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Beauveria bassiana

Chettida Srisuksam, Juntira Punya, Songsak Wattanachaisaereekul, Wachiraporn Toopaang, Supapon Cheevadhanarak, Morakot Tanticharoen, Alongkorn Amnuaykanjanasin
pks14, a reducing clade IIb polyketide synthase gene, is preserved throughout the evolution of entomopathogenic fungi. We examined the functions of pks14 in Beauveria bassiana using targeted gene disruption. pks14 disruption was verified by Southern blot and PCR analyses. The radial growth, cell dry weight and conidial germination of Δpks14 were comparable to that of the wild type. Our sequence and gene expression analyses of the pks14 biosynthetic cluster demonstrated: (i) cotranscription and constitutive expression of nearly all genes of the aforementioned cluster including C2H2 zinc finger transcription regulator gene, but not pks14 and cytochrome P450 gene; (ii) expression of pks14 gene in insect-containing culture condition only; whereby (iii) a KAR9-like gene in direct proximity with pks14 is the only gene showing co-regulation...
May 22, 2018: FEMS Microbiology Letters
Allan Mweke, Christian Ulrichs, Paulin Nana, Komivi Senyo Akutse, Komi Kouma Mokpokpo Fiaboe, Nguya Kalemba Maniania, Sunday Ekesi
Cowpea, Vigna unguiculata ((L.) Walp; Fabales: Fabaceae), is an important indigenous vegetable and grain legume in the tropics where it represents a major diet component. Cowpea aphid, Aphis craccivora (Koch; Hemiptera: Aphididdae) is a major pest causing up to 100% yield losses. Aiming at establishing alternative approach to synthetic insecticides, we evaluated the pathogenicity of 23 fungal isolates including Metarhizium anisopliae ((Metschn.) Sorokin; Hypocreales: Clavicipitaceae), Beauveria bassiana ((Bals...
May 19, 2018: Journal of Economic Entomology
Linan Xie, Liwen Zhang, Chen Wang, Xiaojing Wang, Ya-Ming Xu, Hefen Yu, Ping Wu, Shenglan Li, Lida Han, A A Leslie Gunatilaka, Xiaoyi Wei, Min Lin, István Molnár, Yuquan Xu
Glycosylation is a prominent strategy to optimize the pharmacokinetic and pharmacodynamic properties of drug-like small-molecule scaffolds by modulating their solubility, stability, bioavailability, and bioactivity. Glycosyltransferases applicable for "sugarcoating" various small-molecule acceptors have been isolated and characterized from plants and bacteria, but remained cryptic from filamentous fungi until recently, despite the frequent use of some fungi for whole-cell biocatalytic glycosylations...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
Ewa Kozłowska, Natalia Hoc, Jordan Sycz, Monika Urbaniak, Monika Dymarska, Jakub Grzeszczuk, Edyta Kostrzewa-Susłow, Łukasz Stępień, Elżbieta Pląskowska, Tomasz Janeczko
BACKGROUND: Steroid compounds are very interesting substrates for biotransformation due to their high biological activity and a high number of inactivated carbons which make chemical modification difficult. Microbial transformation can involve reactions which are complicated and uneconomical in chemical synthesis, and searching for a new effective biocatalyst is necessary. The best known entomopathogenic species used in steroid modification is Beauveria bassiana. In this study we tested the ability of Isaria farinosa, another entomopathogenic species, to transform several steroids...
May 12, 2018: Microbial Cell Factories
Adriano R Paula, Leila E I Silva, Anderson Ribeiro, Tariq M Butt, Carlos P Silva, Richard I Samuels
BACKGROUND: Entomopathogenic fungi are highly promising agents for controlling Aedes aegypti mosquitoes. Deploying fungus-impregnated black cloths in PET traps efficiently reduced Ae. aegypti female survival rates under intra-domicile conditions. With the aim of further increasing the effectiveness of the traps, the addition of attractive lures to fungus-impregnated traps was evaluated. METHODS: Black cloths were suspended inside 2 l plastic bottles called "PET traps"...
May 4, 2018: Parasites & Vectors
Yonghong Zhou, Pasco B Avery, Daniel Carrillo, Rita H Duncan, Alison Lukowsky, Ronald D Cave, Nemat O Keyhani
Ambrosia beetles harbor fungal symbionts that serve as food sources for larvae and adults. These beetles lay their eggs along tunnels in xylem sapwood, which is the substrate for fungal growth. Symbiotic fungi of the genus Raffaelea found in invasive and indigenous ambrosia beetles include the highly virulent plant pathogen Raffaelea lauricola affecting members of the Lauraceae family. R. lauricola is responsible for the deaths of > 500 million trees since 2005. Infection by as few as 100 spores can kill a healthy tree within months...
