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Glycosidases and B group vitamins produced by six yeast strains from the digestive tract of Phoracantha semipunctata larvae and their role in the insect development

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Abstract

Six strains of yeasts were isolated from P. semipunctata larval gut in order to determine their role in insects nutrition. P. semipunctata larvae possess a rich glycosidasic equipment acting on oligosaccharides, heterosides and polysaccharides which is particularly characterized by an activity on hemicellulose. The yeast strains hydrolyze oligosaccharides, heterosides and some polysaccharides, such as starch and pectin, but no activity was detected on cellulose. β-Glucosidase was secreted in the medium by all strains except one. B group vitamins were also secreted by the yeasts.

Résumé

Six souches de levures ont été isolées du tube digestif de larves de P. semipunctata afin de déterminer leur rôle dans la nutrition de l'insecte. Les larves de P. semipunctata possèdent un riche équipment enzymatique agissant sur les oligosaccharides, les hétérosides et les polysaccharides (en particulier sur les hémicelluloses). Les souches de levures hydrolysent les oligosaccharides, les hétérosides et quelques polysaccharides, tels que l'amidon et la pectine, mais on n'a détecté aucune activité sur la cellulose. Toutes les souches, sauf une, excrètent dans le milieu de la β-glucosidase. Enfin, ces levures excrètent également des vitamines du groupe B.

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Author notes

  1. Guilane Vodjdani

    Present address: Laboratoire de Biochimie CNRS, Université Paris-Sud, 92290, Chatenay - Malabry, France

Authors and Affiliations

  1. Laboratoire de Zoologie, Institut National Agronomique, 75231, Paris, France

    C. Chararas & Guilane Vodjdani

  2. section levures, Laboratoire de Mycologie associé au CNRS, 69622, Villeurbanne Cedex, France

    Marie -Claire Pignal

  3. Institut Pasteur de Lyon, 69365, Lyon Cedex 2, France

    Michèle Bourgeay-Causse

Authors
  1. C. Chararas
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  2. Marie -Claire Pignal
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  3. Guilane Vodjdani
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  4. Michèle Bourgeay-Causse
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Chararas, C., Pignal, M.C., Vodjdani, G. et al. Glycosidases and B group vitamins produced by six yeast strains from the digestive tract of Phoracantha semipunctata larvae and their role in the insect development. Mycopathologia 83, 9–15 (1983). https://doi.org/10.1007/BF00437405

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