Ultrastructure of the lateral neurosecretory cells during reproductive development of Sitophilus granarius (L.) (Insecta: Coleoptera)
1972; Elsevier BV; Volume: 4; Issue: 3 Linguagem: Inglês
10.1016/s0040-8166(72)80020-x
ISSN1532-3072
AutoresJohnny B. Sandifer, Averett S. Tombes,
Tópico(s)Neurobiology and Insect Physiology Research
ResumoThis study describes the fine structure of the lateral neurosecretory cells in the brain of the female granary weevil Sirophilus granarius (L.) and determines whether any morphological change occurs which could be correlated with normal reproductive development. The lateral cells of five groups of adult weevils were examined: zero-day-old virgin females, seven-day-old virgin and mated females, and fourteen-day-old virgin and mated females. Seven large neurosecretory cells (LNC I) and two to four small, putative neurosecretory cells (LNC II) were found in the lateral region of each lobe of the brain. The diameters of the elementary neurosecretory granules of the LNC I were in the range of 1000–3000 Å, while the granules in the LNC II were between 600–1300 A. The nuclear-cytoplasmic ratio, the number, size, and distribution of neurosecretory granules, and the development of the Golgi complex and endoplasmic reticulum were analyzed in order to determine whether any change occurred during the 14-day developmental period. No significant difference was detected between any of the cell groups.
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