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Beauveria bassiana

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https://www.readbyqxmd.com/read/28089049/variation-in-virulence-of-beauveria-bassiana-and-b-pseudobassiana-to-the-pine-weevil-pissodes-nemorensis-in-relation-to-mycelium-characteristics-and-virulence-genes
#1
Pedro Romón, Hardus Hatting, Arturo Goldarazena, Juan Carlos Iturrondobeitia
Entomopathogenic fungi such as Beauveria spp. have potential applications in the biocontrol of insect pests but little is known regarding their infectivity to the pine weevil Pissodes nemorensis. In this study, five isolates of Beauveria pseudobassiana and five isolates of Beauveria bassiana were tested for characteristics correlating with virulence on P. nemorensis. Isolate UAMH301 had the lowest mean lethal concentration value whereas the highest value was obtained with isolate LRC137. Growth rate was negatively correlated with virulence in B...
February 2017: Fungal Biology
https://www.readbyqxmd.com/read/28076898/characterization-of-the-hog1-mapk-pathway-in-the-entomopathogenic-fungus-beauveria-bassiana
#2
Jing Liu, Zhi-Kang Wang, Huan-Huan Sun, Sheng-Hua Ying, Ming-Guang Feng
High-osmolarity glycerol (HOG) pathway required for yeast osmoregulation relies upon the mitogen-activated protein kinase (MAPK) Hog1 cascade that comprise the MAPKKKs Ssk2/Ssk22 and Ste11 converging on the MAPKK Pbs2. Here we show a Hog1 cascade with the unique MAPKKK Ssk2 acting in Beauveria bassiana. Hypersensitivity to high osmolarity and high resistance to fludioxonil fungicide appeared in Δssk2, Δpbs2 and Δhog1 mutants whereas the two hallmark phenotypes were reversed in Δste11. Increased sensitivity to heat shock and decreased sensitivity to cell wall perturbation also occurred in the three mutants but not in Δste11 although antioxidant phenotypes were different in all deletion mutants...
January 11, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28066976/delivering-beauveria-bassiana-with-electrostatic-powder-for-the-control-of-stored-product-beetles
#3
Athanassiou G Christos, Rumbos I Christos, Sakka Maria, Storm Clare, Dillon Aoife, Potin Olivier
BACKGROUND: The efficacy of a Beauveria bassiana-based formulation (Bb38) with Entostat, an electrostatically charged powder, was investigated as surface treatment against Cryptolestes ferrugineus, Oryzaephilus surinamensis and Sitophilus granarius adults. In lab bioassays, the efficacy of Bb38 against the aforementioned species was examined on concrete, plywood, steel and ceramic, whereas its residual efficacy against the same species was assessed on concrete and steel in the presence or absence of illumination...
January 9, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28054950/microbial-glycosylation-of-daidzein-genistein-and-biochanin-a-two-new-glucosides-of-biochanin-a
#4
Sandra Sordon, Jarosław Popłoński, Tomasz Tronina, Ewa Huszcza
Biotransformation of daidzein, genistein and biochanin A by three selected filamentous fungi was investigated. As a result of biotransformations, six glycosylation products were obtained. Fungus Beauveria bassiana converted all tested isoflavones to 4″-O-methyl-7-O-glucosyl derivatives, whereas Absidia coerulea and Absidia glauca were able to transform genistein and biochanin A to genistin and sissotrin, respectively. In the culture of Absidia coerulea, in addition to the sissotrin, the product of glucosylation at position 5 was formed...
January 3, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28040530/correlation-of-cell-surface-proteins-of-distinct-beauveria-bassiana-cell-types-and-adaption-to-varied-environment-and-interaction-with-the-host-insect-cell-surface-associated-proteins-of-b-bassiana
#5
Zhi Yang, Hongyan Jiang, Xin Zhao, Zhuoyue Lu, Zhibing Luo, Xuebing Li, Jing Zhao, Yongjun Zhang
The insect fungal pathogen Beauveria bassiana produces a number of distinct cell types that include aerial conidia, blastospores and haemolymph-derived cells, termed hyphal bodies, to adapt varied environment niches and within the host insect. These cells display distinct biochemical properties and surface structures, and a highly ordered outermost brush-like structure uniquely present on hyphal bodies, but not on any in vitro cells. Here, we found that the outermost structure on the hyphal bodies mainly consisted of proteins associated to structural wall components in that most of it could be removed by dithiothreitol (DTT) or proteinase K...
