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Monitoring the distribution of secondary metabolites produced by the entomogenous fungus Beauveria brongniartii with particular reference to oosporein

Published online by Cambridge University Press:  21 November 2000

Hermann STRASSER ,
Daniela ABENDSTEIN ,
Hermann STUPPNER  and
Tariq M. BUTT
Hermann STRASSER
Affiliation:
Institute of Microbiology, University of Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
Daniela ABENDSTEIN
Affiliation:
Institute of Microbiology, University of Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
Hermann STUPPNER
Affiliation:
Institute of Pharmacy, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria
Tariq M. BUTT
Affiliation:
School of Biological Sciences, University of Wales Swansea, Singleton Park, SA2 8PP Swansea, UK. E-mail: Hermann.Strasser@uibk.ac.at
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Abstract

Oosporein was the only major secondary metabolite produced by three commercial isolates of the entomopathogenic fungus Beauveria brongniartii in submerged cultures and on sterilised barley kernels. None of the other toxins (bassianin, beauvericin and tenellin) normally produced by Beauveria species were detected by sensitive HPLC and MS techniques. The maximum amount of oosporein produced in batch reactors was 270 mg l−1, after 4 days incubation, while that produced on sterilised barley kernels ranged between 2.0 and 3.2 mg kg−1, after 14 days incubation. The mean amount of oosporein detected in cockchafer larvae infected with B. brongniartii was 0.23 mg. Melocont®-Pilzgerste, a commercial product based on B. brongniartii, was not phytotoxic to Lepidium sativum and Phleum pratense nor were fungal metabolites detected in these indicator plants. No systemic effects of oosporein were observed in treated pasture turf maintained for several months in the greenhouse.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 10 , October 2000 , pp. 1227 - 1233
Copyright
© The British Mycological Society 2000

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