the european corn borer (ecb) is one of the most important insect pests of corn and some other crops such as rice in iran. this pest is one of the most important hosts of the entomopathogenic fungus beauveria bassiana, a well known fungal entomopathogen with high host range and considerable potential in insect pest control. in an isolate selection program of fungal isolates against ecb, ten iso...

entomopathogenic fungi produce secondary metabolites which may bioactively help fungus in its virulence toward insect hosts. beauveria bassiana produces several toxic low molecular compounds in vitro as well as in vivo, the most important of them is beauvericin. the beh isolate of the fungus was selected for beauvericin assay. beauvericin was obtained from surface and submerged cultures of the ...

The enzymatic formation of the cyclodepsipeptide beauvericin was demonstrated in cell-free extracts from Beauveria bassiana. In analogy to the enniatin synthetase system formation of beauvericin is strictly dependent on the presence of the constituent amino and hydroxy acid, S-adenosylmethionine, and ATP/Mg2+. Synthesizing activity could be enriched about 12-fold by fractional ammonium sulfate ...

The title compound, C(19)H(28)O(4), was prepared from DHEA (dehydro-epiandrosterone) by its biotransformation using whole cells of the filamentous fungus Beauveria bassiana. The asymmetric unit contains two mol-ecules. The lactone ring is trans-positioned to the neighboring six-membered ring. In the crystal structure, O-H⋯O hydrogen bonds form layers, which are linked to each other by O-H⋯O and...

Entomopathogenic fungi are naturally occurring pathogens of some insects that produce enzymes capable of penetrating into an insect’s cuticle. Chitinases are thought to be responsible for entomopathogenic fungi’s ability to degrade cuticle. Primers were designed for the chi3 gene which encodes a chitinase CHIT30, from the mRNA transcript present in Metarhizium anisopliae. These primers were una...

Several pathogenic microorganisms have been used to investigate the genome-wide transcriptional responses of Bombyx mori to infection. However, studies have so far each focused on one microorganism, and systematic genome-wide comparison of transcriptional responses to different pathogenic microorganisms has not been undertaken. Here, we surveyed transcriptional responses of B. mori to its natur...

The entomopathogenic fungus Beauveria bassiana has a wide host range and is used as a biocontrol agent against arthropod pests. Mycoviruses have been described in phytopathogenic fungi while in entomopathogenic fungi their presence has been reported only rarely. Here we show that 21.3% of a collection of B. bassiana isolates sourced from worldwide locations, harbor dsRNA elements. Molecular cha...

This study was carried out to evaluate the influence of temperature and poultry litter on germination vegetative growth virulence and conidial production of Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) isolates on larvae and adults of the lesser mealworm (Alphitobius diaperinus) (Panzer). The vegetative growth and conidial production were evaluated on culture media. Vi...