December 28, 2016: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28032511/isolation-and-characterization-of-2-pyridone-alkaloids-and-alloxazines-from-beauveria-bassiana
#6
W J Andrioli, A A Lopes, B C Cavalcanti, C Pessoa, N P D Nanayakkara, J K Bastos
Two novel compounds bearing heterocyclic nitrogen, 2-pyridone alkaloid (1) and alloxazine derivative (2), along with the known pretenellin B (3), pyridovericin (4) and lumichrome (5) were isolated from a culture of the entomopathogenic fungal strain Beauveria bassiana. The chemical structures of 2-pyridone alkaloid and alloxazine derivative were established on the basis of the interpretation of spectroscopic data. The isolated compounds were evaluated in a panel of five cancer cell lines and pyridovericin exhibited cytotoxicity (IC50, μM) against cancer cell lines: HL-60 (25...
December 29, 2016: Natural Product Research
https://www.readbyqxmd.com/read/28011319/effect-of-vacuolar-atpase-subunit-h-vmah-on-cellular-ph-asexual-cycle-stress-tolerance-and-virulence-in-beauveria-bassiana
#7
Jing Zhu, Xiao-Guan Zhu, Sheng-Hua Ying, Ming-Guang Feng
Vacuolar ATPase (V-ATPase) is a conserved multi-subunit protein complex that mediates intracellular acidification in fungi. Here we show functional diversity of V-ATPase subunit H (BbVmaH) in Beauveria bassiana, a filamentous fungal insect pathogen. Deletion of BbvmaH resulted in elevated vacuolar pH, increased Ca(2+) level in cytosol but not in vacuoles, accelerated culture acidification and reduced accumulation of extracellular ammonia. Aerial conidiation and submerged blastospore production were largely delayed and reduced in the deletion mutant, respectively, accompanied with a significant delay in conidial germination, alterations of conidia and blastospores in morphology, size and/or density, and severe growth defects in minimal media with different carbon and nitrogen sources...
December 21, 2016: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/27995045/in-vitro-interaction-of-metarhizium-anisopliae-ma9236-and-beauveria-bassiana-bb9205-with-heterorhabditis-bacteriophora-hni0100-for-the-control-of-plutella-xylostella
#8
J P Correa-Cuadros, A Sáenz-Aponte, M X Rodríguez-Bocanegra
The diamondback moth (Plutella xylostella) is a major pest of broccoli crops in Colombia. To control P. xylostella, we evaluated the interaction of Beauveria bassiana Bb9205 and Metarhizium anisopliae Ma9236 with Heterorhabditis bacteriophora HNI0100 and its bacterial symbiont Photorhabdus luminescens HNI0100. We used antagonism and disk diffusion assays with fungal extracts to test the interaction between symbiotic bacterium and fungi. P. luminescens inhibited the growth of B. bassiana and M. anisopliae up to 40% by the secretion of secondary metabolites, whereas fungal extracts did not inhibit P...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27986935/bioassay-and-scanning-electron-microscopic-observations-reveal-high-virulence-of-entomopathogenic-fungus-beauveria-bassiana-on-the-onion-maggot-diptera-anthomyiidae-adults
#9
Hui Zhang, Shengyong Wu, Zhenlong Xing, Xiaoqing Wang, Zhongren Lei
When flies were dipped in 1 × 10(8) conidia/ml conidia suspensions and then kept in the incubator (22 ± 1 °C, 70 ± 5% RH), scanning electron microscope observations revealed that, at 2 h, the majority of adhering Beauveria bassiana conidia were attached to either the wing surface or the interstitial area between the macrochaetae on the thorax and abdomen of the onion maggot adults. Germ tubes were being produced and had oriented toward the cuticle by 18 h. Penetration of the insect cuticle had occurred by 36 h, and by 48 h, germ tubes had completely penetrated the cuticle...
