The bacterial flora of the midgut of two Danish populations of healthy fifth instar larvae of the turnip moth, Scotia segetum |
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Authors: | R Charpentier B Charpentier O Zethner |
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Institution: | 1. Zoological Institute, University of Lund, S-223 62 Lund, Sweden;2. Royal Veterinary and Agricultural University, DK-1870 København V, Denmark |
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Abstract: | Examination of the midgut bacteria of two Danish populations of healthy fifth instar turnip moth larvae, Scotia (=Agrotis) segetum, living on potatoes and celery gave the following results. The total number of living microorganisms in the midgut varied between 1.0 × 104 and 4.0 × 105. Larvae from celery in N. W. Zeeland always contained Streptococcus faecalis and six members of Enterobacteriaceae, viz., Citrobacter freundii, Klebsiella pneumoniae, Hafnia alvei, Proteus mirabilis, P. vulgaris, and Erwinia amylovora. In larvae from potatoes in E. Jutland, the species consistently present were Streptococcus faecalis and four species of Enterobacteriaceae, viz., Escherichia coli, Erwinia amylovora, E. carotovora var. atroseptica, and one other, probably a member of the E. carotovora group. Streptococcus faecalis is supposed to occur as a mutualist in the alimentary tract, suppressing Gram-positive bacteria. |
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Keywords: | Citrobacter freundii Klebsiella pneumoniae Hafnia alvei Proteus mirabilis Proteus vulgaris Erwinia amylovora Escherichia coli midgut |
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