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Free Content Effects of Cadmium on Protocerebral Neurosecretory Neurons and Fitness Components in Lymantria dispar L.

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Changes in fitness components including larval stage duration, relative growth rate (RGR), and mass of the gypsy moth, Lymantria dispar L. (Lepidoptera: Lymantriidae), were investigated in caterpillars fed a synthetic diet with or without a cadmium supplement (10, 30, 100, 250 μg Cd/g dry food weight). Morphometric changes of large protocerebral dorsomedial A2 neurosecretory neurons, their nuclei and the electrophoresis profiles of brain proteins were analyzed in the 4th instar gypsy moths fed the examined diets. The duration of the fourth larval instars were prolonged and RGR and body mass reduced if the caterpillars were fed diets containing high concentrations of cadmium (100 and 250 μg). The size of large A2 dorsomedial neurosecretory neurons and their nuclei were significantly higher in larvae fed the diets supplemented with 10, 100 and 250 μg Cd. A large amount of neurosecretory material appeared in dorsomedial neurosecretory neurons in larvae fed diets with 100 and 250 μg Cd. Differences in larval brain protein profiles in the region of molecular mass ranges (Mr) of 98kDa, 46kDa and 3.4-6.1 kDa were identified in the experimental groups.

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Keywords: BRAIN PROTEINS; DORSOMEDIAL NEUROSECRETORY NEURONS; GROWTH RATE; LARVAL DURATION; MASS

Document Type: Research Article

Publication date: 01 December 2009

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  • Folia biologica is an international quarterly journal that publishes papers on the broad field of experimental zoology, nuclear and chromosome research, and also ultrastructural studies. All papers are subject to peer reviews. Indexed in: ISI Master Journal List, Current Contents, Polish Scientific Journals Contents. I.F. 0.667
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