scholarly journals The Toxins of Beauveria bassiana and the Strategies to Improve Their Virulence to Insects

2021 ◽  
Vol 12 ◽  
Author(s):  
Haiyang Wang ◽  
Hui Peng ◽  
Wenjuan Li ◽  
Peng Cheng ◽  
Maoqing Gong
Keyword(s):  
Immune System ◽  
Bacillus Thuringiensis ◽  
Secondary Metabolites ◽  
Oxalic Acid ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Future Perspective ◽  
Host Insect ◽  
Wide Range

The long-term and excessive usage of pesticides is an enormous burden on the environment, which also increases pest resistance. To overcome this problem, research and application of entomopathogenic fungi, which are both environmentally friendly and cause lower resistance, have gained great momentum. Entomopathogenic fungi have a wide range of prospects. Apart from Bacillus thuringiensis, Beauveria bassiana is the most studied biopesticide. After invading insect hosts, B. bassiana produces a variety of toxins, which are secondary metabolites such as beauvericin, bassianin, bassianolide, beauverolides, tenellin, oosporein, and oxalic acid. These toxins help B. bassiana to parasitize and kill the hosts. This review unequivocally considers beauveria toxins highly promising and summarizes their attack mechanism(s) on the host insect immune system. Genetic engineering strategies to improve toxin principles, genes, or virulent molecules of B. bassiana have also been discussed. Lastly, we discuss the future perspective of Beauveria toxin research, including newly discovered toxins.

Different strategies to kill the host presented byMetarhizium anisopliaeandBeauveria bassiana

2018 ◽  
Vol 64 (3) ◽  
pp. 191-200 ◽  
Author(s):  
Cynthia Barbosa Rustiguel ◽  
María Fernández-Bravo ◽  
Luis Henrique Souza Guimarães ◽  
Enrique Quesada-Moraga
Keyword(s):  
Secondary Metabolites ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Metarhizium Anisopliae ◽  
Galleria Mellonella ◽  
Insect Pests ◽  
Fungal Growth ◽  
Growth Strategy

Studies conducted over the last decades have shown the potential of entomopathogenic fungi for the biocontrol of some insect pests. Entomopathogenic fungi infect their host through the cuticle, so they do not need to be ingested to be effective. These fungi also secrete secondary metabolites and proteins that are toxic to insect pests. In this context, we analyzed the pathogenicity of Metarhizium anisopliae (Metschn.) strains IBCB 384 and IBCB 425 and Beauveria bassiana (Bals.-Criv.) Vuill. strains E 1764 and E 3158 against Galleria mellonella (Linn.) larvae, during pre-invasion and post-invasion phases. The results showed M. anisopliae, especially strain IBCB 384, was most virulent in the pre-invasion phase against G. mellonella, whereas B. bassiana, especially strain E 1764, was most virulent in the post-invasion phase. During in vivo development and in the production of toxic serum, B. bassiana E 3158 was the most virulent. Different fungal growth (or toxin) strategies were observed for studied strains. Metarhizium anisopliae IBCB 425 prioritizes the growth strategy, whereas strain IBCB 384 and B. bassiana strains E 1764 and E 3158 have a toxic strategy. All strains have pathogenicity against G. mellonella, indicating their possible use for biocontrol.

scholarly journals Entomopathogenic Fungi and Bacteria in a Veterinary Perspective

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 479
Author(s):  
Valentina Virginia Ebani ◽  
Francesca Mancianti
Keyword(s):  
Biological Activity ◽  
Bacillus Thuringiensis ◽  
Human Health ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Metarhizium Anisopliae ◽  
Field Application ◽  
Farm Animals ◽  
Dermanyssus Gallinae ◽  
Alternative Drugs

The present study aimed to review the papers dealing with the biological activity of fungi and bacteria against some mites and ticks of veterinary interest. In particular, the attention was turned to the research regarding acarid species, Dermanyssus gallinae and Psoroptes sp., which are the cause of severe threat in farm animals and, regarding ticks, also pets. Their impact on animal and human health has been stressed, examining the weaknesses and strengths of conventional treatments. Bacillus thuringiensis, Beauveria bassiana and Metarhizium anisopliae are the most widely employed agents. Their activities have been reviewed, considering the feasibility of an in-field application and the effectiveness of the administration alone or combined with conventional and alternative drugs is reported.

