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Beauveria bassiana

Jiyoung Kim, Gi-Ho Sung
Beauvericin is a mycotoxin which has insecticidal, anti-microbial, anti-viral and anti-cancer activities. Beauvericin biosynthesis is rapidly catalyzed by the beauvericin synthetase (BEAS) in Beauveria bassiana. Ca2+ plays crucial roles in multiple signaling pathways in eukaryotic cells. These Ca2+ signals are partially decoded by Ca2+ sensor calmodulin (CaM). In this report, we describe that B. bassiana BEAS (BbBEAS) can interact with CaM in a Ca2+ -dependent manner. A synthetic BbBEAS peptide, corresponding to the putative CaM-binding motif, formed a stable complex with CaM in the presence of Ca2+ ...
March 19, 2018: Journal of General and Applied Microbiology
Qing Cai, Sen-Miao Tong, Wei Shao, Sheng-Hua Ying, Ming-Guang Feng
Histone acetyltransferases (HATs) and deacetylases (HDACs) maintain dynamics of lysine acetylation/deacetylation on histones and non-histone substrates involved in gene regulation and cellular events. Hos2 is a class I HDAC that deacetylates unique histone H4-K16 site in yeasts. Here, we report that orthologous Hos2 deacetylates H4-K16 and is also involved in the acetylation of histone H3-K56 and the phosphorylation of histone H2A-S129 and cyclin-dependent kinase 1 CDK1-Y15 in Beauveria bassiana, a filamentous fungal insect pathogen...
March 15, 2018: Cellular Microbiology
Francisco Infante
Coffee (Coffea arabica and C. canephora) is one of the most widely traded agricultural commodities and the main cash crop in ca. 80 tropical countries. Among the factors that limit coffee production, the coffee berry borer, Hypothenemus hampei (Ferrari) has been considered the main insect pest, causing losses of over US$500 million dollars annually. Control of this pest has been hindered by two main factors: the cryptic nature of the insect (i.e., protected inside the coffee berry), and the availability of coffee berries in the field allowing the survival of the pest from one generation to the next...
March 12, 2018: Journal of Agricultural and Food Chemistry
Andrew Galimberti, Andrei Alyokhin
Mineral oil is a product used to reduce Potato Virus Y transmission in potato fields. However, there is little information available about other effects that oil may have on insect pests of potato. To better understand how mineral oil affects potato pests, we performed a series of experiments testing the effects of oil on mortality, behavior, and development of potato aphids, Macrosiphum euphorbiae (Thomas) (Hemiptera: Aphididae), green peach aphids, Myzus persicae (Sulzer) (Hemiptera: Aphididae), and Colorado potato beetles, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae)...
March 8, 2018: Journal of Economic Entomology
Soumya Moonjely, Nemat O Keyhani, Michael J Bidochka
The hyd1/hyd2 hydrophobins are important constituents of the conidial cell wall of the insect pathogenic fungus Beauveria bassiana. This fungus can also form intimate associations with several plant species. Here, we show that inactivation of two Class I hydrophobin genes, hyd1 or hyd2, significantly decreases the interaction of B. bassiana with bean roots. Curiously, the ∆hyd1/∆hyd2 double mutant was less impaired in root association than Δhyd1 or Δhyd2. Loss of hyd genes affected growth rate, conidiation ability and oosporein production...
March 8, 2018: Microbiology
Maribel Rivero-Borja, Ariel W Guzmán-Franco, Esteban Rodríguez-Leyva, Candelario Santillán-Ortega, Alejandro Pérez-Panduro
BACKGROUND: The high natural resistance of the fall armyworm (FAW) to entomopathogenic fungi and the speed it which it develops resistance to chemical insecticides make it difficult to control in several crops where it is a key pest. The study aimed to improve mortality by combining LC50 of chlorpyrifos ethyl and spinosad with two entomopathogenic fungi. RESULTS: Three main results were obtained. i) Both insecticides improved fungus performance when applied simultaneously and when insecticides preceded fungi...
March 7, 2018: Pest Management Science
Perumal Vivekanandhan, Thangaraj Kavitha, Sengodan Karthi, Sengottayan Senthil-Nathan, Muthugoundar Subramanian Shivakumar
Microbial-based pest control is an attractive alternative to chemical insecticides. The present study sought to evaluate the toxicity of the entomopathogenic fungus Beauveria bassiana -28 ethyl acetate extracts on different larval stages and pupae of Culex quinquefasciatus mosquitoes. B. bassiana -28 ethyl acetate mycelial extracts produced mosquitocidal activity against larvae and pupae which was comparable to that of the commercial insecticide B. bassiana -22 extract. The LC50 (lethal concentration that kills 50% of the exposed larvae) values of B...