May 2, 2018: Applied Microbiology and Biotechnology
Qing Cai, Juan-Juan Wang, Wei Shao, Sheng-Hua Ying, Ming-Guang Feng
BACKGROUND: Rtt109 is a histone acetyltransferase that catalyzes histone H3K56 acetylation required for genomic stability, DNA damage repair and virulence-related gene activity in yeast-like human pathogens but remains functionally unknown in fungal insect pathogens. This study seeks to elucidate catalytic activity of Rtt109 orthologue and its possible role in sustaining biological control potential of Beauveria bassiana, a fungal entomopathogen. RESULTS: Deletion of rtt109 in B...
April 27, 2018: Pest Management Science
Long-Bin Zhang, Ming-Guang Feng
Filamentous fungal insect pathogens represent a source of biological insecticides and acaricides formulated using intact cells, such as conidia or other spores. These mycoinsecticides infect arthropod pests through cuticular penetration. In field application, formulated fungal cells are exposed to environmental stresses, including solar UV irradiation, high temperature, and applied chemical herbicides and fungicides, as well as stress from host immune defenses. These stresses often result in accumulation of toxic reactive oxygen species (ROS), generating oxidative stress to the fungal cells and hence affecting the efficacy and persistency of fungi formulated for pest control...
April 28, 2018: Applied Microbiology and Biotechnology
Sevasti Maistrou, Véronique Paris, Annette B Jensen, Jens Rolff, Nicolai V Meyling, Caroline Zanchi
Antimicrobial peptides have been well studied in the context of bacterial infections. Antifungal peptides have received comparatively less attention. Fungal pathogens of insects and their hosts represent a unique opportunity to study host-pathogen interactions due to the million of years of co-evolution they share. In this study, we investigated role of a constitutively expressed thaumatin-like peptide with antifungal activity expressed by the mealworm beetle Tenebrio molitor, named Tenecin 3, during a natural infection with the entomopathogenic fungus Beauveria bassiana...
April 23, 2018: Developmental and Comparative Immunology
Pasco B Avery, Verónica Bojorque, Cecilia Gámez, Rita E Duncan, Daniel Carrillo, Ronald D Cave
Laurel wilt is a disease threatening the avocado industry in Florida. The causative agent of the disease is a fungus vectored by ambrosia beetles that bore into the trees. Until recently, management strategies for the vectors of the laurel wilt fungus relied solely on chemical control and sanitation practices. Beneficial entomopathogenic fungi (EPF) are the most common and prevalent natural enemies of pathogen vectors. Laboratory experiments demonstrated that commercial strains of EPF can increase the mortality of the primary vector, Xyleborus glabratus , and potential alternative vectors, Xylosandrus crassiusculus , Xyleborus volvulus and Xyleborus bispinatus (Coleoptera: Curculionidae: Scolytinae)...
April 25, 2018: Insects
Huan Yang, Ying Zhou, Pingtian Yu, Yaya Yang, Zhaoqun Jiao, James P Tam, Yuping Shen, Xiaobin Jia
A novel PCR technology was developed to detect short DNA fragments using species-specific primers for rapid and non-sequencing authentication of Bombyx batryticatus based on differences in the mitochondrial genome. Three specifically designed primer reactions were established to target species for the reliable identification of their commercial products. They were confirmed to have a high inter-species specificity and intra-species stability. The limit of detection was estimated as 1 ng of genomes for Beauveria bassiana and 100 pg for Bombyx mori and Metarhizium anisopliae...
April 23, 2018: Natural Product Research
Naresh Dangi, Un Taek Lim
A strain (ARP14) of the entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin was isolated from field-collected Riptortus pedestris (Fabricius) (Hemiptera: Alydidae). The lethal median concentration of the ARP14 strain was compared with that of a commercialized strain (GHA) of the same fungus against R. pedestris and its two egg parasitoids, Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae) and Gryon japonicum (Ashmead) (Hymenoptera: Platygastridae). Mortality and mycosis rates were evaluated after exposure to five concentrations of the fungus, i...
2018: PloS One
Tom W Pope, Gemma Hough, Charlotte Arbona, Harriet Roberts, Jude Bennison, John Buxton, Gill Prince, Dave Chandler
Vine weevil, also known as black vine weevil, (Otiorhynchus sulcatus) is an economically important pest affecting soft fruit and nursery stock in temperate regions. We used laboratory and polytunnel experiments to investigate a novel control system based on autodissemination of spores of an entomopathogenic fungus to populations of adult vine weevils. The fungus was applied as a conidial powder, used on its own or formulated with talc, to a simple plastic refuge for vine weevils. The potential for adult weevils to disseminate the fungus was investigated first in polytunnel experiments using fluorescent powders applied to the refuge in lieu of fungal conidia...