scholarly journals Molecular Analysis of Hypervirulent Somatic Hybrids of the Entomopathogenic Fungi Beauveria bassiana andBeauveria sulfurescens

1998 ◽  
Vol 64 (1) ◽  
pp. 88-93 ◽  
Author(s):  
Muriel Viaud ◽  
Yvonne Couteaudier ◽  
Guy Riba
Keyword(s):  
Molecular Marker ◽  
Protoplast Fusion ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Genetic Improvement ◽  
Somatic Hybridization ◽  
Somatic Hybrids ◽  
Molecular Structures ◽  
Toxic Activity ◽  
Host Insect

ABSTRACT Protoplast fusion of diauxotrophic mutants of a Beauveria bassiana entomopathogenic strain (Bb28) and a Beauveria sulfurescens toxinogenic strain (Bs2) produced hybrids which were significantly different from the parents in pathogenicity. Some of the hybrids were hypervirulent and killed insects more quickly than the Bb28 strain, probably because these hybrids had acquired the toxic activity of the Bs2 strain. By using six nuclear genes and a telomeric fingerprint probe, the molecular structures of the hybrids were studied. The results demonstrated the occurrence of parasexual events. Hybrids appeared to be diploid or aneuploid, with portions of the genome being heterozygous. A mitochondrial molecular marker indicated homoplasmy of the hybrids and inheritance of mitochondria from strain Bs2 or Bb28. The pathogenicities and the ploidies of the hybrids remained stable after passage through the host insect, showing that somatic hybridization provides an attractive method for the genetic improvement of biocontrol efficiency in the genus Beauveria.

scholarly journals Secondary Metabolites and the Risks of Isaria fumosorosea and Isaria farinosa

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 664 ◽  
Author(s):  
Qunfang Weng ◽  
Xiaofeng Zhang ◽  
Wei Chen ◽  
Qiongbo Hu
Keyword(s):  
Secondary Metabolites ◽  
Oxalic Acid ◽  
Entomopathogenic Fungi ◽  
Dipicolinic Acid ◽  
Isaria Fumosorosea ◽  
Isaria Farinosa ◽  
Worldwide Distribution ◽  
Safety Risks ◽  
Limited Possibility ◽  
Non Ribosomal Peptides

Isaria fumosorosea and Isaria farinosa are important entomopathogenic fungi with a worldwide distribution and multiple host insects. However, the concerns about the safety risks of myco-pesticides have been attracting the attention of researchers and consumers. Secondary metabolites (SMs), especially the mycotoxins, closely affect the biosafety of Isaria myco-insecticides. In the last forty years, more than seventy SMs were identified and isolated from I. fumosorosea and I. farinose. The SMs of I. fumosorosea include the mycotoxins of non-ribosomal peptides (NRPs) (beauvericin and beauverolides), terpenes (trichocaranes and fumosorinone), lactone compounds (cepharosporolides), acids (dipicolinic acid and oxalic acid), etc. Meanwhile, the NRP mycotoxins (cycloaspeptides) and the terpene compounds (farinosones and militarinones) are the main SMs in I. farinosa. Although several researches reported the two Isaria have promised biosafety, the bioactivities and the safety risks of their SMs have not been studied in detail so far. However, based on existing knowledge, most SMs (i.e., mycotoxins) do not come from Isaria myco-insecticide itself, but are from the host insects infected by Isaria fungi, because only the hosts can provide the conditions for fungal proliferation. Furthermore, the SMs from Isaria fungi have a very limited possibility of entering into environments because many SMs are decomposed in insect cadavers. The biosafety of Isaria myco-insecticides and their SMs/mycotoxins are being monitored. Of course, SMs safety risks of Isaria myco-insecticides need further research.

scholarly journals Effect of entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae, on Thrips tabaci Lindeman (Thysanoptera: Thripidae) populations in different onion cultivars

