Ultrastructural changes in the gut and the Malpighian tubules of Epilachna varivestis after application of the new antibiotic Nikkomycin involve an osmoregulatory defect |
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Authors: | Ulrich Schlüter Hartwig Holst Kurt Chr. Rönnau |
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Affiliation: | 1. Institut für Allgemeine und Spezielle Zoologie, Justus-Liebig-Universität Giessen, Federal Republic of Germany;2. Institut für Phytopathologie und Angewandte Zoologie, Justus-Liebig-Universität Giessen, Federal Republic of Germany |
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Abstract: | The effect of the antibiotic Nikkomycin was investigated on the Malpighian tubules and the gut of fourth-instar larvae of the Mexican bean beetle, Epilachna varivestis. Within the Malpighian tubules, three different stages in cell alterations can be recognized. A stage of increased activity (Stage A), and two stages of dedifferentiation (Stages B and C) which are distinguishible by characteristic mitochondrial morphology. In Stage C individuals, when Malpighian tubule function stops entirely, alterations in the midgut take place, that are signs of increased activity. Measurements of hemolymph osmotic pressure showed that there is a considerable increase to a higher level which is maintained. Compared with the ultrastructural data, the regulation of osmotic pressure on a higher level may, in part, be the result of compensation for the failure of Malpighian tubule function by the midgut. |
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Keywords: | malpighian tubules nikkomycin antibiotic osmoregulation mitochondrial morphology |
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