April 12, 2018: Journal of Invertebrate Pathology
Victoria L Rhodes, Matthew B Thomas, Kristin Michel
The Toll pathway is a central regulator of antifungal immunity in insects. In mosquitoes, the Toll pathway affects infections with the fungal entomopathogen, Beauveria bassiana, which is considered a potential mosquito biopesticide. We report here the use of B. bassiana strain I93-825 in Anopheles gambiae to analyze the impact of Toll pathway modulation on mosquito survival. Exposure to a narrow dose range of conidia by direct contact decreased mosquito longevity and median survival. In addition, fungal exposure dose correlated positively and linearly with hazard ratio...
April 9, 2018: Developmental and Comparative Immunology
Bamisope S Bamisile, Chandra K Dash, Komivi S Akutse, Ravindran Keppanan, Liande Wang
The incorporation of entomopathogenic fungi as biocontrol agents into Integrated Pest Management (IPM) programs without doubt, has been highly effective. The ability of these fungal pathogens such as Beauveria bassiana and Metarhizium anisopliae to exist as endophytes in plants and protect their colonized host plants against the primary herbivore pests has widely been reported. Aside this sole role of pest management that has been traditionally ascribed to fungal endophytes, recent findings provided evidence of other possible functions as plant yield promoter, soil nutrient distributor, abiotic stress and drought tolerance enhancer in plants...
2018: Frontiers in Microbiology
Jovana Sadlova, Miroslav Homola, Jitka Myskova, Magda Jancarova, Petr Volf
BACKGROUND: The peritrophic matrix (PM) is an acellular chitin-containing envelope which in most blood sucking insects encloses the ingested blood meal and protects the midgut epithelium. Type I PM present in sand flies and other blood sucking batch feeders is secreted around the meal by the entire midgut in response to feeding. Here we tested the hypothesis that in Sergentomyia schwetzi the PM creates a physical barrier that prevents escape of Leishmania parasites from the endoperitrophic space...
April 4, 2018: PLoS Neglected Tropical Diseases
Melissa Anne Johnson, Robert Hollingsworth, Samuel Fortna, Luis F Aristizábal, Nicholas C Manoukis
Coffee berry borer (CBB) is the most devastating insect pest for coffee crops worldwide. We developed a scientific monitoring protocol that is aimed at capturing and quantifying the dynamics and impact of this invasive insect pest as well as the development of its host plant across a heterogeneous landscape. The cornerstone of this comprehensive monitoring system is timely georeferenced data collection on CBB movement, coffee berry infestation, mortality by the fungus Beauveria bassiana, and coffee plant phenology via a mobile electronic data recording application...
March 19, 2018: Journal of Visualized Experiments: JoVE
Nicolai V Meyling, Samuel Arthur, Kathrine E Pedersen, Suraj Dhakal, Nina Cedergreen, Brian L Fredensborg
BACKGROUND: Combining low doses of chemical insecticides with entomopathogens constitutes a sustainable pest control method, but significance of timing and sequence of exposures needs clarification. We studied lethal effects of combinations of the entomopathogenic fungus Beauveria bassiana (KVL03-122) and the pyrethroid alpha-cypermethrin on the beetle Tenebrio molitor under varying timing and sequence of exposure. Synergy over time was evaluated in relation to the model of Independent Action (IA)...
March 30, 2018: Pest Management Science
María G Serna-Domínguez, Gilda Y Andrade-Michel, Hugo C Arredondo-Bernal, Gallou Adrien
Conventional and commercial methods for isolation of nucleic acids are available for fungal samples including entomopathogenic fungi (EPF). However, there is not a unique optimal method for all organisms. The cell wall structure and the wide range of secondary metabolites of EPF can broadly interfere with the efficiency of the DNA extraction protocol. This study compares three commercial protocols: DNeasy® Plant Mini Kit (Qiagen), Wizard® Genomic DNA Purification Kit (Promega), and Axygen™ Multisource Genomic DNA Miniprep Kit (Axygen) and three conventional methods based on different buffers: SDS, CTAB/PVPP, and CTAB/β-mercaptoethanol versus three cell lysis procedures: liquid nitrogen homogenization and two bead-beating materials (i...
March 26, 2018: Journal of Microbiological Methods
Susanna Tall, Nicolai V Meyling
Cultivation of crops requires nutrient supplements which are costly and impact the environment. Furthermore, global demands for increased crop production call for sustainable solutions to increase yield and utilize resources such as nutrients more effectively. Some entomopathogenic fungi are able to promote plant growth, but studies over such effects have been conducted under optimal conditions where nutrients are abundantly available. We studied the effects of Beauveria bassiana (strain GHA) seed treatment on the growth of maize (Zea mays) at high and low nutrient conditions during 6 weeks in greenhouse...
March 28, 2018: Microbial Ecology
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