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Quratul Ain ◽  
Ata Ul Mohsin ◽  
Muhammad Naeem ◽  
Ghulam Shabbir
Keyword(s):  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Metarhizium Anisopliae ◽  
Thrips Tabaci ◽  
Field Conditions ◽  
Spray Application ◽  
Offspring Production ◽  
Population Reduction ◽  
Thrips Population

Abstract Background Thrips tabaci Lindeman (Thysanoptera: Thripidae) is the key pest of onions that causes economic yield losses in commercial onion production in Pakistan. In this study, potential of the entomopathogenic fungi (EPF), Beauveria bassiana and Metarhizium anisopliae, as a bio agent was evaluated to manage buildup of thrips population on onion crop. Results Efficacy tests for EPF were conducted against T. tabaci infesting 3 different onion varieties (Phulkara, Swat 1, and Virio 7). Commercial formulations of B. bassiana strain GHA and M. anisopilae strain ESC-1, were evaluated at 4 different concentrations (108, 109, 1010, and 1011 conidia/ml) under field conditions for 2 years. The efficacy was assessed 3, 5, 7, and 10 days after spray application of the whole onion plant. Efficacy expressed as T. tabaci (nymphs and adults) percent population reduction in comparison to controls. Maximum corrected percent population reduction was observed in onion plants treated with B. bassiana 1011 conidia/ml, i.e., 86.62, 84.59, and 86% in Phulkara, Swat 1, and Virio 7 onion varieties respectively, after 10 days of spray application. While onion plants treated with M. anisopliae 108 conidia/ml showed minimum corrected percent population reduction, i.e., 69.42, 68.45, and 69.11% in Phulkara, Swat 1, and Virio 7 onion varieties respectively, after 10 days of spray. Conclusions Beauveria bassiana could significantly reduce thrips population and could provide a better long-term management of T. tabaci on onion. B. bassiana had a high toxic effect against offspring production of the T. tabaci under field conditions than M. anisopliae.

scholarly journals Morphofunctional Changes in Peripheral Immune Organs in Space Flight and Weightlessness Modeling

2021 ◽  
Vol 10 (4) ◽  
pp. 56-67
Author(s):  
A. A. Kordenko ◽  
V. V. Shishkina ◽  
A. N. Kordenko ◽  
D. A. Atyakshin ◽  
D. A. Sokolov ◽  
...  
Keyword(s):  
Immune System ◽  
Space Flight ◽  
The State ◽  
The Body ◽  
Prolonged Stay ◽  
Space Flights ◽  
Wide Range ◽  
Functional Zones ◽  
Microgravity Conditions

Currently, there are many studies devoted to the problems of immunity in space flights. It has been proven that both short-term and long-term stay in space significantly reduces the immune function of the body. There are cases of the development of infectious diseases in astronauts during the flight, there is evidence of an increase in the activity of viruses and microorganisms that can affect the health of crew members. In the light of the upcoming expedition to Mars, it is especially important to study exactly what changes in the immune system can be triggered by prolonged stay in zero gravity and other factors of space flight and what preventive measures can help preserve the health of astronauts both during the flight itself and after its completion. The state of the immune system in space has been studied at various levels, from molecular to organ. There was a change in the morphological parameters of the immune system organs, violations of the ratio of their morpho-functional zones, and cellular composition. Various disorders in signaling pathways of differentiation, activation and death of immune system cells are shown. One of the most studied topics is the decrease in the activity of T-lymphocytes recorded by many researchers, however, even in this matter, the mechanisms of the violations occurring and their connection with the conditions of space flight have not been fully clarified. The relevance of methods for modeling microgravity conditions, such as various types of hanging, rotation on a clinostat, and immobilization is due both to their greater availability for research compared to space flights, and the importance of studying the role of various factors associated with flight in changes occurring in the human and animal bodies. This article presents an overview of publications devoted to a wide range of issues related to the state of the immune system in space flights and ground simulation conditions and attempts to combine the results of various levels of research – molecular, cellular and morphological.