December 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27933578/inhibitory-activity-of-beauveria-bassiana-and-trichoderma-spp-on-the-insect-pests-xylotrechus-arvicola-coleoptera-cerambycidae-and-acanthoscelides-obtectus-coleoptera-chrisomelidae-bruchinae
#10
Álvaro Rodríguez-González, Sara Mayo, Óscar González-López, Bonifacio Reinoso, Santiago Gutierrez, Pedro Antonio Casquero
Xylotrechus arvicola is an important pest in vineyards (Vitis vinifera) in the main Iberian wine-producing regions, and Acanthoscelides obtectus causes severe post-harvest losses in the common bean (Phaseolus vulgaris). Under laboratory conditions with a spray tower, the susceptibility of the immature stages of X. arvicola and A. obtectus against the entomopathogenic fungi Beauveria bassiana and four strains of Trichoderma spp. was evaluated. Both insect pests T. harzianum and B. bassiana showed a good inhibitory activity, accumulating an inhibition on the eggs of values above 85 and 82%, respectively...
January 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27914926/metschnikowia-cf-typographi-and-other-pathogens-from-the-bark-beetle-ips-sexdentatus-prevalence-histological-and-ultrastructural-evidence-and-molecular-characterization
#11
Regina G Kleespies, Young Woon Lim, Cezary Tkaczuk, Marta Wrzosek, Bernhardt M Steinwender, Rudolf Wegensteiner
Ips sexdentatus (six-spined engraver beetle) from Austria and Poland were dissected and examined for the presence of pathogens. Specimens collected in Austria were found to contain the ascomycetous fungus Metschnikowia cf. typographi. Infection rates ranged from 3.6% to 26.8% at different collection sites. M. cf. typographi infected midguts were investigated by histological, ultrastructural and molecular techniques. Extraordinary ultrastructural details are shown, such as ascospores with bilateral flattened flanks resembling alar rims at both sides of their attenuating tube-like ends...
December 1, 2016: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/27905873/comparative-genomics-of-beauveria-bassiana-uncovering-signatures-of-virulence-against-mosquitoes
#12
Claudio A Valero-Jiménez, Luigi Faino, Daphne Spring In't Veld, Sandra Smit, Bas J Zwaan, Jan A L van Kan
BACKGROUND: Entomopathogenic fungi such as Beauveria bassiana are promising biological agents for control of malaria mosquitoes. Indeed, infection with B. bassiana reduces the lifespan of mosquitoes in the laboratory and in the field. Natural isolates of B. bassiana show up to 10-fold differences in virulence between the most and the least virulent isolate. In this study, we sequenced the genomes of five isolates representing the extremes of low/high virulence and three RNA libraries, and applied a genome comparison approach to uncover genetic mechanisms underpinning virulence...
December 1, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27889557/identification-of-a-hemolin-protein-from-actias-selene-mediates-immune-response-to-pathogens
#13
Cen Qian, Fang Wang, Baojian Zhu, Lei Wang, Guoqing Wei, Yu Sun, Sheng Li, Chaoliang Liu
Hemolins play an important role in development and innate immunity in insects. In this study, a hemolin cDNA of 1412bp in Actias selene (As-HEM) was isolated and its open reading frames (ORFs) were 420 amino acid residues. Sequence analysis indicated As-HEM was homologous to those hemolins from other insects species. The recombinant protein of As-HEM was expressed in Escherichia coli, and anti-As-HEM antibodies were prepared. Real-time quantitative PCR (RT-qPCR) and western blot results revealed that mRNA and protein levels of As-HEM were mostly detected in hemocytes and hemolymph...
January 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/27867018/chitin-synthase-1-gene-is-crucial-to-antifungal-host-defense-of-the-model-beetle-tribolium-castaneum
#14
Yuuki Hayakawa, Daiki Kato, Katsumi Kamiya, Chieka Minakuchi, Ken Miura
The importance of the insect cuticle as a primary protective barrier against entomopathogens has long been noted. In the present study, we addressed this issue by utilizing an experimental infection system composed of the model beetle T. castaneum and two entomopathogenic fungal species, Beauveria bassiana and Metarhizium anisopliae. The pupae were relatively susceptible to these fungi by the natural route of infection, with some refractoriness developed with age, while the adults exhibited much higher refractoriness...
