Histological changes accompanying the growth of the mid-intestine of Japanese beetle larvae (Popillia japonica Newman)

✍ Scribed by Daniel Ludwig; W. Fulton Abercrombie

• Book ID: 102903368
• Publisher: John Wiley and Sons
• Year: 1936
• Tongue: English
• Weight: 520 KB
• Volume: 59
• Category: Article
• ISSN: 0362-2525
• DOI: 10.1002/jmor.1050590106

✦ Synopsis

Abstract

A study was made of the changes in the mid‐intestinal epithelium accompanying the growth of first and scond instar Japanese beetle larvae. The columnar cells were counted and measured in the region limited by the second and third rings of gastric caeca.

During the first 4 days of each instar (at 25°C.), there is no increase in the number of columnar cells, growth being due entirely to an increase in the size of cells already present. The number of columnar cells begins to increase about the fifth day of each instar and continues to increase until the larva prepares for the succeeding molt. New columnar cells are produced by divisions of the basal or interstitial cells and their transformation into columnar cells. The new cells become elongated and push between adjacent columnar cells. They continue to grow until they have reached the size of columnar cells already present. Cell multiplication and differentiation occur simultaneously, and most rapidly near the end of each instar.