March 3, 2018: International Journal of Environmental Research and Public Health
E A Chertkova, E V Grizanova, I M Dubovskiy
Dopamine (DA) is known as a hormone neurotrasnmitter molecule involved in several stress reactions in both vertebrates and invertebrates. Following infections with the fungi Metarhizium robertsii or Beauveria bassiana and the bacterium Bacillus thuringiensis, dopamine the concentration was measured at different time points in the haemolymph of the Colorado potato beetle, Leptinotarsa decemlineata and the larvae of the greater wax moth Galleria mellonella. The infection with M. robertsii increased (4 to 12-fold) DA concentrations in the haemolymph of the potato beetle larvae and the oral infection by B...
February 28, 2018: Journal of Invertebrate Pathology
M Constanza Mannino, M Patricia Juárez, Nicolás Pedrini
The chemical control of Triatoma infestans, the major Chagas disease vector in southern South America, has been threatened in the last years by the emergence of pyrethroid-resistant bug populations. As an alternative approach, the efficacy of the entomopathogenic fungus Beauveria bassiana to control T. infestans populations (regardless their pyrethroid susceptibility) has been demonstrated. Growing research efforts on the interaction between T. infestans and B. bassiana by molecular, ecological, biochemical and behavioral traits has allowed framing such interaction as an evolutionary arms race...
February 26, 2018: Infection, Genetics and Evolution
Tilottama Biswas, Gerrit Joop, Charlotte Rafaluk-Mohr
Host-parasite coevolution can influence interactions of the host and parasite with the wider ecological community. One way that this may manifest is in cross-resistance towards other parasites, which has been observed to occur in some host-parasite evolution experiments. In this paper, we test for cross-resistance towards Bacillus thuringiensis and Pseudomonas entomophila in the red flour beetle Tribolium castaneum , which was previously allowed to coevolve with the generalist entomopathogenic fungus Beauveria bassiana ...
February 26, 2018: Insects
Javad Karimi, Surendra K Dara, Steven Arthurs
Biological control programs with arthropods have been in practice in Iran since the 1930s. However, development and registration of microbial biopesticides is much more recent. Currently, about 15 biopesticide products are registered or pending registration for commercial use on various crops. Products based on Bacillus thuringiensis subsp. kurstaki are most widely sold for lepidopteran pest control, followed by B. thuringiensis subsp. isralensis against dipteran pests in vector control programs. Additionally, mycoinsecticides based on Lecanicillium lecanii and Beauveria bassiana, against various arthropod pests, and a mycofungicide based on Trichoderma harzianum for controlling soilborne diseases are also registered...
February 21, 2018: Journal of Invertebrate Pathology
Jun Li, Lu Jiang, Yanwu Zhang, Qiang Guo, Shichou Han
Solenopsis invicta (Buren; Hymenoptera: Formicidae) is a species that has invaded China in recent years. Currently, S. invicta is mainly controlled by chemical treatment, though long-term use of chemical pesticides can cause serious environmental pollution. In this study, a microbial insecticide formulated for the control of S. invicta was screened for laboratory toxicity and field efficacy. The co-toxicity coefficients (CTCs) of the combination of Beauveria bassiana and thiacloprid at various mass ratios were 356...
February 21, 2018: Journal of Economic Entomology
Jiraporn Jirakkakul, Sittiruk Roytrakul, Chettida Srisuksam, Pratchya Swangmaneecharern, Suthathip Kittisenachai, Janthima Jaresitthikunchai, Juntira Punya, Peerada Prommeenate, Jittisak Senachak, Laihong So, Anuwat Tachaleat, Morakot Tanticharoen, Supapon Cheevadhanarak, Songsak Wattanachaisaereekul, Alongkorn Amnuaykanjanasin
The quality of Beauveria bassiana conidia directly affects the virulence against insects. In this study, continuous subculturing of B. bassiana on both rice grains and potato dextrose agar (PDA) resulted in 55 and 49 % conidial yield reduction after 12 passages and 68 and 60 % virulence reduction after 20 and 12 passages at four d post-inoculation, respectively. The passage through Tenebrio molitor and Spodoptera exigua restored the virulence of rice and PDA subcultures, respectively. To explore the molecular mechanisms underlying the conidial quality and the decline of virulence after multiple subculturing, we investigated the conidial proteomic changes...
