z-logo
Premium
The development and metamorphosis of the mid‐intestinal epithelium of Acanthoscelides obtectus (Say) (Coleoptera)
Author(s) -
Bushnell Ralph Judson
Publication year - 1936
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050600112
Subject(s) - biology , cytoplasm , metamorphosis , instar , epithelium , microbiology and biotechnology , larva , intestinal epithelium , cell division , regeneration (biology) , anatomy , cell , botany , biochemistry , genetics
Two sizes of cells are found in the mid‐gut epithelium of late embryos. The larger cells contain nuclei having twice the number of prochromosomes and nearly twice the volume as compared with the nuclei of the smaller cells. During each larval instar, the nuclei of the functional mid‐gut epithelium nearly double their volume and there is a corresponding increase in the amount of chromatin. It is suggested that chromosome division without nuclear division occurs in these epithelial cells during the pre‐ecdysial periods of each instar. The mid‐intestinal epithelial cells and their nuclei undergo characteristic changes during the feeding and pre‐ecdysial periods of each instar. Prochromosomes as well as cytoplasmic globules, which represent a cytoplasmic diminution process, are visible in the latter period. The regeneration cells which give rise to the pupal and mid‐gut epithelia have origin from the small embryonic mid‐gut cells and from nuclei and cytoplasm derived from the larval epithelium by means of an apparent ‘pseudoreduction’ of the large larval nuclei during the late third and fourth instars.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here