Abstract
1. 1. Larvae of the tu w mutant strain of Drosophila melanogaster develop melanotic masses in the caudal fatbody shortly before pupation. These abnormal tissue masses are aggregations of lamellocyte variants of the blood cells which encapsulate the caudal fat cells. 2. 2. When glucosamine-HCl is fed to second instar tu w larvae, small free-floating melanotic bodies appear, while very few of the larvae show the characteristic compact melanotic masses in the caudal fat region. The small free-floating melanotic bodies are individual fat cells from the caudal fat which have lamellocytes adhering on their surfaces. 3. 3. After the tu w larvae with the small melanotic bodies are returned to normal feeding conditions without glucosamine-HCl, a reaggregation of the free-floating melanotic bodies occurs through a process of reencapsulation by lamellocytes. 4. 4. Addition of glucosamine-HCl to the diet of Drosophila larvae of the tu w strain interferes with the adhesive properties of the lamellocytes. It has been suggested that alterations in the adhesive properties of the body cells might explain the phenocopic effect previously reported for glucosamine-HCl.
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