February 2018: Fungal Biology
Agustin Fernández-Salas, Miguel Angel Alonso Díaz, Rogelio Alejandro Alonso Morales, Roberto Lezama-Gutierrez, José Antonio Cervantes-Chávez
The objectives of the present study were to isolate Beauveria bassiana strains from cattle farms soils, to analyze the phylogenetic relationships among the isolated fungi strains, and to determine the acaricidal effect of B. bassiana isolates on Rhipicephalus microplus engorged ticks, resistant or susceptible to chemical acaricides. Six strains of Beauveria bassiana were obtained and isolated from cattle farms soils by Galleria bait method in Mexican tropics and the acaricidal effect was assessed against 2 populations of R...
February 19, 2018: Journal of Parasitology
Yang Cheng, Zhe Lin, Ju-Mei Wang, Long-Sheng Xing, Guang-Hua Xiong, Zhen Zou
C-type lectin (CTL) is usually considered as pattern recognition receptors in insect innate immunity. Here we found that CTL14 of Helicoverpa armigera was only activated in the fifth instar larvae not in the second instar by entomopathogen Beauveria bassiana infection. Recombinant CTL14 protein was found to form aggregates with zymosan and B. bassiana in vitro. Immunoprecipitation studies demonstrated that CTL14 interacted with serine proteinases (SP), serine proteinase inhibitor (serpin), prophenoloxidases (PPO) and vitellogenin (Vg) in the larval hemolymph...
February 14, 2018: Developmental and Comparative Immunology
Shengyong Wu, Zhenlong Xing, Weinan Sun, Xuenong Xu, Ruixia Meng, Zhongren Lei
Determination of intraguild interactions between entomopathogens and predators is important when attempting to use a combination of these two natural enemy groups for biological control of their shared arthropod pest species. This study assessed the effects of Beauveria bassiana on the predation and associated behavior of the predatory mite, Phytoseiulus persimilis, against Tetranychus urticae. The functional response tests showed that P. persimilis exhibited a Holling type II response on the spider mite, Tetranychus urticae, when treated with either a B...
February 14, 2018: Journal of Invertebrate Pathology
Se Jin Lee, Mi Rong Lee, Sihyeon Kim, Jong Cheol Kim, So Eun Park, Tae Young Shin, Jae Su Kim
Beauveria bassiana is an entomopathogenic fungi used in environmentally mindful pest management. Its main active ingredient, conidia, is commercially available as a fungal biopesticide. Many studies of conidia production have focused on how to optimize culture conditions for maximum productivity and stability against unfavorable abiotic factors. However, understanding of how conidiogenesis-related genes provide improved conidial production remains unclear. In this study, we focus on identifying conidiogenesis-related genes in B...
February 14, 2018: Journal of Invertebrate Pathology
Justin L Hatting, Sean D Moore, Antoinette P Malan
Invertebrate pests pose a significant threat to food security on the African continent. In response, South Africa has become one of the largest importers of chemical pesticides in sub-Saharan Africa, with several hundred active ingredients registered. To address the over-reliance on such chemicals, the South African Department of Agriculture, Forestry and Fisheries (DAFF) has eliminated or restricted several pesticides since the late 1970s. The recent launch of the South African National Bio-Economy Strategy and establishment of the South African Bioproducts Organisation (SABO), together with new guidelines for registration of biopesticides in 2015, also support this endeavour...
February 7, 2018: Journal of Invertebrate Pathology
Ó Dembilio, Pilar Moya, Sandra Vacas, Lola Ortega-García, Enrique Quesada-Moraga, Josep A Jaques, Vicente Navarro-Llopis
BACKGROUND: A new Beauveria bassiana-based Attract and Infect Device (AID) to control Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae) was developed. The virulence and persistence of the fungal formulation used in the AID was evaluated in laboratory. Semi-field and field trials were carried out to validate results and establish the potential of this device as a control tool. RESULTS: In laboratory conditions, an LT50 of 4.33 days was obtained when adults (7-10 day-old) were exposed to the Inoculation Tunnel (IT) containing 1 × 1010 conidia/g in an oil-based fungal formulation...
February 9, 2018: Pest Management Science
Qing Cai, Juan-Juan Wang, Bo Fu, Sheng-Hua Ying, Ming-Guang Feng
Gcn5 is a core histone acetyltransferase that catalyzes histone H3 acetylation on N-terminal lysine residues in yeasts and was reported to catalyze H3K9/K14 acetylation required for activating asexual development in Aspergillus. Here, we report a localization of Gcn5 ortholog in the nucleus and cytoplasm of Beauveria bassiana, a fungal insect pathogen. Deletion of gcn5 led to hypoacetylated H3 at K9/14/18/27 and 97% reduction in conidiation capacity as well as severe defects in colony growth and conidial thermotolerance...
February 7, 2018: Environmental Microbiology
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