered on copper-based compounds that cause environmental problems. Therefore, it is of interest to develop new strategies to manage the disease. Previously, we reported the ability of the siderophore pyochelin, produced by the opportunistic human pathogen Pseudomonas aeruginosa, to inhibit in vitro several bacterial species including X. citri subsp. citri. The action mechanism, addressed with the model bacterium Escherichia coli, was connected to the generation of reactive oxygen species...
February 14, 2017: Plant Biology
https://www.readbyqxmd.com/read/28194740/potential-of-burkholderia-seminalis-tc3-4-2r3-as-biocontrol-agent-against-fusarium-oxysporum-evaluated-by-mass-spectrometry-imaging
#13
Francisca Diana da Silva Araújo, Welington Luiz Araújo, Marcos Nogueira Eberlin
Species of genus Burkholderia display different interaction profiles in the environment, causing either several diseases in plants and animals or being beneficial to some plants, promoting their growth, and suppressing phytopathogens. Burkholderia spp. also produce many types of biomolecules with antimicrobial activity, which may be commercially used to protect crops of economic interest, mainly against fungal diseases. Herein we have applied matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) to investigate secondary metabolites produced by B...
February 13, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28188766/leptolegnia-chapmanii-straminipila-peronosporomycetes-as-a-future-biorational-tool-for-the-control-of-aedes-aegypti-l
#14
REVIEW
A C Gutierrez, M E Rueda Páramo, M L Falvo, C C López Lastra, J J García
The aim of the present review is to summarize the current knowledge about Leptolegnia chapmanii as a pathogen of mosquito larvae. To this end, we present data on its identification, distribution, host range and effects on non-target organisms, effects of environmental factors, in vitro growth, release and persistence in anthropic environments, and effect combined with other insecticides. The data presented allow confirming its potential as a biocontrol agent.
February 8, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28188093/efficacy-of-epiphytic-bacteria-to-prevent-northern-leaf-blight-caused-by-exserohilum-turcicum-in-maize
#15
Melina Sartori, Andrea Nesci, Julián García, María A Passone, Analía Montemarani, Miriam Etcheverry
Eight potential biological control agents (BCAs) were evaluated in planta in order to assess their effectiveness in reducing disease severity of northern leaf blight caused by Exserohilum turcicum. The assay was carried out in greenhouse. Twenty-six-day-old plants, V4 phenological stage, were inoculated with antagonists by foliar spray. Only one biocontrol agent was used per treatment. Ten days after this procedure, all treatments were inoculated with E. turcicum by foliar application. Treatments performed were: C-Et: control of E...
February 7, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28186324/isolation-and-identification-of-n-butyl-tetrahydro-5-oxofuran-2-carboxamide-produced-by-bacillus-sp-l60-and-its-antifungal-activity
#16
Yong-Seong Lee, Jeong-Yong Cho, Jae-Hak Moon, Kil-Yong Kim
Rhizoctonia solani is the cause of substantial economic loss in many crops. The aim of this study is to investigate biocontrol potential of Bacillus sp. L60 against R. solani and to purify an antifungal compound. In this study, Bacillus sp. L60 demonstrated significant antagonism toward R. solani with the dual culture assay. The antifungal compound was extracted from Bacillus sp. L60 culture supernatant with n-butanol, and identified as N-butyl-tetrahydro-5-oxofuran-2-carboxamide (BT-5O-2C) having molecular weights of 185...
February 10, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28182760/double-strand-rna-delivery-system-for-plant-sap-feeding-insects
#17
Saikat Kumar B Ghosh, Wayne B Hunter, Alexis L Park, Dawn E Gundersen-Rindal
Double-stranded RNA (dsRNA)-mediated gene silencing, also known as RNA interference (RNAi), has been a breakthrough technology for functional genomic studies and represents a potential tool for the management of insect pests. Since the inception of RNAi numerous studies documented successful introduction of exogenously synthesized dsRNA or siRNA into an organism triggering highly efficient gene silencing through the degradation of endogenous RNA homologous to the presented siRNA. Managing hemipteran insect pests, especially Halyomorpha halys (Stål) (Heteroptera: Pentatomidae), the brown marmorated stink bug (BMSB), is critical to food productivity...
2017: PloS One
https://www.readbyqxmd.com/read/28177793/biocontrol-of-i-burkholderia-cepacia-i-complex-bacteria-and-bacterial-phytopathogens-by-i-bdellovibrio-bacteriovorus-i
#18
Damian McNeely, Ryan M Chanyi, James S Dooley, John E Moore, Susan F Koval
<i>Bdellovibrio</i> and like organisms are predatory bacteria that have the unusual property of using the cytoplasmic constituents of other Gram-negative bacteria as nutrients. These predators may thus provide an alternative approach to the biocontrol of human and plant pathogens. Predators were isolated in enrichment cultures with soil and sewage on <i>Burkholderia cenocepacia</i> strains K56-2 and J2315 as prey cells. Three isolates (DM7C, DM8A and DM11A) were identified as <i>Bdellovibrio bacteriovorus</i> based on morphology, a periplasmic life cycle and 16S rRNA gene sequencing...
December 22, 2016: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28168032/no-inbreeding-depression-in-laboratory-reared-individuals-of-the-parasitoid-wasp-allotropa-burrelli
#19
Bastien Quaglietti, Lucie Tamisier, Géraldine Groussier, Alexandre Fleisch, Isabelle Le Goff, Nicolas Ris, Philippe Kreiter, Xavier Fauvergue, Thibaut Malausa
Inbreeding depression is a major concern in almost all human activities relating to plant and animal breeding. The biological control of pests with natural enemies is no exception, because populations of biocontrol agents experience a series of bottlenecks during importation, rearing, and introduction. A classical biological control program for the Comstock mealybug Pseudococcus comstocki (Hemiptera: Pseudococcidae) was initiated in France in 2008, based on the introduction of an exotic parasitoid, Allotropa burrelli Mues...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28164794/genomic-and-metabolic-traits-endow-bacillus-velezensis-cc09-with-a-potential-biocontrol-agent-in-control-of-wheat-powdery-mildew-disease
#20
Xun-Chao Cai, Chang-Hong Liu, Bao-Tong Wang, Ya-Rong Xue
Bacillus velezensis CC09, which was isolated from healthy leaves of Cinnamomum camphora and previously identified as Bacillus amyloliquefaciens CC09, shows great potential as a new biocontrol agent, in control of many phytopathogenic diseases. To extend our understanding of the potential antifungal capacities, we did a whole genome analysis of strain CC09. Result shows that strain CC09 has a relatively large genome size (4.17Mb) with an average GC content of 46.1%, and 4021 predicted genes. Thirteen secondary metabolites encoding clusters have been identified within the genome of B...
March 2017: Microbiological Research
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