Modern prevention and active longevity programs on the basis of disruptive domestic technologies: positive experience and prospects for application

2020 ◽  
pp. 66-73
Author(s):  
A. Simonova ◽  
S. Chudakov ◽  
R. Gorenkov ◽  
V. Egorov ◽  
A. Gostry ◽  
...  
Keyword(s):  
Personalized Medicine ◽  
Early Detection ◽  
Laboratory Diagnostics ◽  
Positive Experience ◽  
Practical Application ◽  
Wide Range ◽  
Integrated Program ◽  
Long Term Experience ◽  
Early Detection And Prevention

The article summarizes the long-term experience of practical application of domestic breakthrough technologies of preventive personalized medicine for laboratory diagnostics of a wide range of socially significant non-infectious diseases. Conceptual approaches to the formation of an integrated program for early detection and prevention of civilization diseases based on these technologies are given. A vision of the prospects for the development of this area in domestic and foreign medicine has been formed.

UJI IMUNOSTIMULATOR DARI KOMBINASI EKSTRAK ETANOL HERBA BINARA (ARTEMISIA VULGARIS LINN) DAN EKSTRAK ETANOL DAUN PUCUK MERAH (SYZYGIUM OLEANA) DENGAN METODE HIPERSENSITIVITAS TIPE LAMBAT PADA TIKUS JANTAN

2019 ◽  
Vol 1 (2) ◽  
pp. 22-26
Author(s):  
Romauli Anna Teresia Marbun ◽  
Aminah Syarifuddin ◽  
Montysory Silalahi ◽  
Radika Bella Fista Ginting
Keyword(s):  
Antioxidant Activity ◽  
Immune System ◽  
Secondary Metabolites ◽  
Ethanol Extract ◽  
Positive Control ◽  
Artemisia Vulgaris ◽  
Chemical Screening ◽  
Chemical Content ◽  
High Antioxidant Activity ◽  
New Treatments

Diseases mediated by the immune system are difficult problems to treat such as human immunodeficiency virus (HIV) and other lethal viruses. Infections that occur in normal people are generally brief and rarely leave permanent damage. Treatment of this disease requires an aggressive and innovative approach to the development of new treatments so that it requires the role of immunomodulators to improve the immune system. A substance that acts as an enhancer or immune enhancer can be obtained by using herbs that are efficacious as immunostimulants. One of the herbs used is herbal binara (Artemisia vulgaris L) which has been studied as a potential immunomodulator with high antioxidant activity. Previous research also stated that red shoots (Syzygium oleana) were studied as potential immunomodulators with high antioxidant activity. Several other species such as Syzygium samarangense have 16 flavonoida compounds which show pharmacological immunological activity. The purpose of this study was to determine the content of secondary metabolites of ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) and to determine the best dose of extract from the ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) can reduce the volume of swelling of mouse feet. Examination of the chemical content of secondary metabolites from the ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) is carried out by chemical screening and characterization of simplicia and extract. The method used is the slow type hypersensitivity method. In this test the independent variable is the secondary metabolite of ethanol extract of herb binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) with four concentrations (50, 100, 200 and 400 mg / kgBB). The positive control used by Stimuno dose is 32.5 mg / kgBB

To the 70th anniversary of World Meteorological Organization. Scientific and technical cooperation of Hydrometeorological Center of the USSR/Russia in the Programs of World Meteorological Organization

2020 ◽  
pp. 117-138
Author(s):  
S.V. Borshch ◽  
◽  
R.M. Vil’fand ◽  
D.B. Kiktev ◽  
V.M. Khan ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
High Efficiency ◽  
World Meteorological Organization ◽  
70Th Anniversary ◽  
Technical Level ◽  
Technical Cooperation ◽  
Wide Range

The paper presents the summary and results of long-term and multi-faceted experience of international scientific and technical cooperation of Hydrometeorological Center of Russia in the field of hydrometeorology and environmental monitoring within the framework of WMO programs, which indicates its high efficiency in performing a wide range of works at a high scientific and technical level. Keywords: World Meteorological Organization, major WMO programs, representatives of Hydrometeorological Center of Russia in WMO

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