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Journal of Experimental Biology 107,49-58 (1983)
Published by Company of Biologists 1983

Patterns and Control of Neurosecretion for the Cytochromogenic Hormone in Blaberus Discoidalis Cockroaches

TIMOTHY K. HAYES ¹ and LARRY L. KEELEY ¹

¹ Texas Agricultural Experiment Station, Department of Entomology, Texas A&M University, College Station, Texas 77843, U.SA.

1. Corpora cardiaca(CC)from immature and adult Blaberus discoidalis Serville of both sexes contained approximately equal amounts of activity for the cytochromogenic hormone (CGH), a neurohormone which stimulates cytohaem synthesis in fat body mitochondria on day 4 of adult life.

2. CGH activity remained at a constant level in the CC of males during days 0 and 1 of adult life, decreased during days 2 and 3, and then returned to the original level by day 4. Female CC followed a similar pattern except that the period of low CGH activity occurred 1 day later.

3. Variations in early adult feeding patterns or in daily photoperiod did not change the secretory pattern of CGH. However, injections of juvenile hormone III stimulated a precocious release of CGH on days 0–1. Thus, CGH and juvenile hormone may function in this insect as a coordinated endocrine sequence directing metabolic maturation of the fat body during early adult life.

Key words: Neurohormones, cytochromes, insects

Submitted on September 22, 1982
Accepted on April 11, 1983