Cytodifferentiation in the accessory glands of Tenebrio molitor. X. Ultrastructure of the tubular gland in the male pupa

Authors

  • George M. Happ,

    Corresponding author
    1. Department of Zoology, University of Vermont, Burlington, Vermont 05405
    • Department of Zoology, University of Vermont, Burlington, Vermont 05405
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  • Christine M. Happ

    1. Department of Zoology, University of Vermont, Burlington, Vermont 05405
    2. Department of Zoology and Entomology, Colorado State University, Fort Collins, Colorado 80523
    Current affiliation:
    1. Department of Physiology and Biophysics, Colorado State University, Fort Collins, CO 80523
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Abstract

The tubular accessory gland consists of a simple secretory epithelium surrounded by a muscular coat. Over the pupal instar, the gland increases ten-fold in volume and 15-fold in length. Pupal development is divisible into a phase of mitosis and one of cell growth. During the mitotic phase, cytoplasmic membranes are sparse and nuclei move toward the luminal face of the epithelium to undergo division. In the cell growth phase, the cells become more columnar, a few stacks of rough endoplasmic reticulum are formed, and small dense secretory vesicles appear near the apical surface. The hormonal control of the developmental sequence is discussed.

Ancillary