November 17, 2016: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/27855217/screening-of-fungi-for-biological-control-of-a-triatomine-vector-of-chagas-disease-temperature-and-trypanosome-infection-as-factors
#15
Aline R M Garcia, Adriana de Paula Rocha, Camila C Moreira, Silma L Rocha, Alessandra A Guarneri, Simon L Elliot
Entomopathogenic fungi have been investigated as an alternative tool for controlling various insects, including triatomine vectors of the protozoan Trypanosoma cruzi, the etiological agent of Chagas disease. Here we tested the pathogenicity and virulence of ten isolates of the fungi Metarhizium spp. and Beauveria bassiana against Rhodnius prolixus and found all of the isolates to be virulent. We used two isolates (URPE-11 Metarhizium anisopliae and ENT-1 Beauveria bassiana) for further screening based on their prolific sporulation in vitro (an important property of fungal biopesticides)...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27836665/expression-profiling-of-bombyx-mori-gloverin2-gene-and-its-synergistic-antifungal-effect-with-cecropin-a-against-beauveria-bassiana
#16
Dingding Lü, Tao Geng, Chengxiang Hou, Guangxing Qin, Kun Gao, Xijie Guo
Gloverin2 is a cationic and glycine-rich antimicrobial peptide whose expression can be induced in fat body of silkworm (Bombyx mori) larvae exposed to bacteria. The purpose of this study is to identify the roles of Bombyx mori gloverin2 (Bmgloverin2) during entomopathogenic fungus Beauveria bassiana infection. Fluorescent quantitative real-time PCR analysis indicated that the relative expression level of Bmgloverin2 gene was up-regulated in the silkworm larvae infected by B. bassiana. The cDNA of Bmgloverin2 was cloned from the silkworm by RT-PCR and the DNA segment of the Bmgloverin2 peptide (without signal peptide sequence) was inserted into pCzn1 expression plasmid and expressed in E...
February 5, 2017: Gene
https://www.readbyqxmd.com/read/27830375/erratum-to-highly-virulent-beauveria-bassiana-strains-against-the-two-spotted-spider-mite-tetranychus-urticae-show-no-pathogenicity-against-five-phytoseiid-mite-species
#17
Shengyong Wu, Haicui Xie, Maoye Li, Xuenong Xu, Zhongren Lei
No abstract text is available yet for this article.
December 2016: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/27809973/essential-oils-and-beauveria-bassiana-against-dermanyssus-gallinae-acari-dermanyssidae-towards-new-natural-acaricides
#18
Davide Immediato, Luciana Aguiar Figueredo, Roberta Iatta, Antonio Camarda, Rafaela Lira Nogueira de Luna, Annunziata Giangaspero, Sinval Pinto Brandão-Filho, Domenico Otranto, Claudia Cafarchia
Essential oils (EOs) and entomopathogenic fungi such as Beauveria bassiana (Bb) strains have the potential to be used as alternative insecticides and acaricides for controlling ectoparasites as Dermanyssus gallinae. These compounds have some limitations in their use: the acaricidal effect of EOs is rapid, but short-lived, whilst that of Bb is delayed, but long-lived. To evaluate the effect of both compounds combined against D. gallinae, the non-toxic dose of Eucalyptus globulus, Eucalyptus citriodora, Thymus vulgaris and Eugenia caryophyllata essential oils were firstly calculated for "native" strains of Bb...
October 15, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27799921/high-ozone-o3-affects-the-fitness-associated-with-the-microbial-composition-and-abundance-of-q-biotype-bemisia-tabaci
#19
Yanyun Hong, Tuyong Yi, Xiaoling Tan, Zihua Zhao, Feng Ge
Ozone (O3) affects the fitness of an insect, such as its development, reproduction and protection against fungal pathogens, but the mechanism by which it does so remains unclear. Here, we compared the fitness (i.e., the growth and development time, reproduction and protection against Beauveria bassiana (B. bassiana) of Q biotype whiteflies fumigated under hO3 (280 ± 20 ppb) and control O3 (50 ± 10 ppb) concentrations. Moreover, we determined that gene expression was related to development, reproduction and immunity to B...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27789295/effect-of-stress-on-heat-shock-protein-levels-immune-response-and-survival-to-fungal-infection-of-mamestra-brassicae-larvae
#20
E H Richards, M P Dani, Y Lu, T Butt, R J Weaver
Although the utilisation of fungal biological control agents to kill insect pests is desirable, it is known that the outcome of infection may be influenced by a number of criteria, including whether or not the target insect is stressed. In the current work, topical treatment of larvae of the lepidopteran pest, Mamestra brassicae, with conidia of Beauveria bassiana, followed by a heat stress (HS; 37°C for 1h) 48h later, resulted in a similar level of larval survival to that occurring for no heat stress (No-HS), fungus-treated larvae...
January 2017: Journal of Insect Physiology
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