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KMID : 0364219850280030151
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Korean Journal of Zoology
1985 Volume.28 No. 3 p.151 ~ p.165
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The Morphological Study of the Midgut Epithelium during the Metamorphosis of Pine Caterpillar
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Kim Jeong-Sang
Kim Woo-Kab
Kim Chang-Hwan
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Abstract
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The morphological changes of the midgut epithelium during the metamorphosis of pine caterpillar are observed with light and electron microscope, being divided into 5 stages from the 8th instar larva to just after pupation. The midgut epithelium of 8th instar larva is composed of columnar cell, goblet cell, regenerative cell, and endocrine cell. The secretorials are arranged on the nuclear membrane in the columnar cell of the midgut epithelium in the 8th instar larva, and lysosomes are augmented in the apical portion. Cytoplasmic extrusions are observed in the apical surface of columnar cell but they have no cell organells. Nucleus, mitochondria, rER, Golgi complex, and free ribsomes are observed in the regenerative cell. Regenerative cells are differentiated into the form of goblet cell, and vacuoles are gradually increased in the cytoplasm. Just pupa stage, the materials, which appears to be mainly composed of Ca, are observed in the circular form and goblet cavity of regenerative cell are detached to lumen. As a result, it reflects the process of the degeneration of the midgut epithelium that lysosomes are gradually augmented in the columnar cell, that nuclear materials are removed to cytoplasm, and that cytoplasmic extrusions are observed in the apical surface. And though regenerative cells are differentiated into the form of the goblet cell, it is believed that goblet cavity is detached from regenerative cell to the lumen and midgut epithelium of pupa stage is formed.
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