Characterization of a Germination-Accelerating Factor from the Silkworm (<I>Bombyx mori</I> Linnaeus) of Entomopathogenic Fungus <I>Nomuraea rileyi</I> (Farlow) Samson

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  • NODA Takahiro
    Kumamoto Prefectural Agriculture Research Center Department of Bioscience, School of Agriculture, Tokai University
  • ONO Masateru
    Department of Bioscience, School of Agriculture, Tokai University
  • IIMURE Kazuhiko
    Kumamoto Prefectural Agriculture Research Center
  • ARAKI Tomohiro
    Department of Bioscience, School of Agriculture, Tokai University

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  • Characterization of a germination-accelerating factor from the silkworm (Bombyx mori Linnaeus) of entomopathogenic fungus Nomuraea rileyi (Farlow) samson

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Abstract

The conidium of the entomopathogenic fungus, Nomuraea rileyi, has been found to germinate rapidly in the presence of a host insect-derived extract. This extract therefore appears to contain an important factor involved in host recognition by N. rileyi, although the substance (germination-accelerating factor, GAF) responsible for such unique germination behavior has yet to be identified. Our previous study was extended to the isolation of GAF from pupae of the silkworm, a host insect of N. rileyi. This present work subjects GAF to a structural analysis. The chemical structure of GAF is characterized as 2S-amino-tetradeca-4-ene-1,3R-diol (D-erythro-C14-sphingosine) based on spectroscopic data. An examination of the structure-activity relationship shows that the activity of D-erythro-C14-sphingosine was superior to that of sphingosines with shorter and longer carbon chains. It is suggested that the molecular species with a 14-carbon chain of a sphingosine is important for host recognition.

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